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Bratash O, Buhot A, Leroy L, Engel E. Optical fiber biosensors toward in vivo detection. Biosens Bioelectron 2024; 251:116088. [PMID: 38335876 DOI: 10.1016/j.bios.2024.116088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/19/2024] [Accepted: 01/28/2024] [Indexed: 02/12/2024]
Abstract
This review takes stock of the various optical fiber-based biosensors that could be used for in vivo applications. We discuss the characteristics that biosensors must have to be suitable for such applications and the corresponding transduction modes. In particular, we focus on optical fiber biosensors based on fluorescence, evanescent wave, plasmonics, interferometry, and Raman phenomenon. The operational principles, implemented solutions, and performances are described and debated. The different sensing configurations, such as the side- and tip-based fiber biosensors, are illustrated, and their adaptation for in vivo measurements is discussed. The required implementation of multiplexed biosensing on optical fibers is shown. In particular, the use of multi-fiber assemblies, one of the most optimal configurations for multiplexed detection, is discussed. Different possibilities for multiple localized functionalizations on optical fibers are presented. A final section is devoted to the practical in vivo use of fiber-based biosensors, covering regulatory, sterilization, and packaging aspects. Finally, the trends and required improvements in this promising and emerging field are analyzed and discussed.
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Affiliation(s)
- Oleksii Bratash
- Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SyMMES, 38000, Grenoble, France
| | - Arnaud Buhot
- Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SyMMES, 38000, Grenoble, France
| | - Loïc Leroy
- Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SyMMES, 38000, Grenoble, France
| | - Elodie Engel
- Univ. Grenoble Alpes, CEA, CNRS, Grenoble INP, IRIG, SyMMES, 38000, Grenoble, France.
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Cen P, Cui C, Huang J, Chen H, Wu F, Niu J, Zhong Y, Jin C, Zhu WH, Zhang H, Tian M. Cellular senescence imaging and senolysis monitoring in cancer therapy based on a β-galactosidase-activated aggregation-induced emission luminogen. Acta Biomater 2024; 179:340-353. [PMID: 38556136 DOI: 10.1016/j.actbio.2024.03.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/23/2024] [Accepted: 03/27/2024] [Indexed: 04/02/2024]
Abstract
Cellular senescence is a permanent state of cell cycle arrest characterized by increased activity of senescence associated β-galactosidase (SA-β-gal). Notably, cancer cells have been also observed to exhibit the senescence response and are being considered for sequential treatment with pro-senescence therapy followed by senolytic therapy. However, there is currently no effective agent targeting β-galactosidase (β-Gal) for imaging cellular senescence and monitoring senolysis in cancer therapy. Aggregation-induced emission luminogen (AIEgen) demonstrates strong fluorescence, good photostability, and biocompatibility, making it a potential candidate for imaging cellular senescence and monitoring senolysis in cancer therapy when endowed with β-Gal-responsive capabilities. In this study, we introduced a β-Gal-activated AIEgen named QM-β-gal for cellular senescence imaging and senolysis monitoring in cancer therapy. QM-β-gal exhibited good amphiphilic properties and formed aggregates that emitted a fluorescence signal upon β-Gal activation. It showed high specificity towards the activity of β-Gal in lysosomes and successfully visualized DOX-induced senescent cancer cells with intense fluorescence both in vitro and in vivo. Encouragingly, QM-β-gal could image senescent cancer cells in vivo for over 14 days with excellent biocompatibility. Moreover, it allowed for the monitoring of senescent cancer cell clearance during senolytic therapy with ABT263. This investigation indicated the potential of the β-Gal-activated AIEgen, QM-β-gal, as an in vivo approach for imaging cellular senescence and monitoring senolysis in cancer therapy via highly specific and long-term fluorescence imaging. STATEMENT OF SIGNIFICANCE: This work reported a β-galactosidase-activated AIEgen called QM-β-gal, which effectively imaged DOX-induced senescent cancer cells both in vitro and in vivo. QM-β-gal specifically targeted the increased expression and activity of β-galactosidase in senescent cancer cells, localized within lysosomes. It was cleared rapidly before activation but maintained stability after activation in the DOX-induced senescent tumor. The AIEgen exhibited a remarkable long-term imaging capability for senescent cancer cells, lasting over 14 days and enabled monitoring of senescent cancer cell clearance through ABT263-induced apoptosis. This approach held promise for researchers seeking to achieve prolonged imaging of senescent cells in vivo.
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Affiliation(s)
- Peili Cen
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Chunyi Cui
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Jiani Huang
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Hetian Chen
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Fei Wu
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Jiaqi Niu
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Yan Zhong
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Chentao Jin
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China
| | - Wei-Hong Zhu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals, Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China
| | - Hong Zhang
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China; College of Biomedical Engineering & Instrument Science, Zhejiang University, Hangzhou, Zhejiang 310014, China; Key Laboratory for Biomedical Engineering of Ministry of Education, Zhejiang University, Hangzhou, Zhejiang 310014, China.
| | - Mei Tian
- Department of Nuclear Medicine and PET Center, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, China; Institute of Nuclear Medicine and Molecular Imaging of Zhejiang University, Hangzhou, Zhejiang 310009, China; Key Laboratory of Medical Molecular Imaging of Zhejiang Province, Hangzhou, Zhejiang 310009, China; Human Phenome Institute, Fudan University, Shanghai 201203, China.
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Motility Assessment of Ram Spermatozoa. BIOLOGY 2022; 11:biology11121715. [PMID: 36552225 PMCID: PMC9774426 DOI: 10.3390/biology11121715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/11/2022] [Accepted: 11/22/2022] [Indexed: 11/29/2022]
Abstract
For successful fertilisation to occur, spermatozoa need to successfully migrate through the female reproductive tract and penetrate the oocyte. Predictably, poor sperm motility has been associated with low rates of fertilisation in many mammalian species, including the ram. As such, motility is one of the most important parameters used for in vitro evaluation of ram sperm quality and function. This review aims to outline the mechanical and energetic processes which underpin sperm motility, describe changes in motility which occur as a result of differences in sperm structure and the surrounding microenvironment, and assess the effectiveness of the various methods used to assess sperm motility in rams. Methods of subjective motility estimation are convenient, inexpensive methods widely used in the livestock industries, however, the subjective nature of these methods can make them unreliable. Computer-assisted sperm analysis (CASA) technology accurately and objectively measures sperm motility via two-dimensional tracing of sperm head motion, making it a popular method for sperm quality assurance in domesticated animal production laboratories. Newly developed methods of motility assessment including flagellar tracing, three-dimensional sperm tracing, in vivo motility assessment, and molecular assays which quantify motility-associated biomarkers, enable analysis of a new range of sperm motion parameters with the potential to reveal new mechanistic insights and improve ram semen assessment. Experimental application of these technologies is required to fully understand their potential to improve semen quality assessment and prediction of reproductive success in ovine artificial breeding programs.
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Progress of Bulbar Conjunctival Microcirculation Alterations in the Diagnosis of Ocular Diseases. DISEASE MARKERS 2022; 2022:4046809. [PMID: 36072898 PMCID: PMC9441399 DOI: 10.1155/2022/4046809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 08/20/2022] [Indexed: 11/26/2022]
Abstract
Bulbar conjunctival microcirculation is a microvascular system distributed in the translucent bulbar conjunctiva near the corneal limbus. Multiple ocular diseases lead to bulbar conjunctival microcirculation alterations, which means that bulbar conjunctival microcirculation alterations would be potential screening and diagnostic indicators for these ocular diseases. In recent years, with the emergence and application of a variety of noninvasive observation devices for bulbar conjunctiva microcirculation and new image processing technologies, studies that explored the potential of bulbar conjunctival microcirculation alterations in the diagnosis of ocular diseases have been emerging. However, the potential of bulbar conjunctival microcirculation alterations as indicators for ocular diseases has not been exploited to full advantage. The observation devices, image processing methods, and algorithms are not unified. And large-scale research is needed to concrete bulbar conjunctival microcirculation alterations as indicators for ocular diseases. In this paper, we provide an update on the progress of bulbar conjunctival microcirculation alterations in the diagnosis of ocular diseases in recent five years (from January 2017 to March 2022). Relevant ocular diseases include contact lens wearing, dry eye, conjunctival malignant melanoma, conjunctival nevus, and diabetic retinopathy.
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In vivo real-time assessment of the anastomotic blood supply in colorectal surgery using confocal laser endomicroscopy in an anastomotic model. Surg Endosc 2022; 36:4136-4144. [PMID: 34515870 DOI: 10.1007/s00464-021-08738-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Accepted: 09/06/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND STUDY AIMS Anastomotic ischemia can affect healing and eventually lead to anastomotic leakage, and confocal laser endomicroscopy (CLE) can offer detailed observations at the subcellular level. We aimed to evaluate the anastomotic microcirculation in different anastomotic perfusion models using CLE. METHODS Anastomotic perfusion models were established using twelve rabbits distributed into two groups: group A (good perfusion, n = 6) and group B (poor perfusion, n = 6). Afterward, intraoperative detection of anastomotic perfusion was carried out using CLE, and quantitative analysis of blood cells was performed. Rabbits that satisfied the criteria underwent a second exploratory operation and specimens were stained by hematoxylin and eosin. RESULTS Enhanced with fluorescein sodium, capillaries were obviously highlighted in group A, while few capillaries were viewed in group B. Delayed development of fluorescence occurred in group B. The average flow of blood cells was 37.0 ± 5.93 per minute in group A and 6.33 ± 2.16 per minute in group B (p < 0.001). In addition, during the second exploratory surgery, rabbits with inadequate anastomotic perfusion exhibited more serious intestinal adhesion and ischemia. Anastomotic leakage and abdominal infection occurred in all rabbits in group B. CONCLUSION CLE can realize real-time imaging of the anastomotic microcirculation and is a feasible technique for performing intraoperative evaluation in different anastomotic perfusion situations. This animal experiment provides the groundwork for future in vivo research in humans.
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Jiang J, Zhou X, Liu J, Pan L, Pan Z, Zou F, Li Z, Li F, Ma X, Geng C, Zuo J, Li X. Optical Fiber Bundle-Based High-Speed and Precise Micro-Scanning for Image High-Resolution Reconstruction. SENSORS (BASEL, SWITZERLAND) 2021; 22:127. [PMID: 35009670 PMCID: PMC8747347 DOI: 10.3390/s22010127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 12/22/2021] [Accepted: 12/23/2021] [Indexed: 06/14/2023]
Abstract
We propose an imaging method based on optical fiber bundle combined with micro-scanning technique for improving image quality without complex image reconstruction algorithms. In the proposed method, a piezoelectric-ceramic-chip is used as the micro-displacement driver of the optical fiber bundle, which has the advantages of small volume, fast response speed and high precision. The corresponding displacement of the optical fiber bundle can be generated by precise voltage controlling. An optical fiber bundle with core/cladding diameter 4/80 μm and hexagonal arrangement is used to scan the 1951 USAF target. The scanning step is 1 μm, which is equivalent to the diffraction limit resolution of the optical system. The corresponding information is recorded at high speed through photo-detectors and a high-resolution image is obtained by image stitching processing. The minimum distinguishable stripe width of the proposed imaging technique with piezoelectric-ceramic-chip driven micro-scanning is approximately 2.1 μm, which is 1 time higher than that of direct imaging with a CCD camera whose pixel size is close to the fiber core size. The experimental results indicate that the optical fiber bundle combined with piezoelectric-ceramic-chip driven micro-scanning is a high-speed and high-precision technique for high-resolution imaging.
