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Stridh M, Dahlstrand U, Naumovska M, Engelsberg K, Gesslein B, Sheikh R, Merdasa A, Malmsjö M. Functional and molecular 3D mapping of angiosarcoma tumor using non-invasive laser speckle, hyperspectral, and photoacoustic imaging. Orbit 2024:1-11. [PMID: 38591750 DOI: 10.1080/01676830.2024.2331718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Accepted: 03/12/2024] [Indexed: 04/10/2024]
Abstract
PURPOSE The gold standard for skin cancer diagnosis is surgical excisional biopsy and histopathological examination. Several non-invasive diagnostic techniques exist, although they have not yet translated into clinical use. This is a proof-of-concept study to assess the possibility of imaging an angiosarcoma in the periocular area. METHODS We use laser speckle, hyperspectral, and photoacoustic imaging to monitor blood perfusion and oxygen saturation, as well as the molecular composition of the tissue. The information obtained from each imaging modality was combined in order to yield a more comprehensive picture of the function, as well as molecular composition of a rapidly growing cutaneous angiosarcoma in the periocular area. RESULTS We found an increase in perfusion coupled with a reduction in oxygen saturation in the angiosarcoma. We could also extract the molecular composition of the angiosarcoma at a depth, depicting both the oxygen saturation and highlighting the presence of connective tissue via collagen. CONCLUSIONS We demonstrate the different physiological parameters that can be obtained with the different techniques and how these can be combined to provide detailed 3D maps of the functional and molecular properties of tumors useful in preoperative assessment.
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Affiliation(s)
- Magne Stridh
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Ulf Dahlstrand
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Magdalena Naumovska
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Karl Engelsberg
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Bodil Gesslein
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Rafi Sheikh
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Aboma Merdasa
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
| | - Malin Malmsjö
- Department of Clinical Sciences Lund, Ophthalmology, Lund University, Lund, Sweden
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Arildsen MM, Thrane L, Staulund J, Eijken M, Jespersen B, Postnov D, Al-Mashhadi RH, Pedersen M. Renal cortex microperfusion evaluated by laser speckle contrast imaging in an ex vivo perfused kidney model-A proof-of-concept study. Artif Organs 2024; 48:347-355. [PMID: 37962102 DOI: 10.1111/aor.14675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 10/02/2023] [Accepted: 10/18/2023] [Indexed: 11/15/2023]
Abstract
BACKGROUND Validated quantitative biomarkers for assessment of renal graft function during normothermic machine perfusion (NMP) conditions are lacking. The aim of this project was to quantify cortex microperfusion during ex vivo kidney perfusion using laser speckle contrast imaging (LSCI), and to evaluate the sensitivity of LSCI when measuring different levels of renal perfusion. Furthermore, we aimed to introduce LSCI measurements during NMP in differentially damaged kidneys. METHODS Eleven porcine kidneys were nephrectomized and perfused ex vivo. Cortex microperfusion was simultaneously monitored using LSCI. First, a flow experiment examined the relationship between changes in delivered renal flow and corresponding changes in LSCI-derived cortex microperfusion. Second, renal cortical perfusion was reduced stepwise by introducing a microembolization model. Finally, LSCI was applied for measuring renal cortex microperfusion in kidneys exposed to minimal damage or 2 h warm ischemia (WI). RESULTS Cortex microperfusion was calculated from the LSCI-obtained data. The flow experiment resulted in relatively minor changes in cortex microperfusion compared to the pump-induced changes in total renal flow. Based on stepwise injections of microspheres, we observed different levels of cortex microperfusion that correlated with administrated microsphere dosages (r2 = 0.95-0.99). We found no difference in LSCI measured cortex microperfusion between the kidneys exposed to minimal damage (renal cortex blood flow index, rcBFI = 2090-2600) and 2 h WI (rcBFI = 2189-2540). CONCLUSIONS Based on this preliminary study, we demonstrated the feasibility of LSCI in quantifying cortex microperfusion during ex vivo perfusion. Furthermore, based on LSCI-measurements, cortical microperfusion was similar in kidneys exposed to minimal and 2 h WI.
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Affiliation(s)
| | - Lars Thrane
- Comparative Medicine Lab, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Jesper Staulund
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Marco Eijken
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Bente Jespersen
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Dmitry Postnov
- Centre for Functionally Integrative Neuroscience, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | | | - Michael Pedersen
- Comparative Medicine Lab, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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Mellinger A, Hersant J, Bourreau C, Lecoq S, Deveze E, Clere N, Henni S. Caliper, contrast enhanced-ultrasound or laser speckle contrast imaging: Techniques to follow mice melanoma growth. J Biophotonics 2024; 17:e202300439. [PMID: 38302735 DOI: 10.1002/jbio.202300439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/17/2024] [Accepted: 01/17/2024] [Indexed: 02/03/2024]
Abstract
Due to morphological characteristics, metastatic melanoma is a cancer for which vascularization is not a diagnostic criterion. Laser speckle contrast imaging (LSCI) and contrast enhanced ultrasound (CEUS) are two imaging techniques that will be explored in this study, which aims to confirm these two techniques for monitoring tumor vascularization. B16F10 cells were xenografted to C57BL/6 mice treated with anti-PD1 or 0.9% NaCl. Tumor volume was measured daily while CEUS and LSCI were performed weekly. LSCI and CEUS analyses showed a decrease in tumor perfusion in both groups of mice. Although both CEUS and LSCI are useful for measuring tumor volume, LSCI appears to be more robust and effective for monitoring tumor microcirculation. Non-invasive investigations are needed to better predict tumor vascularization: CEUS and LSCI have a good applicability in a mice model.
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Affiliation(s)
| | | | - Clara Bourreau
- Univ Angers, Inserm, CNRS, MINT, SFR ICAT, Angers, France
| | - Simon Lecoq
- Vascular Medicine, University Hospital, Angers, France
| | - Eva Deveze
- Vascular Surgery, University Hospital, Angers, France
| | - Nicolas Clere
- Univ Angers, Inserm, CNRS, MINT, SFR ICAT, Angers, France
| | - Samir Henni
- Vascular Medicine, University Hospital, Angers, France
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Zhang Y, Qi X, Li W, Wan M, Ning X, Hu J. Research on the classification of early-stage brain edema by combining intrinsic optical signal imaging and laser speckle contrast imaging. J Biophotonics 2024; 17:e202300394. [PMID: 38169143 DOI: 10.1002/jbio.202300394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/24/2023] [Accepted: 12/11/2023] [Indexed: 01/05/2024]
Abstract
The early detection and pathological classification of brain edema are very important for symptomatic treatment. The dual-optical imaging system (DOIS) consists of intrinsic optical signal imaging (IOSI) and laser speckle contrast imaging (LSCI), which can acquire cerebral hemodynamic parameters of mice in real-time, including changes of oxygenated hemoglobin concentration ( Δ C HbO 2 ), deoxyhemoglobin concentration (ΔCHbR) and relative cerebral blood flow (rCBF) within the field of view. The slope sum of Δ C HbO 2 , ΔCHbR and rCBF was proposed to classify vasogenic edema (VE) and cytotoxic edema (CE). The slope sum values in the VE and CE group remain statistically different and the classification results provide higher accuracy of more than 93% for early brain edema detection. In conclusion, the differences of hemodynamic parameters between VE and CE in the early stage were revealed and the method helps in the classification of early brain edema.
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Affiliation(s)
- Yameng Zhang
- Nanjing University of Aeronautics and Astronautics, Nanjing, China
- Nanjing Institute of Technology, Nanjing, China
| | - Xinping Qi
- Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Weitao Li
- Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Min Wan
- Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Xue Ning
- Nanjing University of Aeronautics and Astronautics, Nanjing, China
| | - Jin Hu
- Department of Neurosurgery, Huashan Hospital, Shanghai Medical College, Fudan University, Shanghai, China
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Dömer P, Helgers SOA, Meinert F, Sánchez-Porras R, Mathys C, Witt K, Vajkoczy P, Hecht N, Woitzik J. Cortical Spreading Depolarization in Moyamoya Vasculopathy: A Case Series. Stroke 2024. [PMID: 38362812 DOI: 10.1161/strokeaha.123.044873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 01/22/2024] [Indexed: 02/17/2024]
Abstract
BACKGROUND Spreading depolarization describes a near-complete electrical discharge with altered local cerebral blood flow. It is described in association with acute and chronic diseases like hemorrhagic stroke or migraine. Moyamoya vasculopathy is a chronic, progressive cerebrovascular disorder leading to cerebral hypoperfusion, hemodynamically insufficient basal collateralization, and increased cortical microvascularization. METHODS In a prospective case series, we monitored for spontaneous spreading depolarization activity by using intraoperative laser speckle imaging for real-time visualization and measurement of cortical perfusion and cerebrovascular reserve capacity during cerebral revascularization in 4 consecutive patients with moyamoya. RESULTS Spontaneous spreading depolarization occurrence was documented in a patient with moyamoya before bypass grafting. Interestingly, this patient also exhibited a marked preoperative increase in angiographic collateral vessel formation. CONCLUSIONS The spontaneous occurrence of SDs in moyamoya vasculopathy could potentially provide an explanation for localized cortical infarction and increased cortical microvascular density in these patients.
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Affiliation(s)
- Patrick Dömer
- Department of Neurosurgery, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., F.M., R.S.-P., J.W.)
- Research Center Neurosensory Science, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., C.M., K.W., J.W.)
| | - Simeon O A Helgers
- Department of Neurosurgery, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., F.M., R.S.-P., J.W.)
- Research Center Neurosensory Science, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., C.M., K.W., J.W.)
| | - Franziska Meinert
- Department of Neurosurgery, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., F.M., R.S.-P., J.W.)
| | - Renán Sánchez-Porras
- Department of Neurosurgery, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., F.M., R.S.-P., J.W.)
| | - Christian Mathys
- Research Center Neurosensory Science, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., C.M., K.W., J.W.)
- Institute of Radiology and Neuroradiology, Evangelisches Krankenhaus, Carl-von-Ossietzky University Oldenburg, Germany. (C.M.)
- Department of Diagnostic and Interventional Radiology, University Düsseldorf, Germany (C.M.)
| | - Karsten Witt
- Research Center Neurosensory Science, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., C.M., K.W., J.W.)
- Department of Neurology, Carl-von-Ossietzky University Oldenburg, Germany. (K.W.)
| | - Peter Vajkoczy
- Department of Neurosurgery, Charité-Universitätsmedizin, Germany. (P.V., N.H.)
- Center for Stroke Research Berlin, Charité-Universitätsmedizin, Germany. (P.V., N.H.)
| | - Nils Hecht
- Department of Neurosurgery, Charité-Universitätsmedizin, Germany. (P.V., N.H.)
- Center for Stroke Research Berlin, Charité-Universitätsmedizin, Germany. (P.V., N.H.)
| | - Johannes Woitzik
- Department of Neurosurgery, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., F.M., R.S.-P., J.W.)
- Research Center Neurosensory Science, Carl-von-Ossietzky University Oldenburg, Germany. (P.D., S.O.A.H., C.M., K.W., J.W.)
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Jain P, Gupta S. Enhancing blood flow prediction in multi-exposure laser speckle contrast imaging through ensemble learning with K-mean clustering. Biomed Phys Eng Express 2024; 10:025005. [PMID: 38109789 DOI: 10.1088/2057-1976/ad16c2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 12/18/2023] [Indexed: 12/20/2023]
Abstract
Purpose.Accurately visualizing and measuring blood flow is of utmost importance in maintaining optimal health and preventing the onset of various chronic diseases. One promising imaging technique that aids in visualizing perfusion in biological tissues is Multi-exposure Laser Speckle Contrast Imaging (MELSCI). MELSCI technique allows real-time quantitative measurements using multiple exposure times to obtain precise and reliable blood flow data. Additionally, the application of machine learning (ML) techniques can further enhance the accuracy of blood flow prediction in this imaging modality.Method.Our study focused on developing and evaluating Ensemble Learning ML techniques along with clustering algorithms for predicting blood flow rates in MELSCI. The effectiveness of these techniques was assessed using performance parameters, including accuracy, F1-score, precision, recall, specificity, and classification error rate.Result.Notably, the study revealed that Ensemble Learning with clustering emerged as the most accurate technique, achieving an impressive accuracy rate of 98.5%. Furthermore, it demonstrated a high recall of more than 91%, F1-score, the precision of more than 90%, higher specificity of 99%, and least classification error of 1.5%, highlighting its suitability and sustainability for flow prediction in MELSCI.Conclusion.The study's findings imply that Ensemble Learning can significantly contribute to enhancing the accuracy of blood flow prediction in MELSCI. This advancement holds substantial promise for healthcare professionals and researchers, as it facilitates improved understanding and assessment of perfusion within biological tissues, which will contribute to the maintenance of good health and prevention of chronic diseases.
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Affiliation(s)
- Pankaj Jain
- National Institute of Technology Raipur, Raipur, CG, 492010, India
| | - Saurabh Gupta
- National Institute of Technology Raipur, Raipur, CG, 492010, India
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Liu HL, Yuan Y, Han L, Bi Y, Yu WY, Yu Y. Wide dynamic range measurement of blood flow in vivo using laser speckle contrast imaging. J Biomed Opt 2024; 29:016009. [PMID: 38283936 PMCID: PMC10821768 DOI: 10.1117/1.jbo.29.1.016009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2023] [Revised: 01/04/2024] [Accepted: 01/08/2024] [Indexed: 01/30/2024]
Abstract
Significance Laser speckle contrast imaging (LSCI) is a real-time wide-field technique that is applied to visualize blood flow in biomedical applications. However, there is currently a lack of relevant research to demonstrate that it can measure velocities over a wide dynamic range (WDR), which is critical for monitoring much higher and more pulsatile blood flow in larger size myocardial vessels, such as the coronary artery bypass graft, and visualizing the spatio-temporal evolution of myocardial blood flow perfusion in cardiac surgery. Aim We aim to demonstrate that the LSCI technique enables measuring velocities over a WDR from phantom experiments to animal experiments. In addition, LSCI is preliminarily applied to imaging myocardial blood flow distribution in vivo on rabbits. Approach Phantom and animal experiments are performed to verify that the LSCI method has the ability to measure blood velocities over a wide range. Our method is also validated by transit time flow measurement, which is the gold standard for blood flow measurement in cardiac surgery. Results Our method is demonstrated to measure the blood flow over a wide range from 0.2 to 635 mm / s . To validate the phantom results, the varying blood flow rate from 0 to 320 mm / s is detected in the rat carotid artery. Additionally, our technique also obtains blood flow maps of different myocardial vessels, such as superficial large/small veins, veins surrounded by fat, and myocardial deeper arteriole. Conclusions Our study has the potential to visualize the spatio-temporal evolution of myocardial perfusion in coronary artery bypass grafting, which would be of great benefit for future research in the life sciences and clinical medicine.