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Affiliation(s)
- Jiali Jiang
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Xin Zhou
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- College of Materials Science and Opto-Electronic Technology, Chinese Academy of Sciences, Beijing 100049, China
| | - Jiaying Liu
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- College of Materials Science and Opto-Electronic Technology, Chinese Academy of Sciences, Beijing 100049, China
| | - Likang Pan
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- College of Materials Science and Opto-Electronic Technology, Chinese Academy of Sciences, Beijing 100049, China
| | - Ziting Pan
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- College of Materials Science and Opto-Electronic Technology, Chinese Academy of Sciences, Beijing 100049, China
| | - Fan Zou
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- College of Materials Science and Opto-Electronic Technology, Chinese Academy of Sciences, Beijing 100049, China
| | - Ziqiang Li
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Feng Li
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Xiaoyu Ma
- Chengdu Institute, Sichuan University of Arts and Science, Dazhou 635000, China;
| | - Chao Geng
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Jing Zuo
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- College of Materials Science and Opto-Electronic Technology, Chinese Academy of Sciences, Beijing 100049, China
| | - Xinyang Li
- Key Laboratory on Adaptive Optics, Chinese Academy of Sciences, Chengdu 610209, China; (J.J.); (X.Z.); (J.L.); (L.P.); (Z.P.); (F.Z.); (Z.L.); (F.L.); (J.Z.); (X.L.)
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
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Daniere C, Louart G, Louart B, Bacle M, Bazalgette F, Perez Martin A, Muller L, Lefrant JY, Roger C. Effects of Fluid Therapy on Mesenteric Microcirculation Using New Probe-Based Confocal Laser Endomicroscopy (Cellvizio®) in a Porcine Model of Endotoxic Shock. J Vasc Res 2021; 59:124-134. [PMID: 34923487 DOI: 10.1159/000519693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 09/14/2021] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Microcirculatory alterations have been observed at the early phase of sepsis, although macrocirculation seems preserved. The aim of this study was to analyze the effect of crystalloid fluid therapy on mesenteric microcirculation, assessed by using the confocal laser endomicroscope Cellvizio®, in an endotoxic porcine model. METHODS It is a prospective endotoxic shock (lipopolysaccharide infusion) experimental trial. Piglets were divided into 3 groups: 6 in the sham group (no LPS injection, no fluid), 9 in the control group (LPS infusion, no fluid), and 6 in the crystalloids group (LPS infusion and fluid resuscitation with crystalloids). Fluid resuscitation consisted in a fluid bolus of 20 mL/kg 0.9% saline over 30 min followed by a 10 mL/kg/h fluid rate over 4 h. Mesenteric microcirculation was assessed using a confocal laser endomicroscope (Cellvizio®). Blood flow within capillaries was visually assessed according to the point of care microcirculation (POEM) score. RESULTS At baseline, the 3 groups were similar regarding hemodynamic, biological, and microcirculatory parameters. At T360, the POEM score significantly decreased in the control and crystalloids groups, whereas it remained unchanged in the sham group (respectively, 1.62 ± 1.06, 1.2 ± 0.45, and 5.0 ± 0, p = 0.011). There was no significant difference in cardiac output at T360 between the sham and crystalloids groups (3.1 ± 0.8 vs. 2.3 ± 0.6, p = 0.132) or between the control and crystalloids groups (2.0 ± 0.6 vs. 2.3 ± 0.6, p = 0.90). CONCLUSION There was no significant improvement of microcirculatory alterations after crystalloids resuscitation despite improvement in macrocirculatory parameters in early experimental sepsis.
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Affiliation(s)
- Charlotte Daniere
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France
| | - Guillaume Louart
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France.,UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
| | - Benjamin Louart
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France.,UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
| | - Marylène Bacle
- Plateau Technique de Recherche Expérimentale de Nîmes (PTNIM), Site Nîmois de la Faculté de Médecine Montpellier-Nîmes, Université de Montpellier, Montpellier, France
| | - Florian Bazalgette
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France.,UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
| | - Antonia Perez Martin
- UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
| | - Laurent Muller
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France.,UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
| | - Jean-Yves Lefrant
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France.,UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
| | - Claire Roger
- Division of Anesthesiology, Department of Intensive Care Medicine, Intensive Care, Pain and Emergency Medicine, Nîmes University Hospital, Nîmes, France.,UR-UM 103, IMAGINE, Univ Montpellier, Pôle Anesthésie Réanimation Douleur Urgence, CHU Nîmes, Nîmes, France
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Barberio M, Benedicenti S, Pizzicannella M, Felli E, Collins T, Jansen-Winkeln B, Marescaux J, Viola MG, Diana M. Intraoperative Guidance Using Hyperspectral Imaging: A Review for Surgeons. Diagnostics (Basel) 2021; 11:diagnostics11112066. [PMID: 34829413 PMCID: PMC8624094 DOI: 10.3390/diagnostics11112066] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 11/03/2021] [Accepted: 11/05/2021] [Indexed: 12/12/2022] Open
Abstract
Hyperspectral imaging (HSI) is a novel optical imaging modality, which has recently found diverse applications in the medical field. HSI is a hybrid imaging modality, combining a digital photographic camera with a spectrographic unit, and it allows for a contactless and non-destructive biochemical analysis of living tissue. HSI provides quantitative and qualitative information of the tissue composition at molecular level in a contrast-free manner, hence making it possible to objectively discriminate between different tissue types and between healthy and pathological tissue. Over the last two decades, HSI has been increasingly used in the medical field, and only recently it has found an application in the operating room. In the last few years, several research groups have used this imaging modality as an intraoperative guidance tool within different surgical disciplines. Despite its great potential, HSI still remains far from being routinely used in the daily surgical practice, since it is still largely unknown to most of the surgical community. The aim of this study is to provide clinical surgeons with an overview of the capabilities, current limitations, and future directions of HSI for intraoperative guidance.
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Affiliation(s)
- Manuel Barberio
- Institute for Research against Digestive Cancer (IRCAD), 67091 Strasbourg, France; (T.C.); (J.M.); (M.D.)
- General Surgery Department, Ospedale Card. G. Panico, 73039 Tricase, Italy; (S.B.); (M.P.); (M.G.V.)
- Correspondence:
| | - Sara Benedicenti
- General Surgery Department, Ospedale Card. G. Panico, 73039 Tricase, Italy; (S.B.); (M.P.); (M.G.V.)
| | - Margherita Pizzicannella
- General Surgery Department, Ospedale Card. G. Panico, 73039 Tricase, Italy; (S.B.); (M.P.); (M.G.V.)
| | - Eric Felli
- Department of Visceral Surgery and Medicine, Inselspital, Bern University Hospital, University of Bern, 3008 Bern, Switzerland;
- Department for BioMedical Research, Visceral Surgery and Medicine, University of Bern, 3008 Bern, Switzerland
| | - Toby Collins
- Institute for Research against Digestive Cancer (IRCAD), 67091 Strasbourg, France; (T.C.); (J.M.); (M.D.)
| | | | - Jacques Marescaux
- Institute for Research against Digestive Cancer (IRCAD), 67091 Strasbourg, France; (T.C.); (J.M.); (M.D.)
| | - Massimo Giuseppe Viola
- General Surgery Department, Ospedale Card. G. Panico, 73039 Tricase, Italy; (S.B.); (M.P.); (M.G.V.)
| | - Michele Diana
- Institute for Research against Digestive Cancer (IRCAD), 67091 Strasbourg, France; (T.C.); (J.M.); (M.D.)
- ICube Laboratory, Photonics Instrumentation for Health, University of Strasbourg, 67400 Strasbourg, France
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Urbán D, Cserni T, Boros M, Juhász Á, Érces D, Varga G. Bladder augmentation from an insider's perspective: a review of the literature on microcirculatory studies. Int Urol Nephrol 2021; 53:2221-2230. [PMID: 34435307 DOI: 10.1007/s11255-021-02971-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/03/2021] [Indexed: 02/07/2023]
Abstract
Augmentation cystoplasty is an exemplary multiorgan intervention in urology which is particularly associated with microvascular damage. Our aim was to review the available intravital imaging techniques and data obtained from clinical and experimental microcirculatory studies involving the most important donor organs applied in bladder augmentation. Although numerous direct or indirect methods are available to assess the condition of microvessels the implementation of microcirculatory diagnostic methods in humans is still challenging and the assessment of organ microcirculation in the operating theatre has limitations. Nevertheless, preclinical studies generally report good internal validity and although prospective human protocols with reduced variability are needed, a possible positive impact of microcirculatory diagnostics on the clinical outcomes of urologic surgery can be anticipated.
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Affiliation(s)
- Dániel Urbán
- Institute of Surgical Research, University of Szeged, Pulz u. 1., Szeged, 6724, Hungary.,Department of General and Thoracic Surgery, Hetényi Géza County Hospital, Tószegi u. 21., Szolnok, 5000, Hungary
| | - Tamás Cserni
- Institute of Surgical Research, University of Szeged, Pulz u. 1., Szeged, 6724, Hungary.,Department of Paediatric Urology, The Royal Manchester Children's Hospital, Oxford Road, Manchester, M13 9WL, UK
| | - Mihály Boros
- Institute of Surgical Research, University of Szeged, Pulz u. 1., Szeged, 6724, Hungary
| | - Árpád Juhász
- Department of General and Thoracic Surgery, Hetényi Géza County Hospital, Tószegi u. 21., Szolnok, 5000, Hungary
| | - Dániel Érces
- Institute of Surgical Research, University of Szeged, Pulz u. 1., Szeged, 6724, Hungary
| | - Gabriella Varga
- Institute of Surgical Research, University of Szeged, Pulz u. 1., Szeged, 6724, Hungary.
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10
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Mizrachi A, Ben-Aharon I, Li H, Bar-Joseph H, Bodden C, Hikri E, Popovtzer A, Shalgi R, Haimovitz-Friedman A. Chemotherapy-induced acute vascular injury involves intracellular generation of ROS via activation of the acid sphingomyelinase pathway. Cell Signal 2021; 82:109969. [PMID: 33647448 PMCID: PMC10402763 DOI: 10.1016/j.cellsig.2021.109969] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 02/07/2023]
Abstract
Several categories of chemotherapy confer substantial risk for late-term vascular morbidity and mortality. In the present study, we aimed to investigate the mechanism of acute chemotherapy-induced vascular injury in normal tissues. Specifically, we looked at activation of the acid sphingomyelinase (ASMase)/ceramide pathway, which leads to generation of reactive oxygen species (ROS) and induction of oxidative stress that may result in vascular injury. In particular, we focused on two distinct drugs, doxorubicin (DOX) and cisplatin (CIS) and their effects on normal endothelial cells. In vitro, DOX resulted in increased ASMase activity, intra-cellular ROS production and induction of apoptosis. CIS treatment generated significantly reduced effects in endothelial cells. In-vivo, murine femoral arterial blood flow was measured in real-time, during and after DOX or CIS administration, using fluorescence optical imaging system. While DOX caused constriction of small vessels and disintegration of large vessels' wall, CIS induced minor vascular changes in arterial blood flow, correlating with the in vitro findings. These results demonstrate that DOX induces acute vascular injury by increased ROS production, via activation of ASMase/ceramide pathway, while CIS increases ROS production and its immediate extracellular translocation, without causing detectable acute vascular injury. Our findings may potentially lead to the development of new strategies to prevent long-term cardiovascular morbidity in cancer survivors.
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Affiliation(s)
- Aviram Mizrachi
- Head and Neck Service, Department of Surgery, Memorial Sloan-Kettering Cancer Center, New York, NY, USA; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Otorhinolaryngology Head and Neck Surgery and Center for Translational Research in Head and Neck Cancer, Rabin Medical Center, Petah Tikva, Israel
| | - Irit Ben-Aharon
- Division of Oncology, Rambam Health Care Campus, Haifa, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Hongyan Li
- Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA
| | - Hadas Bar-Joseph
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Chloe Bodden
- Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY, USA
| | - Elad Hikri
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Otorhinolaryngology Head and Neck Surgery and Center for Translational Research in Head and Neck Cancer, Rabin Medical Center, Petah Tikva, Israel
| | - Aron Popovtzer
- Division of Oncology, Rambam Health Care Campus, Haifa, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Otorhinolaryngology Head and Neck Surgery and Center for Translational Research in Head and Neck Cancer, Rabin Medical Center, Petah Tikva, Israel
| | - Ruth Shalgi
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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11
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Barberio M, Felli E, Pop R, Pizzicannella M, Geny B, Lindner V, Baiocchini A, Jansen-Winkeln B, Moulla Y, Agnus V, Marescaux J, Gockel I, Diana M. A Novel Technique to Improve Anastomotic Perfusion Prior to Esophageal Surgery: Hybrid Ischemic Preconditioning of the Stomach. Preclinical Efficacy Proof in a Porcine Survival Model. Cancers (Basel) 2020; 12:cancers12102977. [PMID: 33066529 PMCID: PMC7602144 DOI: 10.3390/cancers12102977] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/05/2020] [Accepted: 10/12/2020] [Indexed: 12/24/2022] Open
Abstract
Simple Summary Esophagectomy has a high rate of anastomotic complications thought to be caused by poor perfusion of the gastric graft, which is used to restore the continuity of the gastrointestinal tract. Ischemic gastric preconditioning (IGP), performed by partially destroying preoperatively the gastric vessels either by means of interventional radiology or surgically, might improve the gastric conduit perfusion. Both approaches have downsides. The timing, extent and mechanism of IGP remain unclear. A novel hybrid IGP method combining the advantages of the endovascular and surgical approach was introduced in this study. IGP improves unequivocally the mucosal and serosal blood-flow at the gastric conduit fundus by triggering new vessels formation. The proposed timing and extent of IGP were efficacious and might be easily applied to humans. This novel minimally invasive IGP technique might reduce the anastomotic leak rate of patients undergoing esophagectomy, thus improving their overall oncological outcome. Abstract Esophagectomy often presents anastomotic leaks (AL), due to tenuous perfusion of gastric conduit fundus (GCF). Hybrid (endovascular/surgical) ischemic gastric preconditioning (IGP), might improve GCF perfusion. Sixteen pigs undergoing IGP were randomized: (1) Max-IGP (n = 6): embolization of left gastric artery (LGA), right gastric artery (RGA), left gastroepiploic artery (LGEA), and laparoscopic division (LapD) of short gastric arteries (SGA); (2) Min-IGP (n = 5): LGA-embolization, SGA-LapD; (3) Sham (n = 5): angiography, laparoscopy. At day 21 gastric tubulation occurred and GCF perfusion was assessed as: (A) Serosal-tissue-oxygenation (StO2) by hyperspectral-imaging; (B) Serosal time-to-peak (TTP) by fluorescence-imaging; (C) Mucosal functional-capillary-density-area (FCD-A) index by confocal-laser-endomicroscopy. Local capillary lactates (LCL) were sampled. Neovascularization was assessed (histology/immunohistochemistry). Sham presented lower StO2 and FCD-A index (41 ± 10.6%; 0.03 ± 0.03 respectively) than min-IGP (66.2 ± 10.2%, p-value = 0.004; 0.22 ± 0.02, p-value < 0.0001 respectively) and max-IGP (63.8 ± 9.4%, p-value = 0.006; 0.2 ± 0.02, p-value < 0.0001 respectively). Sham had higher LCL (9.6 ± 4.8 mL/mol) than min-IGP (4 ± 3.1, p-value = 0.04) and max-IGP (3.4 ± 1.5, p-value = 0.02). For StO2, FCD-A, LCL, max- and min-IGP did not differ. Sham had higher TTP (24.4 ± 4.9 s) than max-IGP (10 ± 1.5 s, p-value = 0.0008) and min-IGP (14 ± 1.7 s, non-significant). Max- and min-IGP did not differ. Neovascularization was confirmed in both IGP groups. Hybrid IGP improves GCF perfusion, potentially reducing post-esophagectomy AL.
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Affiliation(s)
- Manuel Barberio
- IHU-Strasbourg, Institute of Image-Guided Surgery, 67000 Strasbourg, France; (E.F.); (R.P.); (M.P.); (V.A.)
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, 4107 Leipzig, Germany; (B.J.-W.); (Y.M.); (I.G.)
- Physiology Institute, EA 3072, University of Strasbourg, 67000 Strasbourg, France;
- Correspondence:
| | - Eric Felli
- IHU-Strasbourg, Institute of Image-Guided Surgery, 67000 Strasbourg, France; (E.F.); (R.P.); (M.P.); (V.A.)
- Physiology Institute, EA 3072, University of Strasbourg, 67000 Strasbourg, France;
| | - Raoul Pop
- IHU-Strasbourg, Institute of Image-Guided Surgery, 67000 Strasbourg, France; (E.F.); (R.P.); (M.P.); (V.A.)
| | - Margherita Pizzicannella
- IHU-Strasbourg, Institute of Image-Guided Surgery, 67000 Strasbourg, France; (E.F.); (R.P.); (M.P.); (V.A.)
| | - Bernard Geny
- Physiology Institute, EA 3072, University of Strasbourg, 67000 Strasbourg, France;
| | - Veronique Lindner
- Department of Pathology, University Hospital of Strasbourg, 67000 Strasbourg, France;
| | - Andrea Baiocchini
- Department of Surgical Pathology, San Camillo Hospital, 00152 Rome, Italy;
| | - Boris Jansen-Winkeln
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, 4107 Leipzig, Germany; (B.J.-W.); (Y.M.); (I.G.)
| | - Yusef Moulla
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, 4107 Leipzig, Germany; (B.J.-W.); (Y.M.); (I.G.)
| | - Vincent Agnus
- IHU-Strasbourg, Institute of Image-Guided Surgery, 67000 Strasbourg, France; (E.F.); (R.P.); (M.P.); (V.A.)
| | - Jacques Marescaux
- Research Institute against Digestive Cancer (IRCAD), 67000 Strasbourg, France; (J.M.); (M.D.)
| | - Ines Gockel
- Department of Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, 4107 Leipzig, Germany; (B.J.-W.); (Y.M.); (I.G.)
| | - Michele Diana
- Research Institute against Digestive Cancer (IRCAD), 67000 Strasbourg, France; (J.M.); (M.D.)
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12
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Barberio M, Felli E, Pizzicannella M, Agnus V, Al-Taher M, Seyller E, Moulla Y, Jansen-Winkeln B, Gockel I, Marescaux J, Diana M. Quantitative serosal and mucosal optical imaging perfusion assessment in gastric conduits for esophageal surgery: an experimental study in enhanced reality. Surg Endosc 2020; 35:5827-5835. [PMID: 33026514 PMCID: PMC8437861 DOI: 10.1007/s00464-020-08077-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 10/01/2020] [Indexed: 12/19/2022]
Abstract
Abstract
Introduction/objective
Gastric conduit (GC) is used for reconstruction after esophagectomy. Anastomotic leakage (AL) incidence remains high, given the extensive disruption of the gastric circulation. Currently, there is no reliable method to intraoperatively quantify gastric perfusion. Hyperspectral imaging (HSI) has shown its potential to quantify serosal StO2. Confocal laser endomicroscopy (CLE) allows for automatic mucosal microcirculation quantification as functional capillary density area (FCD-A). The aim of this study was to quantify serosal and mucosal GC’s microperfusion using HSI and CLE. Local capillary lactate (LCL) served as biomarker.
Methods
GC was formed in 5 pigs and serosal StO2% was quantified at 3 regions of interest (ROI) using HSI: fundus (ROI-F), greater curvature (ROI-C), and pylorus (ROI-P). After intravenous injection of sodium-fluorescein (0.5 g), CLE-based mucosal microperfusion was assessed at the corresponding ROIs, and LCLs were quantified via a lactate analyzer.
Results
StO2 and FCD-A at ROI-F (41 ± 10.6%, 3.3 ± 3.8, respectively) were significantly lower than ROI-C (68.2 ± 6.7%, p value: 0.005; 18.4 ± 7, p value: 0.01, respectively) and ROI-P (72 ± 10.4%, p value: 0.005; 15.7 ± 3.2 p value: 0.001). LCL value at ROI-F (9.6 ± 4.7 mmol/L) was significantly higher than at ROI-C (2.6 ± 1.2 mmol/L, p value: 0.04) and ROI-P (2.6 ± 1.3 mmol/L, p value: 0.04). No statistically significant difference was found in all metrics between ROI-C and ROI-P. StO2 correlated with FCD-A (Pearson’s r = 0.67). The LCL correlated negatively with both FCD-A (Spearman’s r = − 0.74) and StO2 (Spearman’s r = − 0.54).
Conclusions
GC formation causes a drop in serosal and mucosal fundic perfusion. HSI and CLE correlate well and might become useful intraoperative tools.
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13
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Endoscopic Optical Imaging Technologies and Devices for Medical Purposes: State of the Art. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10196865] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The growth and development of optical components and, in particular, the miniaturization of micro-electro-mechanical systems (MEMSs), has motivated and enabled researchers to design smaller and smaller endoscopes. The overarching goal of this work has been to image smaller previously inaccessible luminal organs in real time, at high resolution, in a minimally invasive manner that does not compromise the comfort of the subject, nor introduce additional risk. Thus, an initial diagnosis can be made, or a small precancerous lesion may be detected, in a small-diameter luminal organ that would not have otherwise been possible. Continuous advancement in the field has enabled a wide range of optical scanners. Different scanning techniques, working principles, and the applications of endoscopic scanners are summarized in this review.
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14
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Li G, Duan X, Lee M, Birla M, Chen J, Oldham KR, Wang TD, Li H. Ultra-Compact Microsystems-Based Confocal Endomicroscope. IEEE TRANSACTIONS ON MEDICAL IMAGING 2020; 39:2406-2414. [PMID: 32012007 PMCID: PMC7918297 DOI: 10.1109/tmi.2020.2971476] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Point-of-care medical diagnosis demands immediate feedback on tissue pathology. Confocal endomicroscopy can provide real-time in vivo images with histology-like features. The working channel in medical endoscopes are becoming smaller in dimension. Microsystems methods can produce tiny mechanical scanners. We demonstrate a flexible fiber instrument for in vivo imaging as an endoscope accessory. The optical path is folded on-axis to reduce length while allowing the beam to expand and achieve a numerical aperture of 0.41. A high-speed parametric resonance mirror produces large deflection angles > 13°, and is mounted on a 2 mm diameter chip designed with clamp structures for reduced space. A compact lens assembly provides diffraction-limited lateral and axial resolution of 1.5 and [Formula: see text], respectively. A working distance of [Formula: see text] and field-of-view of [Formula: see text] m are achieved. Miniature apparatus is fabricated to assemble and align the scanhead components. The optics and scanner are packaged in a distal tip with 2.4 mm diameter and 10 mm rigid length. These dimensions allow the endomicroscope to pass forward easily through the 2.8 mm diameter working channel in medical endoscopes commonly used in clinical practice. Fluorescence images are collected in vivo at 10 frames per second in the colon of genetically-engineered mice that spontaneously develop adenomas. A FITC-labeled peptide heterodimer is administered intravenously to provide specific contrast. Sub-cellular structures are visualized to distinguish pre-malignant from normal mucosa. These results demonstrate use of microsystems methods to produce an ultra-compact instrument with sufficiently small dimensions for broad use.