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Affiliation(s)
- Hong Li Liu
- Beijing Anzhen Hospital of Capital Medical University, Department of Cardiovascular Surgery, Beijing, China
| | - Yuan Yuan
- Chinese Academy of Sciences, Technical Institute of Physics and Chemistry, Center of Applied Laser, Beijing, China
| | - Li Han
- Chinese Academy of Sciences, Technical Institute of Physics and Chemistry, Center of Applied Laser, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Yong Bi
- Chinese Academy of Sciences, Technical Institute of Physics and Chemistry, Center of Applied Laser, Beijing, China
| | - Wen Yuan Yu
- Beijing Anzhen Hospital of Capital Medical University, Department of Cardiovascular Surgery, Beijing, China
| | - Yang Yu
- Beijing Anzhen Hospital of Capital Medical University, Department of Cardiovascular Surgery, Beijing, China
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Juarez-Ramirez JC, Coyotl-Ocelotl B, Choi B, Ramos-Garcia R, Spezzia-Mazzocco T, Ramirez-San-Juan JC. Improved spatial speckle contrast model for tissue blood flow imaging: effects of spatial correlation among neighboring camera pixels. J Biomed Opt 2023; 28:125002. [PMID: 38074216 PMCID: PMC10704254 DOI: 10.1117/1.jbo.28.12.125002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 10/30/2023] [Accepted: 10/31/2023] [Indexed: 12/18/2023]
Abstract
Significance Speckle contrast analysis is the basis of laser speckle imaging (LSI), a simple, inexpensive, noninvasive technique used in various fields of medicine and engineering. A common application of LSI is the measurement of tissue blood flow. Accurate measurement of speckle contrast is essential to correctly measure blood flow. Variables, such as speckle grain size and camera pixel size, affect the speckle pattern and thus the speckle contrast. Aim We studied the effects of spatial correlation among adjacent camera pixels on the resulting speckle contrast values. Approach We derived a model that accounts for the potential correlation of intensity values in the common experimental situation where the speckle grain size is larger than the camera pixel size. In vitro phantom experiments were performed to test the model. Results Our spatial correlation model predicts that speckle contrast first increases, then decreases as the speckle grain size increases relative to the pixel size. This decreasing trend opposes what is observed with a standard speckle contrast model that does not consider spatial correlation. Experimental data are in good agreement with the predictions of our spatial correlation model. Conclusions We present a spatial correlation model that provides a more accurate measurement of speckle contrast, which should lead to improved accuracy in tissue blood flow measurements. The associated correlation factors only need to be calculated once, and open-source software is provided to assist with the calculation.
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Affiliation(s)
| | - Beatriz Coyotl-Ocelotl
- Instituto Nacional de Astrofisica, Optica y Electronica, Departamento de Optica, Tonantzintla, Mexico
| | - Bernard Choi
- University of California, Irvine, Beckman Laser Institute and Medical Clinic, Department of Surgery, Irvine, California, United States
| | - Ruben Ramos-Garcia
- Instituto Nacional de Astrofisica, Optica y Electronica, Departamento de Optica, Tonantzintla, Mexico
| | - Teresita Spezzia-Mazzocco
- Instituto Nacional de Astrofisica, Optica y Electronica, Departamento de Optica, Tonantzintla, Mexico
| | - Julio C. Ramirez-San-Juan
- Instituto Nacional de Astrofisica, Optica y Electronica, Departamento de Optica, Tonantzintla, Mexico
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Al Yacoub ON, Tarantini S, Zhang Y, Csiszar A, Standifer KM. The Nociceptin/Orphanin FQ peptide receptor antagonist, SB-612111, improves cerebral blood flow in a rat model of traumatic brain injury. Front Pharmacol 2023; 14:1272969. [PMID: 37920208 PMCID: PMC10618424 DOI: 10.3389/fphar.2023.1272969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 10/05/2023] [Indexed: 11/04/2023] Open
Abstract
Traumatic brain injury (TBI) affects more than 2.5 million people in the U.S. each year and is the leading cause of death and disability in children and adults ages 1 to 44. Approximately 90% of TBI cases are classified as mild but may still lead to acute detrimental effects such as impaired cerebral blood flow (CBF) that result in prolonged impacts on brain function and quality of life in up to 15% of patients. We previously reported that nociceptin/orphanin FQ (N/OFQ) peptide (NOP) receptor antagonism reversed mild blast TBI-induced vestibulomotor deficits and prevented hypoxia. To explore mechanisms by which the NOP receptor-N/OFQ pathway modulates hypoxia and other TBI sequelae, the ability of the NOP antagonist, SB-612111 (SB), to reverse TBI-induced CBF and associated injury marker changes were tested in this study. Male Wistar rats randomly received sham craniotomy or craniotomy + TBI via controlled cortical impact. Injury severity was assessed after 1 h (modified neurological severity score (mNSS). Changes in CBF were assessed 2 h post-injury above the exposed cortex using laser speckle contrast imaging in response to the direct application of increasing concentrations of vehicle or SB (1, 10, and 100 µM) to the brain surface. TBI increased mNSS scores compared to baseline and confirmed mild TBI (mTBI) severity. CBF was significantly impaired on the ipsilateral side of the brain following mTBI, compared to contralateral side and to sham rats. SB dose-dependently improved CBF on the ipsilateral side after mTBI compared to SB effects on the respective ipsilateral side of sham rats but had no effect on contralateral CBF or in uninjured rats. N/OFQ levels increased in the cerebral spinal fluid (CSF) following mTBI, which correlated with the percent decrease in ipsilateral CBF. TBI also activated ERK and cofilin within 3 h post-TBI; ERK activation correlated with increased CSF N/OFQ. In conclusion, this study reveals a significant contribution of the N/OFQ-NOP receptor system to TBI-induced dysregulation of cerebral vasculature and suggests that the NOP receptor should be considered as a potential therapeutic target for TBI.
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Affiliation(s)
- Omar N. Al Yacoub
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Stefano Tarantini
- Department of Neurosurgery, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Oklahoma Center for Geroscience and Healthy Brain Aging, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Stephenson Cancer Center, Oklahoma City, OK, United States
| | - Yong Zhang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Anna Csiszar
- Department of Neurosurgery, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
- Oklahoma Center for Geroscience and Healthy Brain Aging, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Kelly M. Standifer
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
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De Decker I, Klotz T, Vu P, Hoeksema H, De Mey K, Beeckman A, Vermeulen B, Speeckaert M, Blondeel P, Wagstaff M, Monstrey S, Claes KEY. Influence of Moisturizers on Skin Microcirculation: An Assessment Study Using Laser Speckle Contrast Imaging. J Pers Med 2023; 13:1507. [PMID: 37888118 PMCID: PMC10608544 DOI: 10.3390/jpm13101507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 10/13/2023] [Accepted: 10/17/2023] [Indexed: 10/28/2023] Open
Abstract
Non-invasive scar management typically involves pressure therapy, hydration with silicones or moisturizers, and UV protection. Moisture loss from scars can lead to hypertrophic scar formation. Pressure therapy reduces blood flow, fibroblast activity, and transforming growth factor beta 1 (TGF-β1) release. This study examined various moisturizers and liquid silicone gel's impact on microcirculation. 40 volunteers participated in a study where superficial abrasions were created to induce trans epidermal water loss (TEWL). Five moisturizers (TEDRA®, TEDRA® NT1, TEDRA® NT3, Alhydran®, Lipikar®) and BAP Scar Care® silicone gel were tested. TEWL, hydration, and blood flow were measured up to 4 h post-application. Results showed that silicone had the least impact on occlusion and hydration. Alhydran® reduced blood flow the most, while Lipikar® increased it the most. TEDRA® NT1 had reduced flow compared to TEDRA® and TEDRA® NT3. All TEDRA® products exhibited high hydration, and all but silicone showed good occlusion. Moisturizers influenced skin microcirculation, with some causing decrease, while others increased flow. However, the clinical impact on scarring remains unclear compared to the evident effects of hydration and occlusion. More research is necessary to study moisturizers alone and with pressure therapy on scars, along with potential adverse effects of increased microcirculation on scars.
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Affiliation(s)
- Ignace De Decker
- Burn Center, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium; (H.H.); (K.D.M.); (P.B.); (S.M.); (K.E.Y.C.)
- Department of Plastic Surgery, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Tanja Klotz
- Adelaide Medical School, The University of Adelaide, Adelaide, SA 5000, Australia; (T.K.); (M.W.)
- Department of Occupational Therapy, Royal Adelaide Hospital, Port Rd., Adelaide, SA 5000, Australia
| | - Peter Vu
- SA Pharmacy, Royal Adelaide Hospital, Adelaide, SA 5000, Australia;
| | - Henk Hoeksema
- Burn Center, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium; (H.H.); (K.D.M.); (P.B.); (S.M.); (K.E.Y.C.)
- Department of Plastic Surgery, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Kimberly De Mey
- Burn Center, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium; (H.H.); (K.D.M.); (P.B.); (S.M.); (K.E.Y.C.)
| | - Anse Beeckman
- Faculty of Medicine and Health Sciences, Sint-Pietersnieuwsstraat 33, 9000 Ghent, Belgium;
| | - Bob Vermeulen
- Department of Plastic Surgery, Ziekenhuis Oost-Limburg, Synaps Park 1, 3600 Genk, Belgium
| | - Marijn Speeckaert
- Department of Nephrology, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium;
| | - Phillip Blondeel
- Burn Center, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium; (H.H.); (K.D.M.); (P.B.); (S.M.); (K.E.Y.C.)
- Department of Plastic Surgery, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Marcus Wagstaff
- Adelaide Medical School, The University of Adelaide, Adelaide, SA 5000, Australia; (T.K.); (M.W.)
- Adult Burns Service and Department of Plastic Surgery, Royal Adelaide Hospital, Port Rd., Adelaide, SA 5000, Australia
| | - Stan Monstrey
- Burn Center, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium; (H.H.); (K.D.M.); (P.B.); (S.M.); (K.E.Y.C.)
- Department of Plastic Surgery, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium
| | - Karel E. Y. Claes
- Burn Center, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium; (H.H.); (K.D.M.); (P.B.); (S.M.); (K.E.Y.C.)
- Department of Plastic Surgery, Ghent University Hospital, C. Heymanslaan 10, 9000 Ghent, Belgium
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11
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Fang Y, van Ooijen L, Ambagtsheer G, Nikolaev AV, Clahsen-van Groningen MC, Dankelman J, de Bruin RWF, Minnee RC. Real-time laser speckle contrast imaging measurement during normothermic machine perfusion in pretransplant kidney assessment. Lasers Surg Med 2023; 55:784-793. [PMID: 37555246 DOI: 10.1002/lsm.23715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 07/31/2023] [Accepted: 07/31/2023] [Indexed: 08/10/2023]
Abstract
OBJECTIVES Normothermic machine perfusion (NMP) provides a platform for pre-transplant kidney quality assessment that is essential for the use of marginal donor kidneys. Laser speckle contrast imaging (LSCI) presents distinct advantages as a real-time and noncontact imaging technique for measuring microcirculation. In this study, we aimed to assess the value of LSCI in visualizing renal cortical perfusion and investigate the additional value of dual-side LSCI measurements compared to single aspect measurement during NMP. METHODS Porcine kidneys were obtained from a slaughterhouse and then underwent NMP. LSCI was used to measure one-sided cortical perfusion in the first 100 min of NMP. Thereafter, the inferior renal artery branch was occluded to induce partial ischemia and LSCI measurements on both ventral and dorsal sides were performed. RESULTS LSCI fluxes correlated linearly with the renal blood flow (R2 = 0.90, p < 0.001). After renal artery branch occlusion, absence of renal cortical perfusion could be visualized and semiquantified by LSCI. The overall ischemic area percentage of the ventral and dorsal sides was comparable (median interquartile range [IQR], 38 [24-43]% vs. 29 [17-46]%, p = 0.43), but heterogenous patterns between the two aspects were observed. There was a significant difference in oxygen consumption (mean ± standard deviation [SD], 2.57 ± 0.63 vs. 1.83 ± 0.49 mLO2 /min/100 g, p < 0.001), urine output (median [IQR], 1.3 [1.1-1.7] vs. 0.8 [0.6-1.3] mL/min, p < 0.05), lactate dehydrogenase (mean ± SD, 768 ± 370 vs. 905 ± 401 U/L, p < 0.05) and AST (mean ± SD, 352 ± 285 vs. 462 ± 383 U/L, p < 0.01) before and after renal artery occlusion, while no significant difference was found in creatinine clearance, fractional excretion of sodium, total sodium reabsorption and histological damage. CONCLUSIONS LSCI fluxes correlated linearly with renal blood flow during NMP. Renal cortical microcirculation and absent perfusion can be visualized and semiquantified by LSCI. It provides a relative understanding of perfusion levels, allowing for a qualitative comparison between regions in the kidney. Dual-side LSCI measurements are of added value compared to single aspect measurement and renal function markers.
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Affiliation(s)
- Yitian Fang
- Department of Surgery, Division of HPB and Transplant Surgery, Transplant Institute, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Lisanne van Ooijen
- Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands
| | - Gisela Ambagtsheer
- Department of Surgery, Division of HPB and Transplant Surgery, Transplant Institute, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Anton V Nikolaev
- Department of Cardiology, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Marian C Clahsen-van Groningen
- Department of Pathology and Clinical Bioinformatics, Erasmus Medical Center, Rotterdam, the Netherlands
- Institute of Experimental and Systems Biology, RWTH Aachen University, Aachen, Germany
| | - Jenny Dankelman
- Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands
| | - Ron W F de Bruin
- Department of Surgery, Division of HPB and Transplant Surgery, Transplant Institute, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Robert C Minnee
- Department of Surgery, Division of HPB and Transplant Surgery, Transplant Institute, Erasmus Medical Center, Rotterdam, the Netherlands
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Bian EJ, Chen CW, Cheng CM, Kuan CY, Sun YY. Impaired post-stroke collateral circulation in sickle cell anemia mice. Front Neurol 2023; 14:1215876. [PMID: 37822524 PMCID: PMC10562566 DOI: 10.3389/fneur.2023.1215876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 09/06/2023] [Indexed: 10/13/2023] Open
Abstract
Patients with sickle cell anemia (SCA) have a high incidence of ischemic stroke, but are usually excluded from thrombolytic therapy due to concerns for cerebral hemorrhage. Maladaptation to cerebral ischemia may also contribute to the stroke propensity in SCA. Here we compared post-stroke cortical collateral circulation in transgenic sickle (SS) mice, bone marrow grafting-derived SS-chimera, and wildtype (AA) controls, because collateral circulation is a critical factor for cell survival within the ischemic penumbra. Further, it has been shown that SS mice develop poorer neo-collateral perfusion after limb ischemia. We used the middle cerebral artery (MCA)-targeted photothrombosis model in this study, since it is better tolerated by SS mice and creates a clear infarct core versus peri-infarct area. Compared to AA mice, SS mice showed enlarged infarction and lesser endothelial proliferation after photothrombosis. SS-chimera showed anemia, hypoxia-induced erythrocyte sickling, and attenuated recovery of blood flow in the ipsilateral cortex after photothrombosis. In AA chimera, cerebral blood flow in the border area between MCA and the anterior cerebral artery (ACA) and posterior cerebral artery (PCA) trees improved from 44% of contralateral level after stroke to 78% at 7 d recovery. In contrast, blood flow in the MCA-ACA and MCA-PCA border areas only increased from 35 to 43% at 7 d post-stroke in SS chimera. These findings suggest deficits of post-stroke collateral circulation in SCA. Better understanding of the underpinnings may suggest novel stroke therapies for SCA patients.