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15
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Wang Q, Qian B, Schäfer M, Groß W, Mehrabi A, Ryschich E. Fluorescence-guided fiber-optic micronavigation using microscopic identification of vascular boundary of liver segment and tumors. Theranostics 2020; 10:6136-6148. [PMID: 32483444 PMCID: PMC7255018 DOI: 10.7150/thno.45973] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 04/10/2020] [Indexed: 12/25/2022] Open
Abstract
Background: The exact identification of tumor boundaries and related liver segments is especially important for liver tumor surgery. This study aimed to evaluate a new approach for vascular boundary assessment and surgical navigation based on fiber-optic microscopy and microvascular fluorescence labeling. Methods: Antibody clones with fast binding ability were identified and selected using immunofluorescence. We evaluated the endothelial capture efficacy for an anti-mouse CD31 antibody labeled with different fluorophores and different degrees of labeling ex vivo. Segment boundary identification and navigation potential using endothelial capture were explored by two different fiber-optic microscopy systems. Finally, microvasculature labeling and fiber-optic microscopy were used to identify and treat microscopic liver tumors in vivo. Results: The following monoclonal antibodies were selected: anti-mouse CD31 (clone 390), anti-mouse CD54 (YN1/1.7.4), anti-human CD31 (WM59), and anti-human CD54 (HA58). These clones showed fast binding to endothelial cells and had long half-lives. The fluorophore choice and the degree of antibody labeling did not significantly affect capture efficacy in an isolated liver perfusion model. The microvascular system was clearly identified with wide-field fiber-optic microscopy after labeling the endothelium with low doses of specific antibodies, and the specifically labeled liver segment could be microscopically dissected. High antibody doses were required for confocal laser endomicroscopy. After microscopically identifying the vascular margin in vivo, tumor thermoablation strongly reduced tumor size or totally eliminated tumors. Conclusions: We demonstrated that vascular boundaries of liver tumors and locally perfused liver segments were accurately identified and surgical micronavigation was facilitated with fiber-optic microscopy and selected endothelium-specific antibodies.
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16
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Thrapp AD, Hughes MR. Automatic motion compensation for structured illumination endomicroscopy using a flexible fiber bundle. JOURNAL OF BIOMEDICAL OPTICS 2020; 25:1-13. [PMID: 32100492 PMCID: PMC7040435 DOI: 10.1117/1.jbo.25.2.026501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 01/21/2020] [Indexed: 05/13/2023]
Abstract
SIGNIFICANCE Confocal laser scanning enables optical sectioning in clinical fiber bundle endomicroscopes, but lower-cost, simplified endomicroscopes use widefield incoherent illumination instead. Optical sectioning can be introduced in these simple systems using structured illumination microscopy (SIM), a multiframe digital subtraction process. However, SIM results in artifacts when the probe is in motion, making the technique difficult to use in vivo and preventing the use of mosaicking to synthesize a larger effective field of view (FOV). AIM We report and validate an automatic motion compensation technique to overcome motion artifacts and allow generation of mosaics in SIM endomicroscopy. APPROACH Motion compensation is achieved using image registration and real-time pattern orientation correction via a digital micromirror device. We quantify the similarity of moving probe reconstructions to those acquired with a stationary probe using the relative mean of the absolute differences (MAD). We further demonstrate mosaicking with a moving probe in mechanical and freehand operation. RESULTS Reconstructed SIM images show an improvement in the MAD from 0.85 to 0.13 for lens paper and from 0.27 to 0.12 for bovine tissue. Mosaics also show vastly reduced artifacts. CONCLUSION The reduction in motion artifacts in individual SIM reconstructions leads to mosaics that more faithfully represent the morphology of tissue, giving clinicians a larger effective FOV than the probe itself can provide.
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Affiliation(s)
- Andrew D. Thrapp
- University of Kent, School of Physical Sciences, Applied Optics Group, Canterbury, United Kingdom
- Address all correspondence to Andrew D. Thrapp, E-mail:
| | - Michael R. Hughes
- University of Kent, School of Physical Sciences, Applied Optics Group, Canterbury, United Kingdom
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17
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Multiplexed Remote SPR Detection of Biological Interactions through Optical Fiber Bundles. SENSORS 2020; 20:s20020511. [PMID: 31963277 PMCID: PMC7014493 DOI: 10.3390/s20020511] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/08/2020] [Accepted: 01/14/2020] [Indexed: 02/04/2023]
Abstract
The development of sensitive methods for in situ detection of biomarkers is a real challenge to bring medical diagnosis a step forward. The proof-of-concept of a remote multiplexed biomolecular interaction detection through a plasmonic optical fiber bundle is demonstrated here. The strategy relies on a fiber optic biosensor designed from a 300 µm diameter bundle composed of 6000 individual optical fibers. When appropriately etched and metallized, each optical fiber exhibits specific plasmonic properties. The surface plasmon resonance phenomenon occurring at the surface of each fiber enables to measure biomolecular interactions, through the changes of the retro-reflected light intensity due to light/plasmon coupling variations. The functionalization of the microstructured bundle by multiple protein probes was performed using new polymeric 3D-printed microcantilevers. Such soft cantilevers allow for immobilizing the probes in micro spots, without damaging the optical microstructures nor the gold layer. We show here the potential of this device to perform the multiplexed detection of two different antibodies with limits of detection down to a few tenths of nanomoles per liter. This tool, adapted for multiparametric, real-time, and label free monitoring is minimally invasive and could then provide a useful platform for in vivo targeted molecular analysis.
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18
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Zhou Y, Qiu L, Wang H, Chen X. Induction of activity synchronization among primed hippocampal neurons out of random dynamics is key for trace memory formation and retrieval. FASEB J 2020; 34:3658-3676. [PMID: 31944374 PMCID: PMC7079015 DOI: 10.1096/fj.201902274r] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Revised: 12/02/2019] [Accepted: 12/15/2019] [Indexed: 01/07/2023]
Abstract
Memory is thought to be encoded by sparsely distributed neuronal ensembles in memory‐related regions. However, it is unclear how memory‐eligible neurons react during learning to encode trace fear memory and how they retrieve a memory. We implemented a fiber‐optic confocal fluorescence endomicroscope to directly visualize calcium dynamics of hippocampal CA1 neurons in freely behaving mice subjected to trace fear conditioning. Here we report that the overall activity levels of CA1 neurons showed a right‐skewed lognormal distribution, with a small portion of highly active neurons (termed Primed Neurons) filling the long‐tail. Repetitive training induced Primed Neurons to shift from random activity to well‐tuned synchronization. The emergence of activity synchronization coincided with the appearance of mouse freezing behaviors. In recall, a partial synchronization among the same subset of Primed Neurons was induced from random dynamics, which also coincided with mouse freezing behaviors. Additionally, training‐induced synchronization facilitated robust calcium entry into Primed Neurons. In contrast, most CA1 neurons did not respond to tone and foot shock throughout the training and recall cycles. In conclusion, Primed Neurons are preferably recruited to encode trace fear memory and induction of activity synchronization among Primed Neurons out of random dynamics is critical for trace memory formation and retrieval.
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Affiliation(s)
- Yuxin Zhou
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH, USA
| | - Liyan Qiu
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH, USA
| | - Haiying Wang
- Department of Statistics, University of Connecticut, Storrs, CT, USA
| | - Xuanmao Chen
- Department of Molecular, Cellular and Biomedical Sciences, University of New Hampshire, Durham, NH, USA
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19
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Ehrlich K, Parker HE, McNicholl DK, Reid P, Reynolds M, Bussiere V, Crawford G, Deighan A, Garrett A, Kufcsák A, Norberg DR, Spennati G, Steele G, Szoor-McElhinney H, Jimenez M. Demonstrating the Use of Optical Fibres in Biomedical Sensing: A Collaborative Approach for Engagement and Education. SENSORS (BASEL, SWITZERLAND) 2020; 20:E402. [PMID: 31936827 PMCID: PMC7014119 DOI: 10.3390/s20020402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 12/19/2019] [Accepted: 12/23/2019] [Indexed: 12/29/2022]
Abstract
This paper demonstrates how research at the intersection of physics, engineering, biology and medicine can be presented in an interactive and educational way to a non-scientific audience. Interdisciplinary research with a focus on prevalent diseases provides a relatable context that can be used to engage with the public. Respiratory diseases are significant contributors to avoidable morbidity and mortality and have a growing social and economic impact. With the aim of improving lung disease understanding, new techniques in fibre-based optical endomicroscopy have been recently developed. Here, we present a novel engagement activity that resembles a bench-to-bedside pathway. The activity comprises an inexpensive educational tool (<$70) adapted from a clinical optical endomicroscopy system and tutorials that cover state-of-the-art research. The activity was co-created by high school science teachers and researchers in a collaborative way that can be implemented into any engagement development process.
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Affiliation(s)
- Katjana Ehrlich
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Helen E. Parker
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Duncan K. McNicholl
- Scottish Universities Physics Alliance (SUPA), Institute of Photonics and Quantum Science, Heriot-Watt University, Edinburgh EH14 4AS, UK;
| | - Peter Reid
- College of Science and Engineering Engagement Team, King’s Buildings, University of Edinburgh, Edinburgh EH9 3BF, UK; (P.R.); (M.R.)
| | - Mark Reynolds
- College of Science and Engineering Engagement Team, King’s Buildings, University of Edinburgh, Edinburgh EH9 3BF, UK; (P.R.); (M.R.)
| | - Vincent Bussiere
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
| | | | | | - Alice Garrett
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
| | - András Kufcsák
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Dominic R. Norberg
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Giulia Spennati
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
| | - Gregor Steele
- Scottish Schools Education Research Centre (SSERC), Dunfermline KY11 8UU, UK;
| | - Helen Szoor-McElhinney
- EPSRC IRC Hub in Optical Molecular Sensing & Imaging, Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh EH16 4TJ, UK; (A.K.); (D.R.N.); (H.S.-M.)
| | - Melanie Jimenez
- James Watt School of Engineering, Biomedical Engineering Division, University of Glasgow, Glasgow G12 8LT, UK; (V.B.); (A.G.); (G.S.); (M.J.)
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Al-Gubory KH. Shedding light on fibered confocal fluorescence microscopy: Applications in biomedical imaging and therapies. JOURNAL OF BIOPHOTONICS 2019; 12:e201900146. [PMID: 31343844 DOI: 10.1002/jbio.201900146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/20/2019] [Accepted: 07/23/2019] [Indexed: 06/10/2023]
Abstract
Discoveries of major importance in life sciences and preclinical research are linked to the invention of microscopes that enable imaging of cells and their microstructures. Imaging technologies involving in vivo procedures using fluorescent dyes that permit labelling of cells have been developed over the last two decades. Fibered confocal fluorescence microscopy (FCFM) is an imaging technology equipped with fiber-optic probes to deliver light to organs and tissues of live animals. This enables not only in vivo detection of fluorescent signals and visualization of cells, but also the study of dynamic processes, such cell proliferation, apoptosis and angiogenesis, under physiological and pathological conditions. This will allow the diagnosis of diseased organs and tissues and the evaluation of the efficacy of new therapies in animal models of human diseases. The aim of this report is to shed light on FCFM and its potential medical applications and discusses some factors that compromise the reliability and reproducibility of monitoring biological processes by FCFM. This report also highlights the issues concerning animal experimentation and welfare, and the contributions of FCFM to the 3Rs principals, replacement, reduction and refinement.
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Affiliation(s)
- Kaïs H Al-Gubory
- National Institute for Agricultural Research, Department of Animal Physiology, Jouy-en-Josas, France
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21
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Y Lin K, Mosaed S. Ab Externo Imaging of Human Episcleral Vessels Using Fiberoptic Confocal Laser Endomicroscopy. J Ophthalmic Vis Res 2019; 14:275-284. [PMID: 31660106 PMCID: PMC6815344 DOI: 10.18502/jovr.v14i3.4783] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 02/18/2019] [Indexed: 11/24/2022] Open
Abstract
Purpose There is a growing interest in targeting minimally invasive surgery devices to the aqueous outflow system to optimize treatment outcomes. However, methods to visualize functioning, large-caliber aqueous and episcleral veins in-vivo are lacking. This pilot study establishes an ex-vivo system to evaluate the use of a confocal laser microendoscope to noninvasively image episcleral vessels and quantify regional flow variation along the limbal circumference. Methods A fiber-optic confocal laser endomicroscopy (CLE) system with lateral and axial resolution of 3.5 μm and 15 μm, respectively, was used on three porcine and four human eyes. Diluted fluorescein (0.04%) was injected into eyes kept under constant infusion. The microprobe was applied to the sclera 1 mm behind the limbus to acquire real-time video. Image acquisition was performed at 15-degree intervals along the limbal circumference to quantify regional flow variation in human eyes. Results Vascular structures were visualized in whole human eyes without processing. Schlemm's canal was visualized only after a scleral flap was created. Fluorescent signal intensity and vessel diameter variation were observed along the limbal circumference, with the inferior quadrant having a statistically higher fluorescein signal compared to the other quadrants in human eyes (P < 0.05). Conclusion This study demonstrates for the first time that the fiber-optic CLE platform can visualize the episcleral vasculature with high resolution ex-vivo with minimal tissue manipulation. Intravascular signal intensities and vessel diameters were acquired in real-time; such information can help select target areas for minimally invasive glaucoma surgery (MIGS) to achieve greater intraocular pressure reduction.
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Affiliation(s)
- Ken Y Lin
- Gavin Herbert Eye Institute, Department of Ophthalmology, University of California, Irvine, USA
| | - Sameh Mosaed
- Gavin Herbert Eye Institute, Department of Ophthalmology, University of California, Irvine, USA
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22
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Orefice NS, Souchet B, Braudeau J, Alves S, Piguet F, Collaud F, Ronzitti G, Tada S, Hantraye P, Mingozzi F, Ducongé F, Cartier N. Real-Time Monitoring of Exosome Enveloped-AAV Spreading by Endomicroscopy Approach: A New Tool for Gene Delivery in the Brain. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2019; 14:237-251. [PMID: 31440523 PMCID: PMC6699252 DOI: 10.1016/j.omtm.2019.06.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/25/2018] [Accepted: 06/21/2019] [Indexed: 12/15/2022]
Abstract
Exosomes represent a strategy for optimizing the adeno-associated virus (AAV) toward the development of novel therapeutic options for neurodegenerative disorders. However, in vivo spreading of exosomes and AAVs after intracerebral administration is poorly understood. This study provides an assessment and comparison of the spreading into the brain of exosome-enveloped AAVs (exo-AAVs) or unassociated AAVs (std-AAVs) through in vivo optical imaging techniques like probe-based confocal laser endomicroscopy (pCLE) and ex vivo fluorescence microscopy. The std-AAV serotypes (AAV6 and AAV9) encoding the GFP were enveloped in exosomes and injected into the ipsilateral hippocampus. At 3 months post-injection, pCLE detected enhanced GFP expression of both exo-AAV serotypes in contralateral hemispheres compared to std-AAVs. Although sparse GFP-positive astrocytes were observed using exo-AAVs, our results show that the enhancement of the transgene expression resulting from exo-AAVs was largely restricted to neurons and oligodendrocytes. Our results suggest (1) the possibility of combining gene therapy with an endoscopic approach to enable tracking of exo-AAV spread, and (2) exo-AAVs allow for widespread, long-term gene expression in the CNS, supporting the use of exo-AAVs as an efficient gene delivery tool.
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Affiliation(s)
- Nicola Salvatore Orefice
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
| | - Benoît Souchet
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
| | - Jérôme Braudeau
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
| | - Sandro Alves
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
| | - Françoise Piguet
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
| | - Fanny Collaud
- INTEGRARE, Genethon, INSERM, Université Evry, Université Paris-Saclay, Evry 91002, France
| | - Giuseppe Ronzitti
- INTEGRARE, Genethon, INSERM, Université Evry, Université Paris-Saclay, Evry 91002, France
| | - Satoru Tada
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
| | - Philippe Hantraye
- CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France.,Neurodegenerative Diseases Laboratory, CNRS Laboratory of Neurodegenerative Diseases (UMR9199), Fontenay-aux-Roses 92265, France
| | - Federico Mingozzi
- INTEGRARE, Genethon, INSERM, Université Evry, Université Paris-Saclay, Evry 91002, France
| | - Frédéric Ducongé
- CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France.,Neurodegenerative Diseases Laboratory, CNRS CEA URA 2210, Fontenay-aux-Roses 92265, France
| | - Nathalie Cartier
- INSERM UMR1169, Université Paris-Sud, Université Paris-Saclay, Orsay 94100, France.,CEA, Fundamental Research Division (DRF), Institut of Biology Francois Jacob, Molecular Imaging Research Center (MIRCen), Fontenay-aux-Roses 92265, France
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23
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Li H, Hou X, Lin R, Fan M, Pang S, Jiang L, Liu Q, Fu L. Advanced endoscopic methods in gastrointestinal diseases: a systematic review. Quant Imaging Med Surg 2019; 9:905-920. [PMID: 31281783 DOI: 10.21037/qims.2019.05.16] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Endoscopic imaging is the main method for detecting gastrointestinal diseases, which adversely affect human health. White light endoscopy (WLE) was the first method used for endoscopic examination and is still the preliminary step in the detection of gastrointestinal diseases during clinical examination. However, it cannot accurately diagnose gastrointestinal diseases owing to its poor correlation with histopathological diagnosis. In recent years, many advanced endoscopic methods have emerged to improve the detection accuracy by endoscopy. Chromoendoscopy (CE) enhances the contrast between normal and diseased tissues using biocompatible dye agents. Narrow band imaging (NBI) can improve the contrast between capillaries and submucosal vessels by changing the light source acting on the tissue using special filters to realize the visualization of the vascular structure. Flexible spectral imaging color enhancement (FICE) technique uses the reflectance spectrum estimation technique to obtain individual spectral images and reconstructs an enhanced image of the mucosal surface using three selected spectral images. The i-Scan technology takes advantage of the different reflective properties of normal and diseased tissues to obtain images, and enhances image contrast through post-processing algorithms. These abovementioned methods can be used to detect gastrointestinal diseases by observing the macroscopic structure of the digestive tract mucosa, but the ability of early cancer detection is limited with low resolution. However, based on the principle of confocal imaging, probe-based confocal laser endomicroscopy (pCLE) can enable cellular visualization with high-performance probes, which can present cellular morphology that is highly consistent with that shown by biopsy to provide the possibility of early detection of cancer. Other endoscopic imaging techniques including endoscopic optical coherence tomography (EOCT) and photoacoustic endoscopy (PAE), are also promising for diagnosing gastrointestinal diseases. This review focuses on these technologies and aims to provide an overview of different technologies and their clinical applicability.
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Affiliation(s)
- Hua Li
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan 430074, China.,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xiaohua Hou
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Rong Lin
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Mengke Fan
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Suya Pang
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Longjie Jiang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan 430074, China.,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Qian Liu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan 430074, China.,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Ling Fu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan 430074, China.,MoE Key Laboratory for Biomedical Photonics, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan 430074, China
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24
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Wang J, Li H, Tian G, Deng Y, Liu Q, Fu L. Near-infrared probe-based confocal microendoscope for deep-tissue imaging. BIOMEDICAL OPTICS EXPRESS 2018; 9:5011-5025. [PMID: 30319918 PMCID: PMC6179400 DOI: 10.1364/boe.9.005011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 09/14/2018] [Accepted: 09/14/2018] [Indexed: 05/18/2023]
Abstract
In this work, a near-infrared probe-based confocal microendoscope (pCM) with a 785 nm laser source, a long working distance, and a probe with diameter of 2.6 mm that can be compatible with a conventional endoscope is demonstrated to produce deep-tissue images at cellular resolutions with enhanced contrast and signal-to-noise ratio. Theoretical simulations and experiments confirm that near-infrared light can optimize the image quality. Abundant details of mouse esophagus obtained at different depths demonstrate the system's ability to image deep tissues at cellular resolutions, which makes it possible to diagnose diseases in the digestive tract in real time, laying a solid foundation for clinical applications.
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Affiliation(s)
- Jiafu Wang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Hua Li
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Geng Tian
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Yong Deng
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Qian Liu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
| | - Ling Fu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
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Vyas K, Hughes M, Rosa BG, Yang GZ. Fiber bundle shifting endomicroscopy for high-resolution imaging. BIOMEDICAL OPTICS EXPRESS 2018; 9:4649-4664. [PMID: 30319893 PMCID: PMC6179396 DOI: 10.1364/boe.9.004649] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/27/2018] [Accepted: 07/29/2018] [Indexed: 05/20/2023]
Abstract
Flexible endomicroscopes commonly use coherent fiber bundles with high core densities to facilitate high-resolution in vivo imaging during endoscopic and minimally-invasive procedures. However, under-sampling due to the inter-core spacing limits the spatial resolution, making it difficult to resolve smaller cellular features. Here, we report a compact and rapid piezoelectric transducer (PZT) based bundle-shifting endomicroscopy system in which a super-resolution (SR) image is restored from multiple pixelation-limited images by computational means. A miniaturized PZT tube actuates the fiber bundle behind a GRIN micro-lens and a Delaunay triangulation based algorithm reconstructs an enhanced SR image. To enable real-time cellular-level imaging, imaging is performed using a line-scan confocal laser endomicroscope system with a raw frame rate of 120 fps, delivering up to 2 times spatial resolution improvement for a field of view of 350 µm at a net frame rate of 30 fps. The resolution enhancement is confirmed using resolution phantoms and ex vivo fluorescence endomicroscopy imaging of human breast specimens is demonstrated.