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Affiliation(s)
- Emily J. Bian
- Department of Neuroscience, Center for Brain Immunology and Glia (BIG), University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Ching-Wen Chen
- Department of Immunology, Duke University School of Medicine, Durham, NC, United States
| | - Chih-Mei Cheng
- Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung City, Taiwan
- Department of Medical Research, Kaohsiung Medical University, Kaohsiung City, Taiwan
| | - Chia-Yi Kuan
- Department of Neuroscience, Center for Brain Immunology and Glia (BIG), University of Virginia School of Medicine, Charlottesville, VA, United States
| | - Yu-Yo Sun
- Department of Neuroscience, Center for Brain Immunology and Glia (BIG), University of Virginia School of Medicine, Charlottesville, VA, United States
- Institute of Biopharmaceutical Sciences, National Sun Yat-sen University, Kaohsiung City, Taiwan
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13
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Langri DS, Sunar U. Non-Invasive Continuous Optical Monitoring of Cerebral Blood Flow after Traumatic Brain Injury in Mice Using Fiber Camera-Based Speckle Contrast Optical Spectroscopy. Brain Sci 2023; 13:1365. [PMID: 37891734 PMCID: PMC10605647 DOI: 10.3390/brainsci13101365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 09/05/2023] [Accepted: 09/15/2023] [Indexed: 10/29/2023] Open
Abstract
Neurocritical care focuses on monitoring cerebral blood flow (CBF) to prevent secondary brain injuries before damage becomes irreversible. Thus, there is a critical unmet need for continuous neuromonitoring methods to quantify CBF within the vulnerable cortex continuously and non-invasively. Animal models and imaging biomarkers can provide valuable insights into the mechanisms and kinetics of head injury, as well as insights for potential treatment strategies. For this purpose, we implemented an optical technique for continuous monitoring of blood flow changes after a closed head injury in a mouse model, which is based on laser speckle contrast imaging and a fiber camera-based approach. Our results indicate a significant decrease (~10%, p-value < 0.05) in blood flow within 30 min of a closed head injury. Furthermore, the low-frequency oscillation analysis also indicated much lower power in the trauma group compared to the control group. Overall, blood flow has the potential to be a biomarker for head injuries in the early phase of a trauma, and the system is useful for continuous monitoring with the potential for clinical translation.
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Affiliation(s)
- Dharminder S. Langri
- Department of Biomedical Engineering, Wright State University, Dayton, OH 45435, USA;
| | - Ulas Sunar
- Department of Biomedical Engineering, Stony Brook University, New York, NY 11794, USA
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14
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Lin M, Zhang MJ, Fan XS, Zhang XF, Liu J, Lu GT, Chen H, Zuo G, Liu J, Zhang JC, She YF. [The skin surface microcirculation of conception vessel, governor vessel and thoroughfare vessel in patients with primary dysmenorrhea]. Zhongguo Zhen Jiu 2023; 43:1042-7. [PMID: 37697880 DOI: 10.13703/j.0255-2930.20221227-k0005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
OBJECTIVE To observe the skin surface microcirculation of acupoints of conception vessel, governor vessel and thoroughfare vessel in patients with primary dysmenorrhea using laser speckle contrast imaging (LSCI), and provide acupoint selection basis of acupuncture-moxibustion for primary dysmenorrhea. METHODS Ninety-nine healthy female college students with regular menstrual cycles (normal group) and 94 female college students with primary dysmenorrhea (dysmenorrhea group) were recruited. Before menstrual period, on the first day of menstruation, and on the third day after menstruation, LSCI was used to observe the surface microcirculation at the abdominal acupoints of conception vessel, i. e. Yinjiao (CV 7), Qihai (CV 6), Shimen (CV 5), Guanyuan (CV 4), Zhongji (CV 3) and Qugou (CV 2), acupoints of thoroughfare vessel, i. e. Huangshu (KI 16), Zhongzhu (KI 15), Siman (KI 14), Qixue (KI 13), Dahe (KI 12), Henggu (KI 11) and acupoints of lumbosacral region of governor vessel, i. e. Xuanshu (GV 5), Mingmen (GV 4), Yaoyangguan (GV 3), Yaoshu (GV 2) as well as two non-acupoints. RESULTS Before menstrual period, there was no significant difference in the surface blood perfusion of the acupoints between the dysmenorrhea group and the normal group (P>0.05). On the first day of menstruation, the surface blood perfusion of Xuanshu (GV 5), Mingmen (GV 4), Yaoyangguan (GV 3) and right Huangshu (KI 16) in the dysmenorrhea group was higher than that in the normal group (P<0.05, P<0.01). On the third day after menstruation, the surface blood perfusion of the right Henggu (KI 11) in the dysmenorrhea group was lower than that in the normal group (P<0.05). CONCLUSION In patients with primary dysmenorrhea, on the first day of menstruation, the surface blood perfusion of Xuanshu (GV 5), Mingmen (GV 4), Yaoyangguan (GV 3) of governor vessel, and the right Huangshu (KI 16) of thoroughfare vessel is increased, while on the third day after menstruation, the surface blood perfusion of the right Henggu (KI 11) of thoroughfare vessel is decreased. These findings might provide a basis for acupoint selection in the acupuncture-moxibustion treatment of primary dysmenorrhea.
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Affiliation(s)
- Miao Lin
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China
| | | | - Xi-Sheng Fan
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China; International Joint Research Center of Advantageous Diseases for Acupuncture and Moxibustion in Hebei Province, Shijiazhuang 050200
| | - Xi-Fen Zhang
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China
| | - Jin Liu
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China
| | - Guang-Tong Lu
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China
| | - Hao Chen
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China
| | - Guang Zuo
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China
| | - Jun Liu
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China; International Joint Research Center of Advantageous Diseases for Acupuncture and Moxibustion in Hebei Province, Shijiazhuang 050200
| | - Jun-Cha Zhang
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China; International Joint Research Center of Advantageous Diseases for Acupuncture and Moxibustion in Hebei Province, Shijiazhuang 050200
| | - Yan-Fen She
- College of Acupuncture-Moxibustion and Tuina, Hebei University of TCM, Shijiazhuang 050200, China; International Joint Research Center of Advantageous Diseases for Acupuncture and Moxibustion in Hebei Province, Shijiazhuang 050200
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15
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Kim Y, Choi WJ, Oh J, Lee K, Kim JK. Smartphone-Based Rigid Endoscopy Device with Hemodynamic Response Imaging and Laser Speckle Contrast Imaging. Biosensors (Basel) 2023; 13:816. [PMID: 37622902 PMCID: PMC10452712 DOI: 10.3390/bios13080816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Revised: 08/11/2023] [Accepted: 08/13/2023] [Indexed: 08/26/2023]
Abstract
Modern smartphones have been employed as key elements in point-of-care (POC) devices due to remarkable advances in their form factor, computing, and display performances. Recently, we reported a combination of the smartphone with a handheld endoscope using laser speckle contrast imaging (LSCI), suggesting potential for functional POC endoscopy. Here, we extended our work to develop a smartphone-combined multifunctional handheld endoscope using dual-wavelength LSCI. Dual-wavelength LSCI is used to monitor the changes in dynamic blood flow as well as changes in the concentration of oxygenated (HbO2), deoxygenated (Hbr), and total hemoglobin (HbT). The smartphone in the device performs fast acquisition and computation of the raw LSCI data to map the blood perfusion parameters. The flow imaging performance of the proposed device was tested with a tissue-like flow phantom, exhibiting a speckle flow index map representing the blood perfusion. Furthermore, the device was employed to assess the blood perfusion status from an exteriorized intestine model of rat in vivo during and after local ischemia, showing that blood flow and HbO2 gradually decreased in the ischemic region whereas hyperemia and excess increases in HbO2 were observed in the same region right after reperfusion. The results indicate that the combination of LSCI with smartphone endoscopy delivers a valuable platform for better understanding of the functional hemodynamic changes in the vasculatures of the internal organs, which may benefit POC testing for diagnosis and treatment of vascular diseases.
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Affiliation(s)
- Youngkyu Kim
- Biomedical Engineering Research Center, Asan Medical Center, Seoul 05505, Republic of Korea;
| | - Woo June Choi
- School of Electrical and Electronics Engineering, Chung-Ang University, Seoul 06974, Republic of Korea;
| | - Jeongmin Oh
- Department of Biomedical Engineering, College of Medicine, University of Ulsan, Seoul 05505, Republic of Korea; (J.O.); (K.L.)
| | - Kwanhee Lee
- Department of Biomedical Engineering, College of Medicine, University of Ulsan, Seoul 05505, Republic of Korea; (J.O.); (K.L.)
| | - Jun Ki Kim
- Biomedical Engineering Research Center, Asan Medical Center, Seoul 05505, Republic of Korea;
- Department of Biomedical Engineering, College of Medicine, University of Ulsan, Seoul 05505, Republic of Korea; (J.O.); (K.L.)
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Jain P, Gupta S. Multi-exposure Laser Speckle Contrast Imaging (MECI)-Based Prediction of Blood Flow Using Random Forest (RF) With K-Means (KM). Cureus 2023; 15:e40345. [PMID: 37456452 PMCID: PMC10338991 DOI: 10.7759/cureus.40345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/11/2023] [Indexed: 07/18/2023] Open
Abstract
Blood flow prediction is very important for medical diagnosis, drug development, tissue engineering, and continuous monitoring. One commonly used method for studying blood flow is called multi-exposure laser speckle contrast imaging (MECI). It provides valuable insights into how blood flows through tissues and helps in diagnosing circulatory diseases. In our study, we used MECI to measure blood flow in real-time by taking multiple measurements with different exposure times and contrasts. To predict different blood flow rates ranging from 0.1 to 1 mm/s, we employed machine learning (ML) techniques like clustering and random forest (RF) or support vector machine (SVM) algorithms. The study showed that RF with K-means performance is found to be the most accurate technique for flow classification, with an accuracy of 98.5%, a precision of 92%, a specificity of 98.9%, and a classification error of 1.5%. Our study demonstrates that employing clustering and RF algorithms in MECI provides a robust and effective approach to predicting blood flow. This technique holds great potential for a wide range of applications in the medical and healthcare fields.
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Affiliation(s)
- Pankaj Jain
- Biomedical Engineering, National Institute of Technology, Raipur, IND
| | - Saurabh Gupta
- Biomedical Engineering, National Institute of Technology, Raipur, IND
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Lazaridis A, Triantafyllou A, Mastrogiannis K, Malliora A, Doumas M, Gkaliagkousi E. ASSESSING SKIN MICROCIRCULATION IN PATIENTS AT CARDIOVASCULAR RISK BY USING LASER SPECKLE CONTRAST IMAGING. A NARRATIVE REVIEW. Clin Physiol Funct Imaging 2023. [PMID: 37020404 DOI: 10.1111/cpf.12819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 02/15/2023] [Accepted: 03/27/2023] [Indexed: 04/07/2023]
Abstract
Skin tissue holds a prominent role in microcirculatory research as an easily accessible vascular bed for the non-invasive evaluation of microvascular function. Skin microvascular changes have been associated to alterations in distinct target organs and vascular beds, reinforcing the hypothesis that skin microcirculation can be used as a model of generalized microvascular function. In addition, skin microvascular dysfunction has been documented in cardiovascular disease and patients of increased cardiovascular risk where it has been associated with multiple cardiovascular risk factors, rendering it a candidate surrogate marker of vascular damage. Laser Speckle Contrast Imaging (LSCI) is a non-invasive, dynamic laser technique that allows assessment of skin microvascular function (SMF) by obtaining two-dimensional maps of the skin perfusion in real time with high spatial and temporal resolution and, most importantly, with the highest reproducibility as compared to other laser methods. An ever-increasing number of studies using LSCI is confirming evidence of impaired SMF in several cardiovascular risk groups, therefore expanding its application in microvascular research and showing its potential clinical utility. This review attempts to present the growing importance of SMF in cardiovascular research and the emergence of LSCI technique as a robust imaging modality with a promising role to explore skin microvascular physiology. After a short description of the relevant technique and its main principle of function, we have also opted to present the most up to date studies using LSCI for the investigation of SMF in patients with cardiovascular disease as well as various groups of increased cardiovascular risk. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- A Lazaridis
- 3rd Department of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - A Triantafyllou
- 3rd Department of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - K Mastrogiannis
- 3rd Department of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - A Malliora
- 3rd Department of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - M Doumas
- 2nd Propedeutic Department of Internal Medicine, Hippokrateio Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - E Gkaliagkousi
- 3rd Department of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
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18
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Jain P, Gupta S. Blood Flow Prediction in Multi-Exposure Speckle Contrast Imaging Using Conditional Generative Adversarial Network. Cureus 2023; 15:e37349. [PMID: 37182031 PMCID: PMC10170186 DOI: 10.7759/cureus.37349] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/05/2023] [Indexed: 05/16/2023] Open
Abstract
Purpose Blood perfusion is an important physiological parameter that can be quantitatively assessed using various imaging techniques. Blood flow prediction in laser speckle contrast imaging is important for medical diagnosis, drug development, tissue engineering, biomedical research, and continuous monitoring. Deep learning is a new and promising approach for predicting blood flow whenever the condition varies, but it comes with a high learning cost for real-world scenarios with a variable flow value derived from multi-exposure laser speckle contrast imaging (MECI) data. A generative adversarial network (GAN) is presented in this research for the reliable prediction of blood flows in diverse scenarios in MECI. Method We suggested a time-efficient approach using a low frame rate camera that can be used to predict blood flow in MECI data by using conditional GAN architecture. Our approach is implemented by extending our work to the entire flow as well as the specific region of interest (ROI) in the flow. Results Results show that conditional GAN exhibits improved generalization ability to predict blood flow in MECI when compared to classifications-based deep learning approaches with an accuracy of 98.5% with a relative mean error of 1.57% for the whole field and 7.53% for a specific ROI. Conclusion The conditional GAN is very effective in predicting blood flows in MECI, entirely or within ROI, compared with other deep learning approaches.
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Affiliation(s)
- Pankaj Jain
- Biomedical Engineering, National Institute of Technology, Raipur, IND
| | - Saurabh Gupta
- Biomedical Engineering, National Institute of Technology, Raipur, IND
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19
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Chizari A, Tsong W, Knop T, Steenbergen W. Prediction of motion artifacts caused by translation in handheld laser speckle contrast imaging. J Biomed Opt 2023; 28:046005. [PMID: 37082096 PMCID: PMC10112282 DOI: 10.1117/1.jbo.28.4.046005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 03/24/2023] [Indexed: 05/03/2023]
Abstract
Significance In handheld laser speckle contrast imaging (LSCI), motion artifacts (MA) are inevitable. Suppression of MA leads to a valid and objective assessment of tissue perfusion in a wide range of medical applications including dermatology and burns. Our study shines light on the sources of these artifacts, which have not yet been explored. We propose a model based on optical Doppler effect to predict speckle contrast drop as an indication of MA. Aim We aim to theoretically model MA when an LSCI system measuring on static scattering media is subject to translational displacements. We validate the model using both simulation and experiments. This is the crucial first step toward creating robustness against MA. Approach Our model calculates optical Doppler shifts in order to predict intensity correlation function and contrast of the time-integrated intensity as functions of applied speed based on illumination and detection wavevectors. To validate the theoretical predictions, computer simulation of the dynamic speckles has been carried out. Then experiments are performed by both high-speed and low-framerate imaging. The employed samples for the experiments are a highly scattering matte surface and a Delrin plate of finite scattering level in which volume scattering occurs. Results An agreement has been found between theoretical prediction, simulation, and experimental results of both intensity correlation functions and speckle contrast. Coefficients in the proposed model have been linked to the physical parameters according to the experimental setups. Conclusions The proposed model provides a quantitative description of the influence of the types of illumination and media in the creation of MA. The accurate prediction of MA caused by translation based on Doppler shifts makes our model suitable to study the influence of rotation. Also the model can be extended for the case of dynamic media, such as live tissue.
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Affiliation(s)
- Ata Chizari
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
- Address all correspondence to Ata Chizari,
| | - Wilson Tsong
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
| | - Tom Knop
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
| | - Wiendelt Steenbergen
- University of Twente, Technical Medical Centre, Faculty of Science and Technology, Biomedical Photonic Imaging Group, Enschede, The Netherlands
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Crouzet C, Phan T, Wilson RH, Shin TJ, Choi B. Intrinsic, widefield optical imaging of hemodynamics in rodent models of Alzheimer's disease and neurological injury. Neurophotonics 2023; 10:020601. [PMID: 37143901 PMCID: PMC10152182 DOI: 10.1117/1.nph.10.2.020601] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 03/30/2023] [Indexed: 05/06/2023]
Abstract
The complex cerebrovascular network is critical to controlling local cerebral blood flow (CBF) and maintaining brain homeostasis. Alzheimer's disease (AD) and neurological injury can result in impaired CBF regulation, blood-brain barrier breakdown, neurovascular dysregulation, and ultimately impaired brain homeostasis. Measuring cortical hemodynamic changes in rodents can help elucidate the complex physiological dynamics that occur in AD and neurological injury. Widefield optical imaging approaches can measure hemodynamic information, such as CBF and oxygenation. These measurements can be performed over fields of view that range from millimeters to centimeters and probe up to the first few millimeters of rodent brain tissue. We discuss the principles and applications of three widefield optical imaging approaches that can measure cerebral hemodynamics: (1) optical intrinsic signal imaging, (2) laser speckle imaging, and (3) spatial frequency domain imaging. Future work in advancing widefield optical imaging approaches and employing multimodal instrumentation can enrich hemodynamic information content and help elucidate cerebrovascular mechanisms that lead to the development of therapeutic agents for AD and neurological injury.
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Affiliation(s)
- Christian Crouzet
- University of California, Irvine, Beckman Laser Institute and Medical Clinic, Irvine, California, United States
| | - Thinh Phan
- University of California, Irvine, Beckman Laser Institute and Medical Clinic, Irvine, California, United States
- University of California, Irvine, Department of Biomedical Engineering, Irvine, California, United States
| | - Robert H. Wilson
- University of California, Irvine, Beckman Laser Institute and Medical Clinic, Irvine, California, United States
- University of California, Irvine, Department of Medicine, Irvine, California, United States
| | - Teo Jeon Shin
- University of California, Irvine, Beckman Laser Institute and Medical Clinic, Irvine, California, United States
- Seoul National University, Department of Pediatric Dentistry and Dental Research Institute, Seoul, Republic of Korea
| | - Bernard Choi
- University of California, Irvine, Beckman Laser Institute and Medical Clinic, Irvine, California, United States
- University of California, Irvine, Department of Biomedical Engineering, Irvine, California, United States
- University of California, Irvine, Department of Surgery, Irvine, California, United States
- University of California, Irvine, Edwards Lifesciences Foundation Cardiovascular Innovation Research Center, California, United States
- Address all correspondence to Bernard Choi,
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21
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Sullender CT, Santorelli A, Richards LM, Mannava PK, Smith C, Dunn AK. Using pressure-driven flow systems to evaluate laser speckle contrast imaging. J Biomed Opt 2023; 28:036003. [PMID: 36915371 PMCID: PMC10007838 DOI: 10.1117/1.jbo.28.3.036003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 02/02/2023] [Indexed: 06/18/2023]
Abstract
SIGNIFICANCE Microfluidic flow phantom studies are commonly used for characterizing the performance of laser speckle contrast imaging (LSCI) instruments. The selection of the flow control system is critical for the reliable generation of flow during testing. The majority of recent LSCI studies using microfluidics used syringe pumps for flow control. AIM We quantified the uncertainty in flow generation for a syringe pump and a pressure-regulated flow system. We then assessed the performance of both LSCI and multi-exposure speckle imaging (MESI) using the pressure-regulated flow system across a range of flow speeds. APPROACH The syringe pump and pressure-regulated flow systems were evaluated during stepped flow profile experiments in a microfluidic device using an inline flow sensor. The uncertainty associated with each flow system was calculated and used to determine the reliability for instrument testing. The pressure-regulated flow system was then used to characterize the relative performance of LSCI and MESI during stepped flow profile experiments while using the inline flow sensor as reference. RESULTS The pressure-regulated flow system produced much more stable and reproducible flow outputs compared to the syringe pump. The expanded uncertainty for the syringe pump was 8 to 20 × higher than that of the pressure-regulated flow system across the tested flow speeds. Using the pressure-regulated flow system, MESI outperformed single-exposure LSCI at all flow speeds and closely mirrored the flow sensor measurements, with average errors of 4.6 % ± 2.6 % and 15.7 % ± 4.6 % , respectively. CONCLUSIONS Pressure-regulated flow systems should be used instead of syringe pumps when assessing the performance of flow measurement techniques with microfluidic studies. MESI offers more accurate relative flow measurements than traditional LSCI across a wide range of flow speeds.
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Affiliation(s)
- Colin T. Sullender
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Adam Santorelli
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Lisa M. Richards
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Pawan K. Mannava
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Christopher Smith
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Andrew K. Dunn
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
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22
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Ruan Z, Li R, Dong W, Cui Z, Yang H, Ren R. Laser speckle contrast imaging to monitor microcirculation: An effective method to predict outcome in patients with sepsis and septic shock. Front Bioeng Biotechnol 2023; 10:1067739. [PMID: 36743655 PMCID: PMC9890168 DOI: 10.3389/fbioe.2022.1067739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Accepted: 12/19/2022] [Indexed: 01/13/2023] Open
Abstract
Background: This study examines the microcirculation of patients with sepsis and septic shock using Laser Speckle Contrast Imaging (LSCI) technology, to enhance monitoring and predict outcomes of sepsis and septic shock. Methods: From 01 July 2021, to 31 January 2022, 44 patients diagnosed with septic shock and sepsis were included in the study, their clinical data were collected, and LSCI was used to monitor the mean peripheral blood flow perfusion index (PI). Results: The average peripheral blood flow PI of septic shock patients was significantly lower than that of septic patients, with a cutoff value of 26.25. The average peripheral blood flow PI negatively correlated with acute physiology and chronic health evaluation (APACHE) Ⅱ score (p = .01 < .05), sequential organ failure assessment (SOFA) score (p < .01), and lactic acid levels (p = .01 < .05). We report average peripheral blood flow no correlation with age, mean arterial pressure, body temperature, oxygen saturation, heart rate, and body mass index. There was no correlation with procalcitonin, C-reactive protein (CRP), red blood cell distribution width, or platelet distribution width (p > .05). PI significantly correlated with the group sepsis and septic shock (p < .001, r = -.865). And PI significantly correlated with the outcome or mortality (p = .007 < .05, r = -.398). The ROC curve was calculated for PI and the sensitivity was 81.3%, and the specificity was 75% when PI cutoff value chooses 20.88. Conclusion: LSCI technology successfully detected the fingertip microcirculation of patients with septic shock. LSCI can reliably differentiate patients with sepsis vs patients with septic shock. Additionally, the average peripheral blood PI negatively correlated with APACHE Ⅱ, SOFA score, and lactate acid levels, providing useful and supplementary information for the diagnosis and monitoring of septic shock. Trial registration: Chictr2100046761. Registered on May 28, 2021. Clinical Trial Registration: clinicaltrials.gov, identifier Chictr2100046761.
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Affiliation(s)
- Zhengshang Ruan
- Department of Infectious Diseases, Xinhua Children’s Hospital, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ran Li
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Wenwen Dong
- Department of Anesthesiology and Surgical Intensive Care Unit, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Zhilei Cui
- Department of Respiratory Medicine, XinHua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China,*Correspondence: Zhilei Cui, ; Hui Yang, ; Rongrong Ren,
| | - Hui Yang
- School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China,*Correspondence: Zhilei Cui, ; Hui Yang, ; Rongrong Ren,
| | - Rongrong Ren
- Department of Anesthesiology and Surgical Intensive Care Unit, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China,*Correspondence: Zhilei Cui, ; Hui Yang, ; Rongrong Ren,
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23
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Bottino DA, Bouskela E. Non-invasive techniques to access in vivo the skin microcirculation in patients. Front Med (Lausanne) 2023; 9:1099107. [PMID: 36687444 PMCID: PMC9849756 DOI: 10.3389/fmed.2022.1099107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 12/12/2022] [Indexed: 01/06/2023] Open
Abstract
The microcirculation is composed of blood vessels with mean internal diameter smaller than 100 μm. This structure is responsible for survival of cells and in the last 50 years its study has become increasingly interesting because it often participates in the pathophysiology of several diseases or can determine better or worse prognosis for them. Due to the growing importance of knowing more about the microcirculation, several techniques have been developed and now it is possible to study its structure or function. In the last 25 years, the cutaneous microcirculation has emerged as an accessible and representative portion of generalized vascular bed allowing the examination of mechanisms of microcirculatory function and dysfunction. This mini review presents several techniques used for non-invasive access to skin microcirculation, such as Nailfold Videocapillaroscopy, Orthogonal Polarization Spectral Imaging, Sidestream Dark Field Imaging, Incident Dark field Illumination, Laser Doppler Flowmetry, and Laser Speckle Contrast Imaging applied. The techniques presented will describe which types of variables (structural or functional) can be evaluated, their limitations and potential uses.
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24
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Guven G, Dijkstra A, Kuijper TM, Trommel N, van Baar ME, Topeli A, Ince C, van der Vlies CH. Comparison of laser speckle contrast imaging with laser Doppler perfusion imaging for tissue perfusion measurement. Microcirculation 2023; 30:e12795. [PMID: 36524297 PMCID: PMC10078364 DOI: 10.1111/micc.12795] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 11/29/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
OBJECTIVE Laser-based tissue perfusion monitoring techniques have been increasingly used in animal and human research to assess blood flow. However, these techniques use arbitrary units, and knowledge about their comparability is scarce. This study aimed to model the relationship between laser speckle contrast imaging (LSCI) and laser Doppler perfusion imaging (LDPI), for measuring tissue perfusion over a wide range of blood flux values. METHODS Fifteen healthy volunteers (53% female, median age 29 [IQR 22-40] years) were enrolled in this study. We performed iontophoresis with sodium nitroprusside on the forearm to induce regional vasodilation to increase skin blood flux. Besides, a stepwise vascular occlusion was applied on the contralateral upper arm to reduce blood flux. Both techniques were compared using a linear mixed model analysis. RESULTS Baseline blood flux values measured by LSCI were 33 ± 6.5 arbitrary unit (AU) (Coefficient of variation [CV] = 20%) and by LDPI 60 ± 11.5 AU (CV = 19%). At the end of the iontophoresis protocol, the regional blood flux increased to 724 ± 412% and 259 ± 87% of baseline measured by LDPI and LSCI, respectively. On the other hand, during the stepwise vascular occlusion test, the blood flux reduced to 212 ± 40% and 412 ± 177% of its baseline at LDPI and LSCI, respectively. A strong correlation was found between the LSCI and LDPI instruments at increased blood flux with respect to baseline skin blood flux; however, the correlation was weak at reduced blood flux with respect to baseline. DISCUSSION LSCI and LDPI instruments are highly linear for blood flux higher than baseline skin blood flux; however, the correlation decreased for blood flux lower than baseline. This study's findings could be a basis for using LSCI in specific patient populations, such as burn care.
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Affiliation(s)
- Goksel Guven
- Department of Intensive Care, Erasmus MC, Rotterdam, The Netherlands.,Departments of Trauma and Burn Surgery, Maasstad Ziekenhuis, Rotterdam, The Netherlands.,Department of Internal Medicine, Division of Intensive Care, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Annemieke Dijkstra
- Departments of Trauma and Burn Surgery, Maasstad Ziekenhuis, Rotterdam, The Netherlands
| | | | - Nicole Trommel
- Departments of Trauma and Burn Surgery, Maasstad Ziekenhuis, Rotterdam, The Netherlands
| | | | - Arzu Topeli
- Department of Internal Medicine, Division of Intensive Care, Hacettepe University Faculty of Medicine, Ankara, Turkey
| | - Can Ince
- Department of Intensive Care, Erasmus MC, Rotterdam, The Netherlands
| | - Cornelis Hendrik van der Vlies
- Departments of Trauma and Burn Surgery, Maasstad Ziekenhuis, Rotterdam, The Netherlands.,Trauma Research Unit Department of Surgery, Erasmus MC, Rotterdam, The Netherlands
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25
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Margouta A, Anyfanti P, Lazaridis A, Nikolaidou B, Mastrogiannis K, Malliora A, Patsatsi A, Triantafyllou A, Douma S, Doumas M, Gkaliagkousi E. Blunted Microvascular Reactivity in Psoriasis Patients in the Absence of Cardiovascular Disease, as Assessed by Laser Speckle Contrast Imaging. Life (Basel) 2022; 12. [PMID: 36362951 DOI: 10.3390/life12111796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 10/27/2022] [Accepted: 11/03/2022] [Indexed: 11/09/2022] Open
Abstract
Psoriasis is associated with accelerated rates of cardiovascular disease (CVD). Laser Speckle Contrast Imaging (LSCI) is a novel, non-interventional technique for the dynamic assessment of microvascular endothelial dysfunction, which represents an early precursor of CVD. We investigated whether skin microvascular reactivity is impaired in psoriasis and whether an association exists with large artery stiffening. Skin microvascular reactivity was assessed with LSCI combined with post-occlusive reactive hyperaemia protocol in psoriasis patients and controls in the absence of established CVD. Arterial stiffness and central hemodynamics were assessed throughout a whole 24 h period with the Mobil-O-Graph device. Most LSCI indices of microvascular reactivity were impaired in psoriasis patients (n = 90) compared to controls (n = 45) [baseline flux; occlusion flux; peak-to-baseline magnitude; baseline cutaneous vascular conductance (CVC); percentage increase in CVC, p < 0.001 for all comparisons]. In multivariate analysis, psoriatic disease predicted the above markers independently of classical CVD risk factors. Augmentation index, peripheral pulse pressure, and central systolic/diastolic blood pressure correlated with LSCI microvascular responses in the study population (n = 135). Pulse wave velocity significantly correlated with nearly all LSCI parameters, while the association with baseline flux was independent of CVD risk factors and psoriatic disease in multivariate analysis (beta = 0.096, p = 0.039). This study provides evidence of altered skin microvascular responses in psoriasis by use of LSCI, and interaction with macrovascular dysfunction, before the establishment of overt CVD. A non-interventional approach of skin microcirculation with LSCI might be used as an early indicator of vascular health in psoriasis.