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Affiliation(s)
- Khushi Vyas
- Hamlyn Centre for Robotic Surgery, Imperial College London, South Kensington Campus, London SW7 2AZ,
UK
| | - Michael Hughes
- Applied Optics Group, School of Physical Sciences, University of Kent, Canterbury CT2 7NH,
UK
| | - Bruno Gil Rosa
- Hamlyn Centre for Robotic Surgery, Imperial College London, South Kensington Campus, London SW7 2AZ,
UK
| | - Guang-Zhong Yang
- Hamlyn Centre for Robotic Surgery, Imperial College London, South Kensington Campus, London SW7 2AZ,
UK
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26
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Aubreville M, Stoeve M, Oetter N, Goncalves M, Knipfer C, Neumann H, Bohr C, Stelzle F, Maier A. Deep learning-based detection of motion artifacts in probe-based confocal laser endomicroscopy images. Int J Comput Assist Radiol Surg 2018; 14:31-42. [DOI: 10.1007/s11548-018-1836-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 07/26/2018] [Indexed: 12/11/2022]
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27
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Microscopy. ACTA ACUST UNITED AC 2018. [DOI: 10.1007/978-3-319-96520-8_5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2023]
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28
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Position paper: The potential role of optical biopsy in the study and diagnosis of environmental enteric dysfunction. Nat Rev Gastroenterol Hepatol 2017; 14:727-738. [PMID: 29139480 DOI: 10.1038/nrgastro.2017.147] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Environmental enteric dysfunction (EED) is a disease of the small intestine affecting children and adults in low and middle income countries. Arising as a consequence of repeated infections, gut inflammation results in impaired intestinal absorptive and barrier function, leading to poor nutrient uptake and ultimately to stunting and other developmental limitations. Progress towards new biomarkers and interventions for EED is hampered by the practical and ethical difficulties of cross-validation with the gold standard of biopsy and histology. Optical biopsy techniques - which can provide minimally invasive or noninvasive alternatives to biopsy - could offer other routes to validation and could potentially be used as point-of-care tests among the general population. This Consensus Statement identifies and reviews the most promising candidate optical biopsy technologies for applications in EED, critically assesses them against criteria identified for successful deployment in developing world settings, and proposes further lines of enquiry. Importantly, many of the techniques discussed could also be adapted to monitor the impaired intestinal barrier in other settings such as IBD, autoimmune enteropathies, coeliac disease, graft-versus-host disease, small intestinal transplantation or critical care.
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29
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Duan X, Li H, Wang F, Li X, Oldham KR, Wang TD. Three-dimensional side-view endomicroscope for tracking individual cells in vivo. BIOMEDICAL OPTICS EXPRESS 2017; 8:5533-5545. [PMID: 29296486 PMCID: PMC5745101 DOI: 10.1364/boe.8.005533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 10/31/2017] [Accepted: 10/31/2017] [Indexed: 05/28/2023]
Abstract
We demonstrate a side-view endomicroscope using a monolithic 3-axis scanner placed in the post-objective position that performs either tilt or piston motion to achieve either optical scan angles >10° or large vertical displacements, respectively. This configuration allows for scaling down of instrument dimensions for high maneuverability and accurate positioning in vivo. Images exceeded either 700 × 600 μm2 in the horizontal plane or vertical depths of 200 μm. Resolution of 1.19 and 3.46 μm was obtained in the horizontal and oblique planes, respectively. Optical sections were collected from dysplastic colonic epithelium in vivo in mice that express tdTomato at 10 Hz to visualize individual cells.
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Affiliation(s)
- Xiyu Duan
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, MI 48109, USA
- These authors contributed equally to this work
| | - Haijun Li
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, MI 48109, USA
- These authors contributed equally to this work
| | - Fa Wang
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Xue Li
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Kenn R. Oldham
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Thomas D. Wang
- Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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30
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Belykh E, Yagmurlu K, Martirosyan NL, Lei T, Izadyyazdanabadi M, Malik KM, Byvaltsev VA, Nakaji P, Preul MC. Laser application in neurosurgery. Surg Neurol Int 2017; 8:274. [PMID: 29204309 PMCID: PMC5691557 DOI: 10.4103/sni.sni_489_16] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 08/18/2017] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Technological innovations based on light amplification created by stimulated emission of radiation (LASER) have been used extensively in the field of neurosurgery. METHODS We reviewed the medical literature to identify current laser-based technological applications for surgical, diagnostic, and therapeutic uses in neurosurgery. RESULTS Surgical applications of laser technology reported in the literature include percutaneous laser ablation of brain tissue, the use of surgical lasers in open and endoscopic cranial surgeries, laser-assisted microanastomosis, and photodynamic therapy for brain tumors. Laser systems are also used for intervertebral disk degeneration treatment, therapeutic applications of laser energy for transcranial laser therapy and nerve regeneration, and novel diagnostic laser-based technologies (e.g., laser scanning endomicroscopy and Raman spectroscopy) that are used for interrogation of pathological tissue. CONCLUSION Despite controversy over the use of lasers for treatment, the surgical application of lasers for minimally invasive procedures shows promising results and merits further investigation. Laser-based microscopy imaging devices have been developed and miniaturized to be used intraoperatively for rapid pathological diagnosis. The multitude of ways that lasers are used in neurosurgery and in related neuroclinical situations is a testament to the technological advancements and practicality of laser science.
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Affiliation(s)
- Evgenii Belykh
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
- Department of Neurosurgery, Irkutsk State Medical University, Irkutsk, Russia
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Kaan Yagmurlu
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Nikolay L. Martirosyan
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Ting Lei
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Mohammadhassan Izadyyazdanabadi
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
- School of Life Sciences, Arizona State University, Tempe, Arizona, USA
| | - Kashif M. Malik
- University of Arizona College of Medicine, Tucson, Arizona, USA
| | - Vadim A. Byvaltsev
- Department of Neurosurgery, Irkutsk State Medical University, Irkutsk, Russia
| | - Peter Nakaji
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
| | - Mark C. Preul
- Department of Neurosurgery, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona, USA
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Aubreville M, Knipfer C, Oetter N, Jaremenko C, Rodner E, Denzler J, Bohr C, Neumann H, Stelzle F, Maier A. Automatic Classification of Cancerous Tissue in Laserendomicroscopy Images of the Oral Cavity using Deep Learning. Sci Rep 2017; 7:11979. [PMID: 28931888 PMCID: PMC5607286 DOI: 10.1038/s41598-017-12320-8] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 09/07/2017] [Indexed: 12/15/2022] Open
Abstract
Oral Squamous Cell Carcinoma (OSCC) is a common type of cancer of the oral epithelium. Despite their high impact on mortality, sufficient screening methods for early diagnosis of OSCC often lack accuracy and thus OSCCs are mostly diagnosed at a late stage. Early detection and accurate outline estimation of OSCCs would lead to a better curative outcome and a reduction in recurrence rates after surgical treatment. Confocal Laser Endomicroscopy (CLE) records sub-surface micro-anatomical images for in vivo cell structure analysis. Recent CLE studies showed great prospects for a reliable, real-time ultrastructural imaging of OSCC in situ. We present and evaluate a novel automatic approach for OSCC diagnosis using deep learning technologies on CLE images. The method is compared against textural feature-based machine learning approaches that represent the current state of the art. For this work, CLE image sequences (7894 images) from patients diagnosed with OSCC were obtained from 4 specific locations in the oral cavity, including the OSCC lesion. The present approach is found to outperform the state of the art in CLE image recognition with an area under the curve (AUC) of 0.96 and a mean accuracy of 88.3% (sensitivity 86.6%, specificity 90%).
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Affiliation(s)
- Marc Aubreville
- Pattern Recognition Lab, Computer Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.
| | - Christian Knipfer
- Department of Oral and Maxillofacial Surgery, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Nicolai Oetter
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Christian Jaremenko
- Pattern Recognition Lab, Computer Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Erik Rodner
- Computer Vision Group, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - Joachim Denzler
- Computer Vision Group, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - Christopher Bohr
- Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Helmut Neumann
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,First Department of Internal Medicine, University Hospital Mainz, Johannes Gutenberg-Universität Mainz, Mainz, Germany
| | - Florian Stelzle
- Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Andreas Maier
- Pattern Recognition Lab, Computer Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.,Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
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Matz G, Messerschmidt B, Göbel W, Filser S, Betz CS, Kirsch M, Uckermann O, Kunze M, Flämig S, Ehrhardt A, Irion KM, Haack M, Dorostkar MM, Herms J, Gross H. Chip-on-the-tip compact flexible endoscopic epifluorescence video-microscope for in-vivo imaging in medicine and biomedical research. BIOMEDICAL OPTICS EXPRESS 2017; 8:3329-3342. [PMID: 28717570 PMCID: PMC5508831 DOI: 10.1364/boe.8.003329] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 06/15/2017] [Accepted: 06/15/2017] [Indexed: 05/17/2023]
Abstract
We demonstrate a 60 mg light video-endomicroscope with a cylindrical shape of the rigid tip of only 1.6 mm diameter and 6.7 mm length. A novel implementation method of the illumination unit in the endomicroscope is presented. It allows for the illumination of the biological sample with fiber-coupled LED light at 455 nm and the imaging of the red-shifted fluorescence light above 500 nm in epi-direction. A large numerical aperture of 0.7 leads to a sub-cellular resolution and yields to high-contrast images within a field of view of 160 μm. A miniaturized chip-on-the-tip CMOS image sensor with more than 150,000 pixels captures the multicolor images at 30 fps. Considering size, plug-and-play capability, optical performance, flexibility and weight, we hence present a probe which sets a new benchmark in the field of epifluorescence endomicroscopes. Several ex-vivo and in-vivo experiments in rodents and humans suggest future application in biomedical fields, especially in the neuroscience community, as well as in medical applications targeting optical biopsies or the detection of cellular anomalies.
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Affiliation(s)
- Gregor Matz
- GRINTECH GmbH, Schillerstrasse 1, 07743 Jena,
Germany
- Institute of Applied Physics, FSU Jena, Fürstengraben 1, 07737 Jena,
Germany
| | | | - Werner Göbel
- KARL STORZ GmbH & Co. KG, Mittelstrasse 8, 78532 Tuttlingen,
Germany
| | - Severin Filser
- LMU Munich, Geschwister-Scholl-Platz 1, 80539 Munich,
Germany
| | | | - Matthias Kirsch
- Neurosurgery, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, 01307 Dresden,
Germany
| | - Ortrud Uckermann
- Neurosurgery, University Hospital Carl Gustav Carus, TU Dresden, Fetscherstrasse 74, 01307 Dresden,
Germany
| | - Marcel Kunze
- GRINTECH GmbH, Schillerstrasse 1, 07743 Jena,
Germany
| | - Sven Flämig
- GRINTECH GmbH, Schillerstrasse 1, 07743 Jena,
Germany
| | - André Ehrhardt
- KARL STORZ GmbH & Co. KG, Mittelstrasse 8, 78532 Tuttlingen,
Germany
| | | | - Mareike Haack
- Klinikum Großhadern, Marchioninistr. 13, 81377 Munich,
Germany
| | | | - Jochen Herms
- LMU Munich, Geschwister-Scholl-Platz 1, 80539 Munich,
Germany
| | - Herbert Gross
- Institute of Applied Physics, FSU Jena, Fürstengraben 1, 07737 Jena,
Germany
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Miller MA, Weissleder R. Imaging the pharmacology of nanomaterials by intravital microscopy: Toward understanding their biological behavior. Adv Drug Deliv Rev 2017; 113:61-86. [PMID: 27266447 PMCID: PMC5136524 DOI: 10.1016/j.addr.2016.05.023] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 05/25/2016] [Indexed: 12/15/2022]
Abstract
Therapeutic nanoparticles (NPs) can deliver cytotoxic chemotherapeutics and other drugs more safely and efficiently to patients; furthermore, selective delivery to target tissues can theoretically be accomplished actively through coating NPs with molecular ligands, and passively through exploiting physiological "enhanced permeability and retention" features. However, clinical trial results have been mixed in showing improved efficacy with drug nanoencapsulation, largely due to heterogeneous NP accumulation at target sites across patients. Thus, a clear need exists to better understand why many NP strategies fail in vivo and not result in significantly improved tumor uptake or therapeutic response. Multicolor in vivo confocal fluorescence imaging (intravital microscopy; IVM) enables integrated pharmacokinetic and pharmacodynamic (PK/PD) measurement at the single-cell level, and has helped answer key questions regarding the biological mechanisms of in vivo NP behavior. This review summarizes progress to date and also describes useful technical strategies for successful IVM experimentation.