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26
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Wang Y, Tiusaba L, Jacobs S, Saruwatari M, Ning B, Levitt M, Sandler AD, Nam SH, Kang JU, Cha J. Unsupervised and quantitative intestinal ischemia detection using conditional adversarial network in multimodal optical imaging. J Med Imaging (Bellingham) 2022; 9:064502. [PMID: 36466077 PMCID: PMC9704416 DOI: 10.1117/1.jmi.9.6.064502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 11/03/2022] [Indexed: 11/30/2023] Open
Abstract
Purpose Intraoperative evaluation of bowel perfusion is currently dependent upon subjective assessment. Thus, quantitative and objective methods of bowel viability in intestinal anastomosis are scarce. To address this clinical need, a conditional adversarial network is used to analyze the data from laser speckle contrast imaging (LSCI) paired with a visible-light camera to identify abnormal tissue perfusion regions. Approach Our vision platform was based on a dual-modality bench-top imaging system with red-green-blue (RGB) and dye-free LSCI channels. Swine model studies were conducted to collect data on bowel mesenteric vascular structures with normal/abnormal microvascular perfusion to construct the control or experimental group. Subsequently, a deep-learning model based on a conditional generative adversarial network (cGAN) was utilized to perform dual-modality image alignment and learn the distribution of normal datasets for training. Thereafter, abnormal datasets were fed into the predictive model for testing. Ischemic bowel regions could be detected by monitoring the erroneous reconstruction from the latent space. The main advantage is that it is unsupervised and does not require subjective manual annotations. Compared with the conventional qualitative LSCI technique, it provides well-defined segmentation results for different levels of ischemia. Results We demonstrated that our model could accurately segment the ischemic intestine images, with a Dice coefficient and accuracy of 90.77% and 93.06%, respectively, in 2560 RGB/LSCI image pairs. The ground truth was labeled by multiple and independent estimations, combining the surgeons' annotations with fastest gradient descent in suspicious areas of vascular images. The total processing time was 0.05 s for an image size of 256 × 256 . Conclusions The proposed cGAN can provide pixel-wise and dye-free quantitative analysis of intestinal perfusion, which is an ideal supplement to the traditional LSCI technique. It has potential to help surgeons increase the accuracy of intraoperative diagnosis and improve clinical outcomes of mesenteric ischemia and other gastrointestinal surgeries.
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Affiliation(s)
- Yaning Wang
- Johns Hopkins University, Department of Electrical and Computer Engineering, Baltimore, Maryland, United States
| | - Laura Tiusaba
- Children’s National Hospital, Division of Colorectal and Pelvic Reconstruction, Washington, District of Columbia, United States
| | - Shimon Jacobs
- Children’s National Hospital, Division of Colorectal and Pelvic Reconstruction, Washington, District of Columbia, United States
| | - Michele Saruwatari
- Children’s National Hospital, Sheikh Zayed Surgical Institute, Washington, District of Columbia, United States
| | - Bo Ning
- Children’s National Hospital, Sheikh Zayed Surgical Institute, Washington, District of Columbia, United States
| | - Marc Levitt
- Children’s National Hospital, Division of Colorectal and Pelvic Reconstruction, Washington, District of Columbia, United States
| | - Anthony D. Sandler
- Children’s National Hospital, Sheikh Zayed Surgical Institute, Washington, District of Columbia, United States
| | - So-Hyun Nam
- Dong-A University Medical Center, Department of Surgery, Busan, Republic of Korea
| | - Jin U. Kang
- Johns Hopkins University, Department of Electrical and Computer Engineering, Baltimore, Maryland, United States
| | - Jaepyeong Cha
- Children’s National Hospital, Sheikh Zayed Surgical Institute, Washington, District of Columbia, United States
- George Washington University School of Medicine and Health Sciences, Department of Pediatrics, Washington, District of Columbia, United States
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27
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Morales-Vargas E, Padilla-Martinez JP, Peregrina-Barreto H, Garcia-Suastegui WA, Ramirez-San-Juan JC. Adaptive Feature Extraction for Blood Vessel Segmentation and Contrast Recalculation in Laser Speckle Contrast Imaging. Micromachines (Basel) 2022; 13:1788. [PMID: 36296143 PMCID: PMC9609016 DOI: 10.3390/mi13101788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 09/30/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Microvasculature analysis in biomedical images is essential in the medical area to evaluate diseases by extracting properties of blood vessels, such as relative blood flow or morphological measurements such as diameter. Given the advantages of Laser Speckle Contrast Imaging (LSCI), several studies have aimed to reduce inherent noise to distinguish between tissue and blood vessels at higher depths. These studies have shown that computing Contrast Images (CIs) with Analysis Windows (AWs) larger than standard sizes obtains better statistical estimators. The main issue is that larger samples combine pixels of microvasculature with tissue regions, reducing the spatial resolution of the CI. This work proposes using adaptive AWs of variable size and shape to calculate the features required to train a segmentation model that discriminates between blood vessels and tissue in LSCI. The obtained results show that it is possible to improve segmentation rates of blood vessels up to 45% in high depths (≈900 μm) by extracting features adaptively. The main contribution of this work is the experimentation with LSCI images under different depths and exposure times through adaptive processing methods, furthering the understanding the performance of the different approaches under these conditions. Results also suggest that it is possible to train a segmentation model to discriminate between pixels belonging to blood vessels and those belonging to tissue. Therefore, an adaptive feature extraction method may improve the quality of the features and thus increase the classification rates of blood vessels in LSCI.
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Affiliation(s)
- Eduardo Morales-Vargas
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Santa Maria Tonantzintla, San Andres Cholula 72840, Mexico
| | | | - Hayde Peregrina-Barreto
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Santa Maria Tonantzintla, San Andres Cholula 72840, Mexico
| | | | - Julio Cesar Ramirez-San-Juan
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Luis Enrique Erro 1, Santa Maria Tonantzintla, San Andres Cholula 72840, Mexico
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28
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Chong SH, Ong YH, El Khatib M, Allu SR, Parthasarathy AB, Greenberg JH, Yodh AG, Vinogradov SA. Real-time tracking of brain oxygen gradients and blood flow during functional activation. Neurophotonics 2022; 9:045006. [PMID: 36457848 PMCID: PMC9704417 DOI: 10.1117/1.nph.9.4.045006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Accepted: 11/01/2022] [Indexed: 06/11/2023]
Abstract
Significance Cerebral metabolic rate of oxygen ( CMRO 2 ) consumption is a key physiological variable that characterizes brain metabolism in a steady state and during functional activation. Aim We aim to develop a minimally invasive optical technique for real-time measurement of CMRO 2 concurrently with cerebral blood flow (CBF). Approach We used a pair of macromolecular phosphorescent probes with nonoverlapping optical spectra, which were localized in the intra- and extravascular compartments of the brain tissue, thus providing a readout of oxygen gradients between these two compartments. In parallel, we measured CBF using laser speckle contrast imaging. Results The method enables computation and tracking of CMRO 2 during functional activation with high temporal resolution ( ∼ 7 Hz ). In contrast to other approaches, our assessment of CMRO 2 does not require measurements of CBF or hemoglobin oxygen saturation. Conclusions The independent records of intravascular and extravascular partial pressures of oxygen, CBF, and CMRO 2 provide information about the physiological events that accompany neuronal activation, creating opportunities for dynamic quantification of brain metabolism.
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Affiliation(s)
- Sang Hoon Chong
- University of Pennsylvania, Department of Physics and Astronomy, Philadelphia, Pennsylvania, United States
| | - Yi Hong Ong
- University of Pennsylvania, Department of Physics and Astronomy, Philadelphia, Pennsylvania, United States
- University of Pennsylvania, Department of Radiation Oncology, Philadelphia, Pennsylvania, United States
| | - Mirna El Khatib
- University of Pennsylvania, Perelman School of Medicine, Department of Biochemistry and Biophysics, Philadelphia, Pennsylvania, United States
- University of Pennsylvania, School of Arts and Sciences, Department of Chemistry, Philadelphia, Pennsylvania, United States
| | - Srinivasa Rao Allu
- University of Pennsylvania, Perelman School of Medicine, Department of Biochemistry and Biophysics, Philadelphia, Pennsylvania, United States
- University of Pennsylvania, School of Arts and Sciences, Department of Chemistry, Philadelphia, Pennsylvania, United States
| | - Ashwin B. Parthasarathy
- University of South Florida, Department of Electrical Engineering, Tampa, Florida, United States
| | - Joel H. Greenberg
- University of Pennsylvania, Department of Neurology, Philadelphia, Pennsylvania, United States
| | - Arjun G. Yodh
- University of Pennsylvania, Department of Physics and Astronomy, Philadelphia, Pennsylvania, United States
| | - Sergei A. Vinogradov
- University of Pennsylvania, Perelman School of Medicine, Department of Biochemistry and Biophysics, Philadelphia, Pennsylvania, United States
- University of Pennsylvania, School of Arts and Sciences, Department of Chemistry, Philadelphia, Pennsylvania, United States
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29
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Hu P, Niu B, Yang H, Xia Y, Chen D, Meng C, Chen K, Biswal B. Analysis and visualization methods for detecting functional activation using laser speckle contrast imaging. Microcirculation 2022; 29:e12783. [PMID: 36070200 DOI: 10.1111/micc.12783] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 08/12/2022] [Accepted: 08/30/2022] [Indexed: 12/30/2022]
Abstract
BACKGROUND Previous studies have used regional cerebral blood flow (CBF) hemodynamic response to measure brain activities. In this work, we use a laser speckle contrast imaging (LSCI) apparatus to sample the CBF activation in somatosensory cortex (S1BF) with repetitive whisker stimulation. Traditionally, the CBF activations were processed by depicting the change percentage above baseline; however, it is not clear how different methods influence the detection of activations. AIMS Thus, in this work we investigate the influence of different methods to detect activations in LSCI. MATERIALS & METHODS First, principal component analysis (PCA) was performed to denoise the CBF signal. As the signal of the first principal component (PC1) showed the highest correlation with the S1BF CBF response curve, PC1 was used in the subsequent analyses. Then, we used fast Fourier transform (FFT) to evaluate the frequency properties of the LSCI images and the activation map was generated based on the amplitude of the central frequency. Furthermore, Pearson's correlation coefficient (C-C) analysis and a general linear model (GLM) were performed to estimate the S1BF activation based on the time series of PC1. RESULTS We found that GLM performed better in identifying activation than C-C. Additionally, the activation maps generated by FFT were similar to those obtained by GLM. Particularly, the superficial vein and arterial vessels separated the activation region as segmented activated areas, and the regions with unresolved vessels showed a common activation for whisker stimulation. DISCUSSION AND CONCLUSION Our research analyzed the extent to which PCA can extract meaningful information from the signal and we compared the performance for detecting brain functional activation between different methods that rely on LSCI. This can be used as a reference for LSCI researchers on choosing the best method to estimate brain activation.
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Affiliation(s)
- Peng Hu
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Bochao Niu
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Hang Yang
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China
| | - Yang Xia
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.,University of Electronic Science & Technology of China, Sichuan Institute Brain Science & Brain Inspired Intelligence, Chengdu, China
| | - Donna Chen
- Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, New Jersey, USA
| | - Chun Meng
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.,University of Electronic Science & Technology of China, Sichuan Institute Brain Science & Brain Inspired Intelligence, Chengdu, China
| | - Ke Chen
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.,University of Electronic Science & Technology of China, Sichuan Institute Brain Science & Brain Inspired Intelligence, Chengdu, China
| | - Bharat Biswal
- University of Electronic Science & Technology of China, The Clinical Hospital of Chengdu Brain Science Institute, MOE Key Laboratory for Neuroinformation, School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.,Department of Biomedical Engineering, New Jersey Institute of Technology, Newark, New Jersey, USA
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30
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Wildeboer A, Heeman W, van der Bilt A, Hoff C, Calon J, Boerma EC, Al-Taher M, Bouvy N. Laparoscopic Laser Speckle Contrast Imaging Can Visualize Anastomotic Perfusion: A Demonstration in a Porcine Model. Life (Basel) 2022; 12:life12081251. [PMID: 36013430 PMCID: PMC9409722 DOI: 10.3390/life12081251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 08/08/2022] [Accepted: 08/12/2022] [Indexed: 11/26/2022]
Abstract
Background: Intestinal resection causes inevitable vascular damage, which cannot always be seen during an intraoperative clinical assessment of local intestinal perfusion. If left unaltered, impaired perfusion can lead to complications, such as anastomotic leakage (AL). Therefore, we demonstrate the use of a novel laparoscopic laser speckle contrast imaging (LSCI)-based approach in order to assess local intestinal perfusion during the construction of intestinal anastomoses. Methods: Three segments were isolated from the small intestine of a pig, while the perfusion of each was compromised by coagulating 7–8 mesenteric arteries. Both clinical assessments and LSCI were used to detect the induced perfusion deficits and to subsequently guide a transection in either a well perfused, marginally perfused, or poorly perfused tissue area within the segment. Bowel ends were then utilized for the creation of three differently perfused anastomoses: well perfused/well perfused (anastomosis segment 1), well perfused/poorly perfused (anastomosis segment 2), and poorly perfused/poorly perfused (anastomosis segment 3). After construction of the anastomoses, a final perfusion assessment using both clinical assessment and LSCI was executed in order to evaluate the vascular viability of the anastomosis. Results: Laparoscopic LSCI enabled continuous assessment of local intestinal perfusion and allowed for detection of perfusion deficits in real time. The imaging feedback precisely guided the surgical procedure, and, when evaluating the final anastomotic perfusion, LSCI was able to visualize the varying degrees of perfusion, whereas standard clinical assessment yielded only minor differences in visual appearance of the tissue. Conclusions: In this technical note, we demonstrate a novel LSCI-based approach for intraoperative perfusion assessment. With its ability to continuously visualize perfusion in real time, laparoscopic LSCI has significant potential for the optimization of anastomotic surgery in the near future.
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Affiliation(s)
- Aurelia Wildeboer
- Department of Surgery, Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands
- Correspondence:
| | - Wido Heeman
- University Campus Fryslân, University of Groningen, 8911 CE Leeuwarden, The Netherlands
- Department of Surgery, University Medical Centre Groningen, 9713 GZ Groningen, The Netherlands
- LIMIS Development BV, 8934 AD Leeuwarden, The Netherlands
| | - Arne van der Bilt
- Department of Surgery, University Medical Centre Groningen, 9713 GZ Groningen, The Netherlands
| | - Christiaan Hoff
- Department of Surgery, Medical Centre Leeuwarden, 8934 AD Leeuwarden, The Netherlands
| | - Joost Calon
- ZiuZ Visual Intelligence BV, 8401 DK Gorredijk, The Netherlands
| | - E. Christiaan Boerma
- Department of Intensive Care, Medical Centre Leeuwarden, 8934 AD Leeuwarden, The Netherlands
| | - Mahdi Al-Taher
- Department of Surgery, Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands
| | - Nicole Bouvy
- Department of Surgery, Maastricht University Medical Center, 6229 HX Maastricht, The Netherlands
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Hu Z, Li D, Zhong X, Li Y, Xuan A, Yu T, Zhu J, Zhu D. In vivo tissue optical clearing assisted through-skull targeted photothrombotic ischemic stroke model in mice. J Biomed Opt 2022; 27:065001. [PMID: 35676747 PMCID: PMC9174889 DOI: 10.1117/1.jbo.27.6.065001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
SIGNIFICANCE Photothrombotic stroke is an important and widely used model for ischemic stroke research. However, the significant scattering of the skull during the procedure limits the light's ability to penetrate and focus on its target. Targeted photothrombosis uses surgery-based skull windows to obtain optical access to the brain, but it renders the brain's environment unnatural even before a stroke is established. AIM To establish a targeted, controllable ischemic stroke model in mice through an intact skull. APPROACH The in vivo skull optical clearing technique provides a craniotomy-free "optical window" that allows light to penetrate. Alongside the local photodynamic effect, we have established targeted photothrombosis without skull removal, effectively controlling the degree of thrombotic occlusion by changing the light dose. RESULTS Ex vivo and in vivo results demonstrated that skull optical clearing treatment significantly enhanced light's ability to penetrate the skull and focus on its target, contributing to thrombotic occlusion. The skull optical clearing window was also used for continuous blood flow mapping, and the relationship between light dose and injury degree was evaluated over 14 days of monitoring. Per our findings, increasing the light dose was accompanied by more severe infarction, indicating that the model was easily controllable. CONCLUSIONS Herein, a targeted, controllable ischemic stroke model was established by combinedly running an in vivo skull optical clearing technique and a photothrombotic procedure, avoiding unnecessary damage or environmental changes to the brain caused by surgery on the skull. Our established model should offer significant value to research on ischemic stroke.
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Affiliation(s)
- Zhengwu Hu
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Dongyu Li
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Xiang Zhong
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Yusha Li
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Ang Xuan
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Tingting Yu
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Jingtan Zhu
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
| | - Dan Zhu
- Huazhong University of Science and Technology, Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Hubei, Wuhan, China
- Huazhong University of Science and Technology, MoE Key Laboratory for Biomedical Photonics, Hubei, Wuhan, China
- Optics Valley Laboratory, Hubei, China
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Gusliakova OI, Prikhozhdenko ES, Plastun VO, Mayorova OA, Shushunova NA, Abdurashitov AS, Kulikov OA, Abakumov MA, Gorin DA, Sukhorukov GB, Sindeeva OA. Renal Artery Catheterization for Microcapsules' Targeted Delivery to the Mouse Kidney. Pharmaceutics 2022; 14:1056. [PMID: 35631642 PMCID: PMC9144148 DOI: 10.3390/pharmaceutics14051056] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2022] [Revised: 05/07/2022] [Accepted: 05/12/2022] [Indexed: 02/04/2023] Open
Abstract
The problem of reducing the side effects associated with drug distribution throughout the body in the treatment of various kidney diseases can be solved by effective targeted drug delivery. The method described herein involves injection of a drug encapsulated in polyelectrolyte capsules to achieve prolonged local release and long-term capillary retention of several hours while these capsules are administered via the renal artery. The proposed method does not imply disruption (puncture) of the renal artery or aorta and is suitable for long-term chronic experiments on mice. In this study, we compared how capsule size and dosage affect the target kidney blood flow. It has been established that an increase in the diameter of microcapsules by 29% (from 3.1 to 4.0 μm) requires a decrease in their concentration by at least 50% with the same suspension volume. The photoacoustic method, along with laser speckle contrast imaging, was shown to be useful for monitoring blood flow and selecting a safe dose. Capsules contribute to a longer retention of a macromolecular substance in the target kidney compared to its free form due to mechanical retention in capillaries and slow impregnation into surrounding tissues during the first 1-3 h, which was shown by fluorescence tomography and microscopy. At the same time, the ability of capillaries to perform almost complete "self-cleaning" from capsular shells during the first 12 h leads to the preservation of organ tissues in a normal state. The proposed strategy, which combines endovascular surgery and the injection of polymer microcapsules containing the active substance, can be successfully used to treat a wide range of nephropathies.
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Affiliation(s)
- Olga I. Gusliakova
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia; (E.S.P.); (V.O.P.); (O.A.M.); (N.A.S.)
| | - Ekaterina S. Prikhozhdenko
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia; (E.S.P.); (V.O.P.); (O.A.M.); (N.A.S.)
| | - Valentina O. Plastun
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia; (E.S.P.); (V.O.P.); (O.A.M.); (N.A.S.)
| | - Oksana A. Mayorova
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia; (E.S.P.); (V.O.P.); (O.A.M.); (N.A.S.)
| | - Natalia A. Shushunova
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia; (E.S.P.); (V.O.P.); (O.A.M.); (N.A.S.)
| | - Arkady S. Abdurashitov
- Center for Neurobiology and Brain Restoration, Skolkovo Institute of Science and Technology, 3 Nobel Str., 143005 Moscow, Russia; (A.S.A.); (G.B.S.)
| | - Oleg A. Kulikov
- Institute of Medicine, National Research Ogarev Mordovia State University, 68 Bolshevistskaya Str., 430005 Saransk, Russia;
| | - Maxim A. Abakumov
- Department of Medical Nanobiotecnology, Pirogov Russian National Research Medical University, 1 Ostrovityanova Str., 117997 Moscow, Russia;
| | - Dmitry A. Gorin
- Center for Photonics and Quantum Materials, Skolkovo Institute of Science and Technology, 3 Nobel Str., 143005 Moscow, Russia;
| | - Gleb B. Sukhorukov
- Center for Neurobiology and Brain Restoration, Skolkovo Institute of Science and Technology, 3 Nobel Str., 143005 Moscow, Russia; (A.S.A.); (G.B.S.)
- School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
| | - Olga A. Sindeeva
- Science Medical Center, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia; (E.S.P.); (V.O.P.); (O.A.M.); (N.A.S.)
- Center for Neurobiology and Brain Restoration, Skolkovo Institute of Science and Technology, 3 Nobel Str., 143005 Moscow, Russia; (A.S.A.); (G.B.S.)
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Tao S, Zhang T, Zhou K, Liu X, Feng Y, Zhao W, Chen J. Intraoperative Monitoring Cerebral Blood Flow During the Treatment of Brain Arteriovenous Malformations in Hybrid Operating Room by Laser Speckle Contrast Imaging. Front Surg 2022; 9:855397. [PMID: 35599788 PMCID: PMC9120635 DOI: 10.3389/fsurg.2022.855397] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Accepted: 03/18/2022] [Indexed: 11/13/2022] Open
Abstract
Background Hemodynamic changes caused by hybrid surgery for brain arteriovenous malformations (bAVM) are usually related to long-term lesions from "blood stealing". There are currently no viable low-cost, noninvasive procedures for assessing cerebral perfusion in the operating room. This study aims to investigate the use of intraoperative laser speckle contrast image (LSCI) software in AVM surgery. Methods In Zhongnan Hospital of Wuhan University, 14 patients who underwent surgery with LSCI were collected. To analyze the hemodynamic features of AVM and the influence on the peripheral cortex of AVM embolization and resection, we assessed the transit time between feeding arteries and drainage veins by intraoperative digital subtraction angiography (DSA). Meanwhile, LSCI was performed at pre-embolization, post-embolization, and after complete resection of bAVM. Results In this study, the transit time of bAVM before and after embolization was compared, the transit time before embolization was significantly shorter than that after embolization (p < 0.05). We also got good visualization of relative CBF, in addition, to flow imaging in the cortical vasculature round bAVM with LSCI. The flux of post-surgery was significantly higher than pre-embolization (p < 0.01). Conclusion Hemodynamic variable assessment plays an important role in the resection of AVM in the hybrid operative room and LSCI can be used to visualize and evaluate cortical cerebral blood flow to detect pathological hyperperfusion in real-time with a good spatial-temporal resolution in a sensitive and continuous, non-invasive mode.
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Affiliation(s)
- Sicai Tao
- Department of Neurosurgery, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Tingbao Zhang
- Department of Neurosurgery, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Keyao Zhou
- Department of Neurosurgery, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Xiaohu Liu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
| | - Yu Feng
- Department of Neurosurgery, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Wenyuan Zhao
- Department of Neurosurgery, Zhongnan Hospital, Wuhan University, Wuhan, China
| | - Jincao Chen
- Department of Neurosurgery, Zhongnan Hospital, Wuhan University, Wuhan, China
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Miller DR, Ashour R, Sullender CT, Dunn AK. Continuous blood flow visualization with laser speckle contrast imaging during neurovascular surgery. Neurophotonics 2022; 9:021908. [PMID: 35265733 PMCID: PMC8900813 DOI: 10.1117/1.nph.9.2.021908] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Accepted: 02/11/2022] [Indexed: 06/14/2023]
Abstract
Significance: Laser speckle contrast imaging (LSCI) has emerged as a promising tool for intraoperative cerebral blood flow (CBF) monitoring because it produces real-time full-field blood flow maps noninvasively and label free. Aim: We aim to demonstrate the ability of LSCI to continuously visualize blood flow during neurovascular procedures. Approach: LSCI hardware was attached to the surgical microscope and did not interfere with the normal operation of the microscope. To more easily visualize CBF in real time, LSCI images were registered with the built-in microscope white light camera such that LSCI images were overlaid on the white light images and displayed to the neurosurgeon continuously in real time. Results: LSCI was performed throughout each surgery when the microscope was positioned over the patient, providing the surgeon with real-time visualization of blood flow changes before, during, and after aneurysm clipping or arteriovenous malformation (AVM) resection in humans. LSCI was also compared with indocyanine green angiography (ICGA) to assess CBF during aneurysm clipping and AVM surgery; integration of the LSCI hardware with the microscope enabled simultaneous acquisition of LSCI and ICGA. Conclusions: The results suggest that LSCI can provide continuous and real-time CBF visualization without affecting the surgeon workflow or requiring a contrast agent. The results also demonstrate that LSCI and ICGA provide different, yet complementary information about vessel perfusion.
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Affiliation(s)
- David R. Miller
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Ramsey Ashour
- The University of Texas at Austin, Dell Medical School, Department of Neurosurgery, Austin, Texas, United States
| | - Colin T. Sullender
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Andrew K. Dunn
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
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Jafari CZ, Mihelic SA, Engelmann S, Dunn AK. High-resolution three-dimensional blood flow tomography in the subdiffuse regime using laser speckle contrast imaging. J Biomed Opt 2022; 27:JBO-210364SSR. [PMID: 35362273 PMCID: PMC8968074 DOI: 10.1117/1.jbo.27.8.083011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 03/04/2022] [Indexed: 06/14/2023]
Abstract
SIGNIFICANCE Visualizing high-resolution hemodynamics in cerebral tissue over a large field of view (FOV), provides important information in studying disease states affecting the brain. Current state-of-the-art optical blood flow imaging techniques either lack spatial resolution or are too slow to provide high temporal resolution reconstruction of flow map over a large FOV. AIM We present a high spatial resolution computational optical imaging technique based on principles of laser speckle contrast imaging (LSCI) for reconstructing the blood flow maps in complex tissue over a large FOV provided that the three-dimensional (3D) vascular structure is known or assumed. APPROACH Our proposed method uses a perturbation Monte Carlo simulation of the high-resolution 3D geometry for both accurately deriving the speckle contrast forward model and calculating the Jacobian matrix used in our reconstruction algorithm to achieve high resolution. Given the convex nature of our highly nonlinear problem, we implemented a mini-batch gradient descent with an adaptive learning rate optimization method to iteratively reconstruct the blood flow map. Specifically, we implemented advanced optimization techniques combined with efficient parallelization and vectorization of the forward and derivative calculations to make reconstruction of the blood flow map feasible with reconstruction times on the order of tens of minutes. RESULTS We tested our reconstruction algorithm through simulation of both a flow phantom model as well as an anatomically correct murine cerebral tissue and vasculature captured via two-photon microscopy. Additionally, we performed a noise study, examining the robustness of our inverse model in presence of 0.1% and 1% additive noise. In all cases, the blood flow reconstruction error was <2 % for most of the vasculature, except for the peripheral vasculature which suffered from insufficient photon sampling. Descending vasculature and deeper structures showed slightly higher sensitivity to noise compared with vasculature with a horizontal orientation at the more superficial layers. Our results show high-resolution reconstruction of the blood flow map in tissue down to 500 μm and beyond. CONCLUSIONS We have demonstrated a high-resolution computational imaging technique for visualizing blood flow map in complex tissue over a large FOV. Once a high-resolution structural image is captured, our reconstruction algorithm only requires a few LSCI images captured through a camera to reconstruct the blood flow map computationally at a high resolution. We note that the combination of high temporal and spatial resolution of our reconstruction algorithm makes the solution well-suited for applications involving fast monitoring of flow dynamics over a large FOV, such as in functional neural imaging.
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Affiliation(s)
- Chakameh Z. Jafari
- The University of Texas at Austin, Department of Electrical and Computer Engineering, Austin, Texas, United States
| | - Samuel A. Mihelic
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Shaun Engelmann
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
| | - Andrew K. Dunn
- The University of Texas at Austin, Department of Electrical and Computer Engineering, Austin, Texas, United States
- The University of Texas at Austin, Department of Biomedical Engineering, Austin, Texas, United States
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Feng X, Yu Y, Zou D, Jin Z, Zhou C, Liu G, Fujimoto JG, Li C, Lu Y, Ren Q. Functional imaging of human retina using integrated multispectral and laser speckle contrast imaging. J Biophotonics 2022; 15:e202100285. [PMID: 34726828 DOI: 10.1002/jbio.202100285] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/25/2021] [Accepted: 10/29/2021] [Indexed: 06/13/2023]
Abstract
A novel integration of retinal multispectral imaging (MSI), retinal oximetry and laser speckle contrast imaging (LSCI) is presented for functional imaging of retinal blood vessels that could potentially allow early detection or monitoring of functional changes. We designed and built a cost-effective, scalable, retinal imaging instrument that integrates structural and functional retinal imaging techniques, including MSI, retinal oximetry and LSCI. Color fundus imaging was performed with 470 nm, 550 nm and 600 nm wavelength light emitting diode (LED) illumination. Retinal oximetry was performed using 550 nm and 600 nm LED illumination. LSCI of blood flow was performed using 850 nm laser diode illumination at 82 frames per second. LSCI can visualize retinal and choroidal vasculature without requiring exogenous contrast agents and can provide time-resolved information on blood flow, generating a cardiac pulse waveform from retinal vasculature. The technology can rapidly acquire structural MSI images, retinal oximetry and LSCI blood flow information in a simplified clinical workflow without requiring patients to move between instruments. Results from multiple modalities can be combined and registered to provide structural as well as functional information on the retina. These advances can reduce barriers for clinical adoption, accelerating research using MSI, retinal oximetry and LSCI of blood flow for diagnosis, monitoring and elucidating disease pathogenesis.
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Affiliation(s)
- Ximeng Feng
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China
- Institute of Medical Technology, Peking University, Beijing, China
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
- National Biomedical Imaging Center, Beijing, China
| | - Yue Yu
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China
- Institute of Medical Technology, Peking University, Beijing, China
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
- National Biomedical Imaging Center, Beijing, China
| | - Da Zou
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China
- Institute of Medical Technology, Peking University, Beijing, China
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
- National Biomedical Imaging Center, Beijing, China
| | - Zi Jin
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Chuanqing Zhou
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Gangjun Liu
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - James G Fujimoto
- Department of Electrical Engineering and Computer Science, Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Changhui Li
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China
- National Biomedical Imaging Center, Beijing, China
| | - Yanye Lu
- Institute of Medical Technology, Peking University, Beijing, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Qiushi Ren
- Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China
- Institute of Medical Technology, Peking University, Beijing, China
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China
- Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
- National Biomedical Imaging Center, Beijing, China
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Guilbert J, Desjardins M. Movement correction method for laser speckle contrast imaging of cerebral blood flow in cranial windows in rodents. J Biophotonics 2022; 15:e202100218. [PMID: 34658168 DOI: 10.1002/jbio.202100218] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 09/07/2021] [Accepted: 10/08/2021] [Indexed: 06/13/2023]
Abstract
Laser speckle contrast imaging (LSCI) is used in clinical research to dynamically image blood flow. One drawback is its susceptibility to movement artifacts. We demonstrate a new, simple method to correct motion artifacts in LSCI signals measured in awake mice with cranial windows during sensory stimulation. The principle is to identify a region in the image in which speckle contrast (SC) is independent of blood flow and only varies with animal movement, then to regress out this signal from the data. We show that (1) the regressed signal correlates well with mouse head movement, (2) the corrected signal correlates better with independently measured blood volume and (3) it has a (59 ± 6)% higher signal-to-noise ratio. Compared to three alternative correction methods, ours has the best performance. Regressing out flow-independent global variations in SC is a simple and accessible way to improve the quality of LSCI measurements.