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Affiliation(s)
- Miles A Miller
- Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, Boston, MA 02114, USA
| | - Ralph Weissleder
- Center for Systems Biology, Massachusetts General Hospital, 185 Cambridge St, Boston, MA 02114, USA; Department of Systems Biology, Harvard Medical School, 200 Longwood Ave, Boston, MA 02115, USA.
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Abstract
Endomicroscopy is a new technique that allows human tissue to be characterized in vivo and in situ, circumventing the need for conventional biopsy and histology. Despite increased application and growing research interests in this area, the clinical application of endomicroscopy, however, is limited by difficulties in ergonomic control, consistent probe-tissue contact, large area surveillance, and retargeting. Recently, advances in high-speed imaging, mosaicing, and robotics have aimed to address these difficulties. The development of robot-assisted devices in particular has shown great promises in extending the clinical potential of endomicroscopy. Issues related to miniaturization, adaptation to tissue deformation, control stability, force and position compensation, cost, and sterility are being pursued by both research and commercial communities. In this review, recent clinical and technical developments in different aspects of computer and robotic assisted endomicroscopy interventions including instrumentation, multiscale integration, and high-speed imaging techniques are presented. We further address emerging trends and new research opportunities toward more widespread clinical acceptance of robotically assisted endomicroscopy technologies.
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Deep-brain imaging via epi-fluorescence Computational Cannula Microscopy. Sci Rep 2017; 7:44791. [PMID: 28317915 PMCID: PMC5357895 DOI: 10.1038/srep44791] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 02/14/2017] [Indexed: 11/15/2022] Open
Abstract
Here we demonstrate widefield (field diameter = 200 μm) fluorescence microscopy and video imaging inside the rodent brain at a depth of 2 mm using a simple surgical glass needle (cannula) of diameter 0.22 mm as the primary optical element. The cannula guides excitation light into the brain and the fluorescence signal out of the brain. Concomitant image-processing algorithms are utilized to convert the spatially scrambled images into fluorescent images and video. The small size of the cannula enables minimally invasive imaging, while the long length (>2 mm) allow for deep-brain imaging with no additional complexity in the optical system. Since no scanning is involved, widefield fluorescence video at the native frame rate of the camera can be achieved.
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36
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Echtler K, Konrad I, Lorenz M, Schneider S, Hofmaier S, Plenagl F, Stark K, Czermak T, Tirniceriu A, Eichhorn M, Walch A, Enders G, Massberg S, Schulz C. Platelet GPIIb supports initial pulmonary retention but inhibits subsequent proliferation of melanoma cells during hematogenic metastasis. PLoS One 2017; 12:e0172788. [PMID: 28253287 PMCID: PMC5333841 DOI: 10.1371/journal.pone.0172788] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2016] [Accepted: 02/09/2017] [Indexed: 01/27/2023] Open
Abstract
Platelets modulate the process of cancer metastasis. However, current knowledge on the direct interaction of platelets and tumor cells is mostly based on findings obtained in vitro. We addressed the role of the platelet fibrinogen receptor glycoprotein IIb (integrin αIIb) for experimental melanoma metastasis in vivo. Highly metastatic B16-D5 melanoma cells were injected intravenously into GPIIb-deficient (GPIIb-/-) or wildtype (WT) mice. Acute accumulation of tumor cells in the pulmonary vasculature was assessed in real-time by confocal videofluorescence microscopy. Arrest of tumor cells was dramatically reduced in GPIIb-/- mice as compared to WT. Importantly, we found that mainly multicellular aggregates accumulated in the pulmonary circulation of WT, instead B16-D5 aggregates were significantly smaller in GPIIb-/- mice. While pulmonary arrest of melanoma was clearly dependent on GPIIb in this early phase of metastasis, we also addressed tumor progression 10 days after injection. Inversely, and unexpectedly, we found that melanoma metastasis was now increased in GPIIb-/- mice. In contrast, GPIIb did not regulate local melanoma proliferation in a subcutaneous tumor model. Our data suggest that the platelet fibrinogen receptor has a differential role in the modulation of hematogenic melanoma metastasis. While platelets clearly support early steps in pulmonary metastasis via GPIIb-dependent formation of platelet-tumor-aggregates, at a later stage its absence is associated with an accelerated development of melanoma metastases.
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Affiliation(s)
- Katrin Echtler
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Ildiko Konrad
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Michael Lorenz
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Simon Schneider
- Medizinische Klinik, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Sebastian Hofmaier
- Medizinische Klinik, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Florian Plenagl
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Konstantin Stark
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Thomas Czermak
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Anca Tirniceriu
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Martin Eichhorn
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
- Chirurgische Klinik, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
| | - Axel Walch
- Research Unit Analytical Pathology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany
| | - Georg Enders
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Steffen Massberg
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
| | - Christian Schulz
- Medizinische Klinik und Poliklinik I, Klinikum der Universität, Ludwig-Maximilians-Universität, Munich, Germany
- Walter-Brendel-Zentrum für Experimentelle Medizin, Ludwig-Maximilians-Universität, Munich, Germany
- * E-mail:
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Andresen ER, Sivankutty S, Tsvirkun V, Bouwmans G, Rigneault H. Ultrathin endoscopes based on multicore fibers and adaptive optics: a status review and perspectives. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:121506. [PMID: 27722748 DOI: 10.1117/1.jbo.21.12.121506] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 09/12/2016] [Indexed: 05/06/2023]
Abstract
We take stock of the progress that has been made into developing ultrathin endoscopes assisted by wave front shaping. We focus our review on multicore fiber-based lensless endoscopes intended for multiphoton imaging applications. We put the work into perspective by comparing with alternative approaches and by outlining the challenges that lie ahead.
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Affiliation(s)
- Esben Ravn Andresen
- Aix-Marseille Université, Centre National de la Recherche Scientifique, Centrale Marseille, Institut Fresnel UMR 7249, Marseille 13013, FrancebUniversité Lille, UMR 8523, Laboratoire de Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - Siddharth Sivankutty
- Aix-Marseille Université, Centre National de la Recherche Scientifique, Centrale Marseille, Institut Fresnel UMR 7249, Marseille 13013, France
| | - Viktor Tsvirkun
- Aix-Marseille Université, Centre National de la Recherche Scientifique, Centrale Marseille, Institut Fresnel UMR 7249, Marseille 13013, France
| | - Géraud Bouwmans
- Université Lille, UMR 8523, Laboratoire de Physique des Lasers Atomes et Molécules, F-59000 Lille, France
| | - Hervé Rigneault
- Aix-Marseille Université, Centre National de la Recherche Scientifique, Centrale Marseille, Institut Fresnel UMR 7249, Marseille 13013, France
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38
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Precision real-time evaluation of bowel perfusion: accuracy of confocal endomicroscopy assessment of stoma in a controlled hemorrhagic shock model. Surg Endosc 2016; 31:680-691. [DOI: 10.1007/s00464-016-5022-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 06/03/2016] [Indexed: 12/16/2022]
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Matz G, Messerschmidt B, Gross H. Design and evaluation of new color-corrected rigid endomicroscopic high NA GRIN-objectives with a sub-micron resolution and large field of view. OPTICS EXPRESS 2016; 24:10987-1001. [PMID: 27409921 DOI: 10.1364/oe.24.010987] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We demonstrate new GRIN-based endomicroscopic objectives for high resolution single photon fluorescence imaging modalities. Two endoscopic optical design approaches are presented in detail utilizing firstly diffractive and secondly refractive optical elements for the color correction in a spectral range from 488 nm to 550 nm. They are compared with their precursor device experimentally and by simulation. Inherent aberrations for off-axis field points could be lowered remarkably compared with the values of the state-of-the-art system by increasing the intrinsic optical complexity but maintaining the outer spatial dimensions. As a result, those presented objectives predict a diffraction-limited imaging of objects up to 300 μm in diameter with a numerical aperture of 0.8 while keeping an overall outer diameter of the assembly at 1.4 mm. Lastly, confocal fluorescence imaging experiments focus on the comparison between the numerical predicted and the practically achieved quality parameters.
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40
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Sivankutty S, Andresen ER, Bouwmans G, Brown TG, Alonso MA, Rigneault H. Single-shot polarimetry imaging of multicore fiber. OPTICS LETTERS 2016; 41:2105-2108. [PMID: 27128085 DOI: 10.1364/ol.41.002105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report an experimental test of single-shot polarimetry applied to the problem of real-time monitoring of the output polarization states in each core within a multicore fiber bundle. The technique uses a stress-engineered optical element, together with an analyzer, and provides a point spread function whose shape unambiguously reveals the polarization state of a point source. We implement this technique to monitor, simultaneously and in real time, the output polarization states of up to 180 single-mode fiber cores in both conventional and polarization-maintaining fiber bundles. We demonstrate also that the technique can be used to fully characterize the polarization properties of each individual fiber core, including eigen-polarization states, phase delay, and diattenuation.
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41
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Krstajic N, Akram AR, Choudhary TR, McDonald N, Tanner MG, Pedretti E, Dalgarno PA, Scholefield E, Girkin JM, Moore A, Bradley M, Dhaliwal K. Two-color widefield fluorescence microendoscopy enables multiplexed molecular imaging in the alveolar space of human lung tissue. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:46009. [PMID: 27121475 DOI: 10.1117/1.jbo.21.4.046009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 03/24/2016] [Indexed: 05/20/2023]
Abstract
We demonstrate a fast two-color widefield fluorescence microendoscopy system capable of simultaneously detecting several disease targets in intact human ex vivo lung tissue. We characterize the system for light throughput from the excitation light emitting diodes, fluorescence collection efficiency, and chromatic focal shifts. We demonstrate the effectiveness of the instrument by imaging bacteria (Pseudomonas aeruginosa) in ex vivo human lung tissue. We describe a mechanism of bacterial detection through the fiber bundle that uses blinking effects of bacteria as they move in front of the fiber core providing detection of objects smaller than the fiber core and cladding (∼3 μm ∼3 μm ). This effectively increases the measured spatial resolution of 4 μm 4 μm . We show simultaneous imaging of neutrophils, monocytes, and fungus (Aspergillus fumigatus) in ex vivo human lung tissue. The instrument has 10 nM and 50 nM sensitivity for fluorescein and Cy5 solutions, respectively. Lung tissue autofluorescence remains visible at up to 200 fps camera acquisition rate. The optical system lends itself to clinical translation due to high-fluorescence sensitivity, simplicity, and the ability to multiplex several pathological molecular imaging targets simultaneously.