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Affiliation(s)
- Jérémie Guilbert
- Department of Physics, Physical Engineering and Optics, Université Laval, Québec City, Québec, Canada
- Oncology Division, Centre de recherche du CHU de Québec-Université Laval, Québec City, Québec, Canada
| | - Michèle Desjardins
- Department of Physics, Physical Engineering and Optics, Université Laval, Québec City, Québec, Canada
- Oncology Division, Centre de recherche du CHU de Québec-Université Laval, Québec City, Québec, Canada
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Lu Y, Wang RK. Removing dynamic distortions from laser speckle flowgraphy using Eigen-decomposition and spatial filtering. J Biophotonics 2022; 15:e202100294. [PMID: 34787958 DOI: 10.1002/jbio.202100294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/29/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
Laser speckle flowgraphy (LSFG) has been widely used in the investigation of blood flows in ophthalmology. However, the dynamic changes of the ocular optics can impose artificial contrasts to the LSFG, corrupting the detection of both retinal vasculature and blood pulsation at the posterior segment of the human eye. In this study, we propose to use Eigen-decomposition method to separate the spatially and temporally varying speckle patterns from the static tissues. Spatial filtering is further applied to remove the distortion-correlated modulation of the speckle patterns. We experimentally show that with the proposed method, the integrity of blood vessels is significantly improved and the distortions in pulse waveforms can be well corrected.
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Affiliation(s)
- Yiming Lu
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
| | - Ruikang K Wang
- Department of Bioengineering, University of Washington, Seattle, Washington, USA
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Seker FB, Fan Z, Gesierich B, Gaubert M, Sienel RI, Plesnila N. Neurovascular Reactivity in the Aging Mouse Brain Assessed by Laser Speckle Contrast Imaging and 2-Photon Microscopy: Quantification by an Investigator-Independent Analysis Tool. Front Neurol 2021; 12:745770. [PMID: 34858312 PMCID: PMC8631776 DOI: 10.3389/fneur.2021.745770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 10/08/2021] [Indexed: 11/13/2022] Open
Abstract
The brain has a high energy demand but little to no energy stores. Therefore, proper brain function relies on the delivery of glucose and oxygen by the cerebral vasculature. The regulation of cerebral blood flow (CBF) occurs at the level of the cerebral capillaries and is driven by a fast and efficient crosstalk between neurons and vessels, a process termed neurovascular coupling (NVC). Experimentally NVC is mainly triggered by sensory stimulation and assessed by measuring either CBF by laser Doppler fluxmetry, laser speckle contrast imaging (LSCI), intrinsic optical imaging, BOLD fMRI, near infrared spectroscopy (NIRS) or functional ultrasound imaging (fUS). Since these techniques have relatively low spatial resolution, diameters of cerebral vessels are mainly assessed by 2-photon microscopy (2-PM). Results of studies on NVC rely on stable animal physiology, high-quality data acquisition, and unbiased data analysis, criteria, which are not easy to achieve. In the current study, we assessed NVC using two different imaging modalities, i.e., LSCI and 2-PM, and analyzed our data using an investigator-independent Matlab-based analysis tool, after manually defining the area of analysis in LSCI and vessels to measure in 2-PM. By investigating NVC in 6–8 weeks, 1-, and 2-year-old mice, we found that NVC was maximal in 1-year old mice and was significantly reduced in aged mice. These findings suggest that NVC is differently affected during the aging process. Most interestingly, specifically pial arterioles, seem to be distinctly affected by the aging. The main finding of our study is that the automated analysis tool works very efficiently in terms of time and accuracy. In fact, the tool reduces the analysis time of one animal from approximately 23 h to about 2 s while basically making no mistakes. In summary, we developed an experimental workflow, which allows us to reliably measure NVC with high spatial and temporal resolution in young and aged mice and to analyze these data in an investigator-independent manner.
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Affiliation(s)
- Fatma Burcu Seker
- Institute for Stroke and Dementia Research, Munich University Hospital and University of Munich, Munich, Germany
| | - Ziyu Fan
- Institute for Stroke and Dementia Research, Munich University Hospital and University of Munich, Munich, Germany
| | - Benno Gesierich
- Institute for Stroke and Dementia Research, Munich University Hospital and University of Munich, Munich, Germany
| | - Malo Gaubert
- Institute for Stroke and Dementia Research, Munich University Hospital and University of Munich, Munich, Germany
| | - Rebecca Isabella Sienel
- Institute for Stroke and Dementia Research, Munich University Hospital and University of Munich, Munich, Germany
| | - Nikolaus Plesnila
- Institute for Stroke and Dementia Research, Munich University Hospital and University of Munich, Munich, Germany.,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
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Chen H, Shi Y, Bo B, Zhao D, Miao P, Tong S, Wang C. Real-Time Cerebral Vessel Segmentation in Laser Speckle Contrast Image Based on Unsupervised Domain Adaptation. Front Neurosci 2021; 15:755198. [PMID: 34916898 PMCID: PMC8669333 DOI: 10.3389/fnins.2021.755198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 10/20/2021] [Indexed: 12/02/2022] Open
Abstract
Laser speckle contrast imaging (LSCI) is a full-field, high spatiotemporal resolution and low-cost optical technique for measuring blood flow, which has been successfully used for neurovascular imaging. However, due to the low signal-noise ratio and the relatively small sizes, segmenting the cerebral vessels in LSCI has always been a technical challenge. Recently, deep learning has shown its advantages in vascular segmentation. Nonetheless, ground truth by manual labeling is usually required for training the network, which makes it difficult to implement in practice. In this manuscript, we proposed a deep learning-based method for real-time cerebral vessel segmentation of LSCI without ground truth labels, which could be further integrated into intraoperative blood vessel imaging system. Synthetic LSCI images were obtained with a synthesis network from LSCI images and public labeled dataset of Digital Retinal Images for Vessel Extraction, which were then used to train the segmentation network. Using matching strategies to reduce the size discrepancy between retinal images and laser speckle contrast images, we could further significantly improve image synthesis and segmentation performance. In the testing LSCI images of rodent cerebral vessels, the proposed method resulted in a dice similarity coefficient of over 75%.
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Affiliation(s)
- Heping Chen
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- School of Technology and Health, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Yan Shi
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Bin Bo
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Denghui Zhao
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Peng Miao
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Shanbao Tong
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Chunliang Wang
- School of Technology and Health, KTH Royal Institute of Technology, Stockholm, Sweden
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Reynès C, Beaume JB, Latil-Plat F, Ennaifer H, Rocher L, Antoine-Jonville S, Benamo E, Knapp Y, Vinet A. Concomitant Peripheral Neuropathy and Type 2 Diabetes Impairs Postexercise Cutaneous Perfusion and Flowmotion. J Clin Endocrinol Metab 2021; 106:e3979-e3989. [PMID: 34111245 DOI: 10.1210/clinem/dgab414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Indexed: 12/18/2022]
Abstract
CONTEXT Type 2 diabetes and peripheral neuropathy exhibit microvascular dysfunction at rest. However, data regarding their microvascular perfusion during exercise remain scarce. OBJECTIVE This study investigated changes in microvascular perfusion during postexercise recovery in those with type 2 diabetes, with or without peripheral neuropathy, as well as in healthy controls and those with obesity. METHODS Skin blood perfusion was assessed in each group using laser Doppler flowmetry (LDF) and laser speckle contrast imaging before and immediately after a 6-minute walking test. LDF recordings underwent wavelet transformation to allow specific control mechanisms of blood perfusion to be studied (eg, endothelial nitric oxide-independent and -dependent, neurogenic, myogenic, respiratory, and cardiac mechanisms). RESULTS Skin blood perfusion increased after exercise in all groups (22.3 ± 28.1% with laser speckle contrast imaging and 22.1 ± 52.5% with LDF). Throughout postexercise recovery, the decrease was blunted in those with subclinical peripheral neuropathy and confirmed peripheral neuropathy when compared to the other 3 groups. After exercise, total spectral power increased in all groups. The relative contributions of each endothelial band was lower in those with confirmed peripheral neuropathy than in the healthy controls and those with obesity (nitric oxide-dependent function: 23.6 ± 8.9% vs 35.5 ± 5.8% and 29.3 ± 8.8%, respectively; nitric oxide-independent function: 49.1 ± 23.7% vs 53.3 ± 10.4% and 64.6 ± 11.4%, respectively). The neurogenic contribution decreased less in those with confirmed peripheral neuropathy and in those with type 2 diabetes alone, compared to those with subclinical peripheral neuropathy and those with obesity (-14.5 ± 9.9% and -12.2 ± 6.1% vs -26.5 ± 4.7% and -21.7 ± 9.4%, respectively). CONCLUSION Peripheral neuropathy, whatever the stage, altered the microvascular response to exercise via impaired endothelial and neurogenic mechanisms.
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Affiliation(s)
- Cécile Reynès
- Avignon Université, LAPEC EA4278, F-84000, Avignon, France
| | | | - Françoise Latil-Plat
- Service endocrinologie et maladies métaboliques, Centre hospitalier Henri Duffaut, F-84000, Avignon, France
| | - Houda Ennaifer
- Service endocrinologie et maladies métaboliques, Centre hospitalier Henri Duffaut, F-84000, Avignon, France
| | - Laure Rocher
- Service endocrinologie et maladies métaboliques, Centre hospitalier Henri Duffaut, F-84000, Avignon, France
| | | | - Eric Benamo
- Service endocrinologie et maladies métaboliques, Centre hospitalier Henri Duffaut, F-84000, Avignon, France
| | - Yannick Knapp
- Avignon Université, LAPEC EA4278, F-84000, Avignon, France
| | - Agnès Vinet
- Avignon Université, LAPEC EA4278, F-84000, Avignon, France
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42
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Mennes OA, van Netten JJ, van Baal JG, Slart RHJA, Steenbergen W. The Association between Foot and Ulcer Microcirculation Measured with Laser Speckle Contrast Imaging and Healing of Diabetic Foot Ulcers. J Clin Med 2021; 10:3844. [PMID: 34501291 DOI: 10.3390/jcm10173844] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 08/13/2021] [Accepted: 08/20/2021] [Indexed: 12/30/2022] Open
Abstract
Diagnosis of peripheral artery disease in people with diabetes and a foot ulcer using current non-invasive blood pressure measurements is challenging. Laser speckle contrast imaging (LSCI) is a promising non-invasive technique to measure cutaneous microcirculation. This study investigated the association between microcirculation (measured with both LSCI and non-invasive blood pressure measurement) and healing of diabetic foot ulcers 12 and 26 weeks after measurement. We included sixty-one patients with a diabetic foot ulcer in this prospective, single-center, observational cohort-study. LSCI scans of the foot, ulcer, and ulcer edge were conducted, during baseline and post-occlusion hyperemia. Non-invasive blood pressure measurement included arm, foot, and toe pressures and associated indices. Healing was defined as complete re-epithelialization and scored at 12 and 26 weeks. We found no significant difference between patients with healed or non-healed foot ulcers for both types of measurements (p = 0.135-0.989). ROC curves demonstrated moderate sensitivity (range of 0.636-0.971) and specificity (range of 0.464-0.889), for LSCI and non-invasive blood pressure measurements. Therefore, no association between diabetic foot ulcer healing and LSCI-measured microcirculation or non-invasive blood pressure measurements was found. The healing tendency of diabetic foot ulcers is difficult to predict based on single measurements using current blood pressure measurements or LSCI.
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Lynch CE, Eisenbaum M, Algamal M, Balbi M, Ferguson S, Mouzon B, Saltiel N, Ojo J, Diaz-Arrastia R, Mullan M, Crawford F, Bachmeier C. Impairment of cerebrovascular reactivity in response to hypercapnic challenge in a mouse model of repetitive mild traumatic brain injury. J Cereb Blood Flow Metab 2021; 41:1362-1378. [PMID: 33050825 PMCID: PMC8142124 DOI: 10.1177/0271678x20954015] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Incidences of repetitive mild TBI (r-mTBI), like those sustained by contact sports athletes and military personnel, are thought to be a risk factor for development of neurodegenerative disorders. Those suffering from chronic TBI-related illness demonstrate deficits in cerebrovascular reactivity (CVR), the ability of the cerebral vasculature to respond to a vasoactive stimulus. CVR is thus an important measure of traumatic cerebral vascular injury (TCVI), and a possible in vivo endophenotype of TBI-related neuropathogenesis. We combined laser speckle imaging of CVR in response to hypercapnic challenge with neurobehavioral assessment of learning and memory, to investigate if decreased cerebrovascular responsiveness underlies impaired cognitive function in our mouse model of chronic r-mTBI. We demonstrate a profile of blunted hypercapnia-evoked CVR in the cortices of r-mTBI mice like that of human TBI, alongside sustained memory and learning impairment, without biochemical or immunohistopathological signs of cerebral vessel laminar or endothelium constituent loss. Transient decreased expression of alpha smooth muscle actin and platelet-derived growth factor receptor β, indicative of TCVI, is obvious only at the time of the most pronounced CVR deficit. These findings implicate CVR as a valid preclinical measure of TCVI, perhaps useful for developing therapies targeting TCVI after recurrent mild head trauma.
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Affiliation(s)
- Cillian E Lynch
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK.,James A. Haley Veteran's Administration, Tampa, FL, USA.,Department of Neurology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Maxwell Eisenbaum
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK
| | - Moustafa Algamal
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK
| | - Matilde Balbi
- Department of Psychiatry, University of British Columbia, Vancouver, British Columbia, Canada
| | - Scott Ferguson
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK
| | - Benoit Mouzon
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK.,James A. Haley Veteran's Administration, Tampa, FL, USA
| | | | - Joseph Ojo
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK.,James A. Haley Veteran's Administration, Tampa, FL, USA
| | - Ramon Diaz-Arrastia
- Department of Neurology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Mike Mullan
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK
| | - Fiona Crawford
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK.,James A. Haley Veteran's Administration, Tampa, FL, USA
| | - Corbin Bachmeier
- The Roskamp Institute, Sarasota, FL, USA.,Department of Life Sciences, The Open University, Milton Keynes, UK.,Bay Pines VA Healthcare System, Bay Pines, FL, USA
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Mannoh EA, Parker LB, Thomas G, Solórzano CC, Mahadevan-Jansen A. Development of an imaging device for label-free parathyroid gland identification and vascularity assessment. J Biophotonics 2021; 14:e202100008. [PMID: 33583122 PMCID: PMC8556476 DOI: 10.1002/jbio.202100008] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 06/12/2023]
Abstract
During thyroid surgeries, it is important for surgeons to accurately identify healthy parathyroid glands and assess their vascularity to preserve their function postoperatively, thus preventing hypoparathyroidism and hypocalcemia. Near infrared autofluorescence detection enables parathyroid identification, while laser speckle contrast imaging allows assessment of parathyroid vascularity. Here, we present an imaging system combining the two techniques to perform both functions, simultaneously and label-free. An algorithm to automate the segmentation of a parathyroid gland in the fluorescence image to determine its average speckle contrast is also presented, reducing a barrier to clinical translation. Results from imaging ex vivo tissue samples show that the algorithm is equivalent to manual segmentation. Intraoperative images from representative procedures are presented showing successful implementation of the device to identify and assess vascularity of healthy and diseased parathyroid glands.
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Affiliation(s)
- Emmanuel A. Mannoh
- Vanderbilt Biophotonics Center, Nashville, TN 37235
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235
| | - Logan B. Parker
- Vanderbilt Biophotonics Center, Nashville, TN 37235
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235
| | - Giju Thomas
- Vanderbilt Biophotonics Center, Nashville, TN 37235
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235
| | - Carmen C. Solórzano
- Division of Surgical Oncology and Endocrine Surgery, Vanderbilt University Medical Center, Nashville, TN 37232
| | - Anita Mahadevan-Jansen
- Vanderbilt Biophotonics Center, Nashville, TN 37235
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN 37235
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Strandby RB, Osterkamp JTF, Ambrus R, Henriksen A, Goetze JP, Secher NH, Achiam MP, Svendsen L. Mesenteric traction syndrome in pigs: A single-blinded, randomized controlled trial. Animal Model Exp Med 2021; 4:162-168. [PMID: 34179723 PMCID: PMC8212818 DOI: 10.1002/ame2.12160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 02/01/2021] [Indexed: 12/03/2022] Open
Abstract
Background Mesenteric traction syndrome is commonly observed in patients undergoing upper abdominal surgery and is associated with severe postoperative complications. A triad of hypotension, tachycardia, and facial flushing seems provoked by prostacyclin (PGI2) release from the gut in response to mesenteric traction. The administration of nonsteroidal anti-inflammatory drugs (NSAID) inhibits PGI2 release, stabilizing the hemodynamic response. Here, we examined the effect of mesenteric traction on splanchnic blood flow in pigs randomized to NSAID or placebo treatment. Materials and Methods Twenty pigs were allocated to either ketorolac or placebo treatment. Five minutes of manual mesenteric traction was applied. Plasma 6-keto-PGF1α, a stable metabolite of PGI2, hemodynamic variables, and regional blood flow (laser speckle contrast imaging) to the liver, stomach, small intestine, upper lip, and snout (laser Doppler flowmetry) were recorded prior to traction and 5 and 30 minutes thereafter. Results Both groups of pigs presented a decrease in systemic vascular resistance (P = .01), mean arterial blood pressure (P = .001), and blood flow in the gastric antrum (P = .002). Plasma 6-keto-PGF1α did not increase in either group (P = .195), and cardiac output, heart rate, central venous pressure, and blood flow to the liver, small intestine, upper lip, and snout remained unchanged. Conclusion Mesenteric traction resulted in cardiovascular depression, including reduced blood flow in the gastric antrum. Plasma 6-keto-PGF1α did not increase, and ketorolac administration did not alter the response to mesenteric traction. Furthers studies are needed to identify which substance is responsible for eliciting the cardiovascular response to mesenteric traction in pigs.
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Affiliation(s)
- Rune B. Strandby
- Department of Surgical Gastroenterology, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Jens T. F. Osterkamp
- Department of Surgical Gastroenterology, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Rikard Ambrus
- Department of Surgical Gastroenterology, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Amelie Henriksen
- Department of Surgical Gastroenterology, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Jens P. Goetze
- Department of Clinical Biochemistry, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Niels H. Secher
- Department of Anaesthesia, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Michael P. Achiam
- Department of Surgical Gastroenterology, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
| | - Lars‐Bo Svendsen
- Department of Surgical Gastroenterology, RigshospitaletUniversity of CopenhagenCopenhagen ØDenmark
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Heeman W, Maassen H, Calon J, van Goor H, Leuvenink H, van Dam GM, Boerma EC. Real-time visualization of renal microperfusion using laser speckle contrast imaging. J Biomed Opt 2021; 26:JBO-200389RR. [PMID: 34024055 PMCID: PMC8140613 DOI: 10.1117/1.jbo.26.5.056004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 05/07/2021] [Indexed: 05/02/2023]
Abstract
SIGNIFICANCE Intraoperative parameters of renal cortical microperfusion (RCM) have been associated with postoperative ischemia/reperfusion injury. Laser speckle contrast imaging (LSCI) could provide valuable information in this regard with the advantage over the current standard of care of being a non-contact and full-field imaging technique. AIM Our study aims to validate the use of LSCI for the visualization of RCM on ex vivo perfused human-sized porcine kidneys in various models of hemodynamic changes. APPROACH A comparison was made between three renal perfusion measures: LSCI, the total arterial renal blood flow (RBF), and sidestream dark-field (SDF) imaging in different settings of ischemia/reperfusion. RESULTS LSCI showed a good correlation with RBF for the reperfusion experiment (0.94 ± 0.02; p < 0.0001) and short- and long-lasting local ischemia (0.90 ± 0.03; p < 0.0001 and 0.81 ± 0.08; p < 0.0001, respectively). The correlation decreased for low flow situations due to RBF redistribution. The correlation between LSCI and SDF (0.81 ± 0.10; p < 0.0001) showed superiority over RBF (0.54 ± 0.22; p < 0.0001). CONCLUSIONS LSCI is capable of imaging RCM with high spatial and temporal resolutions. It can instantaneously detect local perfusion deficits, which is not possible with the current standard of care. Further development of LSCI in transplant surgery could help with clinical decision making.
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Affiliation(s)
- Wido Heeman
- University of Groningen, Faculty Campus Fryslân, Leeuwarden, The Netherlands
- University Medical Centre Groningen, Department of Surgery, Groningen, The Netherlands
- LIMIS Development BV, Leeuwarden, The Netherlands
- Address all correspondence to Wido Heeman,
| | - Hanno Maassen
- University Medical Centre Groningen, Department of Surgery, Groningen, The Netherlands
- University Medical Centre Groningen, Department of Pathology and Medical Biology, Groningen, The Netherlands
| | - Joost Calon
- ZiuZ Visual Intelligence, Gorredijk, The Netherlands
| | - Harry van Goor
- University Medical Centre Groningen, Department of Pathology and Medical Biology, Groningen, The Netherlands
| | - Henri Leuvenink
- University Medical Centre Groningen, Department of Surgery, Groningen, The Netherlands
| | - Gooitzen M. van Dam
- University Medical Centre Groningen, Department of Surgery, Groningen, The Netherlands
| | - E. Christiaan Boerma
- Medical Centre Leeuwarden, Department of Intensive Care, Leeuwarden, The Netherlands
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Yang Y, Liu L, Yang R, Ding X, Li Y, Liu H, Yan H. Blood perfusion in hypertrophic scars and keloids studied by laser speckle contrast imaging. Skin Res Technol 2021; 27:789-796. [PMID: 33651469 DOI: 10.1111/srt.13020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Accepted: 01/25/2021] [Indexed: 11/30/2022]
Abstract
BACKGROUND This study used laser speckle contrast imaging (LSCI) to evaluate the difference in blood perfusion between hypertrophic scars and keloids. MATERIALS AND METHODS A total of 30 keloids, 21 early hypertrophic scars, 20 proliferative hypertrophic scars, 20 regressive hypertrophic scars, and 20 mature hypertrophic scars were enrolled into this study. Vancouver Scar Scale (VSS) was assessed by a plastic surgeon. LSCI was used to evaluate perfusion of the whole (W), marginal (M), central (C) regions, and surrounding normal skin of the scars, and ratios (M/N, C/N) were calculated. RESULTS The perfusion of the marginal region in the keloid was significantly higher than that of the central region. Nevertheless, there was no significant difference in perfusion between the central and marginal regions in the early, proliferative, regressive, and mature hypertrophic scars. The degree of perfusion and perfusion ratio in the marginal region of keloid was similar to that of proliferative hypertrophic scars, and the degree of perfusion and perfusion ratio in central region of keloid group was similar to that of early and regressive hypertrophic scars. CONCLUSIONS The difference in perfusion distribution in keloids and hypertrophic scars may provide ideas for their identification. LSCI may be a useful method for differentiating between keloids and hypertrophic scars.
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Affiliation(s)
- Yuting Yang
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Lan Liu
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Ruxi Yang
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Xiaobing Ding
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Ying Li
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Hongjun Liu
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
| | - Hong Yan
- Department of Plastic and Burn Surgery, National Key Clinical Construction Specialty, Wound Repair and Regeneration Laboratory, The Affiliated Hospital of Southwest Medical University, Luzhou, China
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Lindstedt S, Wlosinska M, Nilsson AC, Hlebowicz J, Fakhro M, Sheikh R. Successful improved peripheral tissue perfusion was seen in patients with atherosclerosis after 12 months of treatment with aged garlic extract. Int Wound J 2021; 18:681-691. [PMID: 33590955 PMCID: PMC8450802 DOI: 10.1111/iwj.13570] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 02/01/2021] [Indexed: 12/30/2022] Open
Abstract
Patients with arteriolosclerosis have impaired microvascular perfusion leading to impaired wound healing. Aged garlic extract has shown to have a positive impact on vascular elasticity. The present study aimed to assess the effect of long‐term treatment with AGE on peripheral tissue perfusion in patients with confirmed atherosclerosis. Ninety three patients with a CT‐scan confirmed coronary artery arteriolosclerosis were randomised in a double‐blind manner to placebo or 2400 mg AGE daily for 1 year. Peripheral tissue perfusion was evaluated at 0‐ and 12‐months using Laser Speckle Contrast Imaging. Measurement of post occlusive reactive hyperemia (PORH) and cutaneous vascular conductance (CVC) using acetylcholine iontophoresis (Ach) was conducted. After 12 months a significant increase of 21.6% (95% CI 3.2%‐40.0%, P < .05) was seen in the relative change of PORH in the AGE compared with the placebo group. The same response was seen for CVC and Ach with an increase of 21.4% (95% CI 3.4%‐39.4%, P < .05) in the AGE group compared with the placebo group. Aged garlic extract regenerated peripheral tissue perfusion and increase microcirculation in patients with arteriolosclerosis. Adequate peripheral tissue perfusion and tissue oxygen tension are important prerequisites for successful tissue repair. Restored microcirculation in patients could hypothetically facilitate wound healing.
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Affiliation(s)
- Sandra Lindstedt
- Department of Cardiothoracic Surgery and Transplantation, Clinical Science, Lund University, Skane University Hospital, Lund, Sweden
| | - Martiné Wlosinska
- Department of Cardiothoracic Surgery and Transplantation, Clinical Science, Lund University, Skane University Hospital, Lund, Sweden
| | - Ann-Christin Nilsson
- Department of Cardiothoracic Surgery and Transplantation, Clinical Science, Lund University, Skane University Hospital, Lund, Sweden
| | - Joanna Hlebowicz
- Department of Cardiology, Clinical Sciences, Lund University, Skane University Hospital, Lund, Sweden
| | - Mohammed Fakhro
- Department of Cardiothoracic Surgery and Transplantation, Clinical Science, Lund University, Skane University Hospital, Lund, Sweden
| | - Rafi Sheikh
- Department of Ophthalmology, Clinical Sciences, Lund University, Skane University Hospital, Lund, Sweden
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Ma Q, Liu D, Gong R, Chen S, Fang F, Zhuang Y. Mechanically Induced Vasospasm-Evaluation of Spasmolytic Efficacy of 10 Pharmaceutical Agents Using Laser Speckle Contrast Imaging. Lasers Surg Med 2020; 53:684-694. [PMID: 33259664 DOI: 10.1002/lsm.23347] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 11/11/2022]
Abstract
BACKGROUND AND OBJECTIVES Vasospasm is a thorny problem often encountered in microvascular surgery that seriously threatens the survival of vascularized tissue transfers. This investigation is dedicated to establishing a model of vasospasm and to evaluating the antispasmodic efficacy of 10 pharmacologic agents. STUDY DESIGN/MATERIALS AND METHODS Eighty Sprague-Dawley rats were used. After anesthesia and depilation, the femoral neurovascular bundle was exposed, and a pair of microsurgical forceps were used to trigger vasospasm of the femoral vessels by blunt dissection. Then, 10 pharmacological agents, namely, prostaglandin E1, sodium nitroprusside, magnesium sulfate, papaverine, normal saline, phentolamine, verapamil, 2% lidocaine hydrochloride, amrinone, and 12% lidocaine hydrochloride, were dripped to the femoral vessels, after which laser speckle contrast imaging was used to collect perfusion images, acquiring the perfusion and the inner caliber of the femoral vessels at multiple timepoints. Furthermore, blood perfusion and the time consumed to escape vasospasm and reach hyperperfusion in each group were calculated. The difference of spasmolytic efficacy among the agents was statistically analyzed by one-way analysis of variance. RESULTS There was a significant difference in antispasmodic ability among the 10 agents (P < 0.001). 10% magnesium sulfate and 12% lidocaine were distinguished among the 10 agents in resolving the vasospasm. 10% magnesium sulfate demonstrated the best antispasmodic potency, which enabled the shortest time consumed for vessels to escape spasm and reach hyperperfusion. 12% lidocaine ranked second in efficacy, demonstrating a similar effect except that it could not propel the femoral vein to a state of hyperperfusion. For the remaining agents, the time consumed for the artery to escape spasm was all significantly shortened when compared with normal saline (P < 0.001). For the venous spasm, all agents except prostaglandin E1 could significantly shorten the time consumed for the vein to escape spasm (P < 0.001). CONCLUSIONS In terms of resolving mechanically induced vasospasm, 10% magnesium sulfate is the best antispasmodic, followed by 12% lidocaine. Lasers Surg. Med. © 2020 Wiley Periodicals LLC.
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Affiliation(s)
- Qiming Ma
- Fujian Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350108, China
| | - Donghong Liu
- Aesthetic Department, The Second Affiliated Hospital of Shandong First Medical University, Tai'an, 271000, China
| | - Renyan Gong
- Department of clinical medicine, Fujian Health College, Fuzhou, 350108, China
| | - Shaofeng Chen
- Fujian Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, 350108, China
| | - Fang Fang
- Department of Pharmacology, Fujian Medical University, Fuzhou, China
| | - Yuehong Zhuang
- Fujian Key Laboratory of Brain Aging and Neurodegenerative Diseases, School of Basic Medical Sciences, Institute of Clinical Applied Anatomy, Fujian Medical University, Fuzhou, 350108, China
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Hultman M, Larsson M, Strömberg T, Fredriksson I. Real-time video-rate perfusion imaging using multi-exposure laser speckle contrast imaging and machine learning. J Biomed Opt 2020; 25:JBO-200207R. [PMID: 33191685 PMCID: PMC7666876 DOI: 10.1117/1.jbo.25.11.116007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 10/21/2020] [Indexed: 05/03/2023]
Abstract
SIGNIFICANCE Multi-exposure laser speckle contrast imaging (MELSCI) estimates microcirculatory blood perfusion more accurately than single-exposure LSCI. However, the technique has been hampered by technical limitations due to massive data throughput requirements and nonlinear inverse search algorithms, limiting it to an offline technique where data must be postprocessed. AIM To present an MELSCI system capable of continuous acquisition and processing of MELSCI data, enabling real-time video-rate perfusion imaging with high accuracy. APPROACH The MELSCI algorithm was implemented in programmable hardware (field programmable gate array) closely interfaced to a high-speed CMOS sensor for real-time calculation. Perfusion images were estimated in real-time from the MELSCI data using an artificial neural network trained on simulated data. The MELSCI perfusion was compared to two existing single-exposure metrics both quantitatively in a controlled phantom experiment and qualitatively in vivo. RESULTS The MELSCI perfusion shows higher signal dynamics compared to both single-exposure metrics, both spatially and temporally where heartbeat-related variations are resolved in much greater detail. The MELSCI perfusion is less susceptible to measurement noise and is more linear with respect to laser Doppler perfusion in the phantom experiment (R2 = 0.992). CONCLUSIONS The presented MELSCI system allows for real-time acquisition and calculation of high-quality perfusion at 15.6 frames per second.
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Affiliation(s)
- Martin Hultman
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
- Address all correspondence to Martin Hultman,
| | - Marcus Larsson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Tomas Strömberg
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
| | - Ingemar Fredriksson
- Linköping University, Department of Biomedical Engineering, Linköping, Sweden
- Perimed AB, Järfälla, Stockholm, Sweden
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