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Affiliation(s)
- Nikola Krstajic
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdombUniversity of Edinburgh, School of E
| | - Ahsan R Akram
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Tushar R Choudhary
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdomcHeriot-Watt University, Institute of
| | - Neil McDonald
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Michael G Tanner
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdomdHeriot-Watt University, Institute of
| | - Ettore Pedretti
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United KingdomcHeriot-Watt University, Institute of
| | - Paul A Dalgarno
- Heriot-Watt University, Institute of Biological Chemistry, Biophysics and Bioengineering, Edinburgh EH14 4AS, United Kingdom
| | - Emma Scholefield
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - John M Girkin
- Durham University, Biophysical Sciences Institute, Department of Physics, South Road, Durham DH1 3LE, United Kingdom
| | - Anne Moore
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Mark Bradley
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
| | - Kevin Dhaliwal
- University of Edinburgh, Queen's Medical Research Institute, MRC Centre for Inflammation Research, EPSRC IRC "Hub" in Optical Molecular Sensing and Imaging, 47 Little France Crescent, Edinburgh EH16 4TJ, United Kingdom
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Amitonova LV, Descloux A, Petschulat J, Frosz MH, Ahmed G, Babic F, Jiang X, Mosk AP, Russell PSJ, Pinkse PWH. High-resolution wavefront shaping with a photonic crystal fiber for multimode fiber imaging. OPTICS LETTERS 2016; 41:497-500. [PMID: 26907407 DOI: 10.1364/ol.41.000497] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
We demonstrate that a high-numerical-aperture photonic crystal fiber allows lensless focusing at an unparalleled resolution by complex wavefront shaping. This paves the way toward high-resolution imaging exceeding the capabilities of imaging with multi-core single-mode optical fibers. We analyze the beam waist and power in the focal spot on the fiber output using different types of fibers and different wavefront shaping approaches. We show that the complex wavefront shaping technique, together with a properly designed multimode photonic crystal fiber, enables us to create a tightly focused spot on the desired position on the fiber output facet with a subwavelength beam waist.
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Zuo S, Hughes M, Yang GZ. Novel Balloon Surface Scanning Device for Intraoperative Breast Endomicroscopy. Ann Biomed Eng 2015; 44:2313-26. [DOI: 10.1007/s10439-015-1493-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 10/22/2015] [Indexed: 12/12/2022]
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44
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Amitonova LV, Mosk AP, Pinkse PWH. Rotational memory effect of a multimode fiber. OPTICS EXPRESS 2015; 23:20569-75. [PMID: 26367909 DOI: 10.1364/oe.23.020569] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
We demonstrate the rotational memory effect in a multimode fiber. Rotating the incident wavefront around the fiber core axis leads to a rotation of the resulting pattern of the fiber output without significant changes in the resulting speckle pattern. The rotational memory effect can be exploited for non-invasive imaging or ultrafast high-resolution scanning through a multimode fiber. Our experiments demonstrate this effect over a full range of angles in two experimental configurations.
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Abstract
Mounting evidence suggests that a more extensive surgical resection is associated with an improved life expectancy for both low-grade and high-grade glioma patients. However, radiographically complete resections are not often achieved in many cases because of the lack of sensitivity and specificity of current neurosurgical guidance techniques at the margins of diffuse infiltrative gliomas. Intraoperative fluorescence imaging offers the potential to improve the extent of resection and to investigate the possible benefits of resecting beyond the radiographic margins. Here, we provide a review of wide-field and high-resolution fluorescence-imaging strategies that are being developed for neurosurgical guidance, with a focus on emerging imaging technologies and clinically viable contrast agents. The strengths and weaknesses of these approaches will be discussed, as well as issues that are being addressed to translate these technologies into the standard of care.
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Affiliation(s)
- Jonathan T C Liu
- *Department of Biomedical Engineering, Stony Brook University, Stony Brook, New York; ‡Barrow Brain Tumor Research Center, Division of Neurosurgical Oncology, Barrow Neurological Institute, St. Joseph's Hospital and Medical Center, Phoenix, Arizona
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46
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Fluorescence-Raman dual modal endoscopic system for multiplexed molecular diagnostics. Sci Rep 2015; 5:9455. [PMID: 25820115 PMCID: PMC4377550 DOI: 10.1038/srep09455] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Accepted: 03/05/2015] [Indexed: 12/20/2022] Open
Abstract
Optical endoscopic imaging, which was recently equipped with bioluminescence, fluorescence, and Raman scattering, allows minimally invasive real-time detection of pathologies on the surface of hollow organs. To characterize pathologic lesions in a multiplexed way, we developed a dual modal fluorescence-Raman endomicroscopic system (FRES), which used fluorescence and surface-enhanced Raman scattering nanoprobes (F-SERS dots). Real-time, in vivo, and multiple target detection of a specific cancer was successful, based on the fast imaging capability of fluorescence signals and the multiplex capability of simultaneously detected SERS signals using an optical fiber bundle for intraoperative endoscopic system. Human epidermal growth factor receptor 2 (HER2) and epidermal growth factor receptor (EGFR) on the breast cancer xenografts in a mouse orthotopic model were successfully detected in a multiplexed way, illustrating the potential of FRES as a molecular diagnostic instrument that enables real-time tumor characterization of receptors during routine endoscopic procedures.
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Bar-Joseph H, Stemmer SM, Tsarfaty I, Shalgi R, Ben-Aharon I. Chemotherapy-induced vascular toxicity--real-time in vivo imaging of vessel impairment. J Vis Exp 2015:e51650. [PMID: 25590564 DOI: 10.3791/51650] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Certain classes of chemotherapies may exert acute vascular changes that may progress into long-term conditions that may predispose the patient to an increased risk of vascular morbidity. Yet, albeit the mounting clinical evidence, there is a paucity of clear studies of vascular toxicity and therefore the etiology of a heterogeneous group of vascular/cardiovascular disorders remains to be elucidated. Moreover, the mechanism that may underlie vascular toxicity can completely differ from the principles of chemotherapy-induced cardiotoxicity, which is related to direct myocyte injury. We have established a real-time, in vivo molecular imaging platform to evaluate the potential acute vascular toxicity of anti-cancer therapies. We have set up a platform of in vivo, high-resolution molecular imaging in mice, suitable for visualizing vasculature within confined organs and reference blood vessels within the same individuals whereas each individual serve as its own control. Blood vessel walls were impaired after doxorubicin administration, representing a unique mechanism of vascular toxicity that may be the early event in end-organ injury. Herein, the method of fibered confocal fluorescent microscopy (FCFM) based imaging is described, which provides an innovative mode to understand physiological phenomena at the cellular and sub-cellular levels in animal subjects.
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Affiliation(s)
- Hadas Bar-Joseph
- Department of Cell and Developmental Biology, Tel Aviv University; Sackler Faculty of Medicine, Tel Aviv University
| | - Salomon Marcello Stemmer
- Sackler Faculty of Medicine, Tel Aviv University; Institute of Oncology, Davidoff Center and Rabin Medical Center
| | - Ilan Tsarfaty
- Sackler Faculty of Medicine, Tel Aviv University; Department of Clinical Microbiology and Immunology, Tel Aviv University
| | - Ruth Shalgi
- Department of Cell and Developmental Biology, Tel Aviv University; Sackler Faculty of Medicine, Tel Aviv University
| | - Irit Ben-Aharon
- Sackler Faculty of Medicine, Tel Aviv University; Institute of Oncology, Davidoff Center and Rabin Medical Center;
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Gore BB, Soden ME, Zweifel LS. Visualization of plasticity in fear-evoked calcium signals in midbrain dopamine neurons. ACTA ACUST UNITED AC 2014; 21:575-9. [PMID: 25320348 PMCID: PMC4201808 DOI: 10.1101/lm.036079.114] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Dopamine is broadly implicated in fear-related processes, yet we know very little about signaling dynamics in these neurons during active fear conditioning. We describe the direct imaging of calcium signals of dopamine neurons during Pavlovian fear conditioning using fiber-optic confocal microscopy coupled with the genetically encoded calcium indicator GCaMP3. We observed calcium transients in a subset of dopamine neurons to an unconditioned fear stimulus on the first day of Pavlovian fear conditioning. On the second day, calcium transients occurred in response to conditioned and unconditioned stimuli. These results demonstrate plasticity in dopamine neuron calcium signals and the occurrence of activity-dependent processes in these neurons during fear conditioning.
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Affiliation(s)
- Bryan B Gore
- Department of Pharmacology, University of Washington, Seattle, Washington 98053, USA Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, Washington 98053, USA
| | - Marta E Soden
- Department of Pharmacology, University of Washington, Seattle, Washington 98053, USA Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, Washington 98053, USA
| | - Larry S Zweifel
- Department of Pharmacology, University of Washington, Seattle, Washington 98053, USA Department of Psychiatry and Behavioral Sciences, University of Washington, Seattle, Washington 98053, USA
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Dietrich A, Stewart J, Huether M, Helm M, Schuetze C, Schnittler HJ, Jaffray DA, Kunz-Schughart LA. Macromolecule extravasation-xenograft size matters: a systematic study using probe-based confocal laser endomicroscopy (pCLE). Mol Imaging Biol 2014; 15:693-702. [PMID: 23632953 PMCID: PMC3826054 DOI: 10.1007/s11307-013-0641-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
PURPOSE Profound changes of the vasculature in tumors critically impact drug delivery and therapy response. We aimed at developing a procedure to monitor morphological and functional parameters of the vasculature in subcutaneous xenograft models commonly applied for therapy testing by using probe-based confocal laser endomicroscopy. PROCEDURES By monitoring various normal and diseased tissues, we established an experimental and analytical set-up to systematically analyze tracer extravasation from the microvasculature. Application of the approach in two xenograft models (HCT-116 and SW620) was realized consecutively throughout tumor growth. RESULTS The incidence of dilated vessels increased with xenograft size in both models while macromolecule extravasation and tracer accumulation in the tumor tissue, respectively, was significantly reduced throughout growth. The development of dilated/ultradilated vessels correlated with tracer extravasation only in the HCT-116 but not the SW620 model. The underlying mechanisms are still ambiguous and discussed. CONCLUSIONS Our findings clearly indicate that both xenograft type and size matter for drug delivery and therapy testing.
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Affiliation(s)
- Antje Dietrich
- />Tumor Pathophysiology, OncoRay—National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, Fetscherstraße 74, P.O. Box 41 , 01307 TU Dresden, Germany
| | - James Stewart
- />Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON Canada
| | - Melanie Huether
- />Tumor Pathophysiology, OncoRay—National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, Fetscherstraße 74, P.O. Box 41 , 01307 TU Dresden, Germany
| | - Mario Helm
- />Medical Radiation Physics, OncoRay—National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, TU Dresden, Germany
| | - Christina Schuetze
- />Experimental Radiotherapy and Radiobiology of Tumors, OncoRay—National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, TU Dresden, Germany
| | - Hans-Joachim Schnittler
- />Department of Anatomy and Cell Biology, Institute of Anatomy, University of Muenster, Muenster, Germany
| | - David A. Jaffray
- />Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON Canada
- />Radiation Medicine Program, Princess Margaret Hospital/Ontario Cancer Institute, University Health Network, Toronto, ON Canada
| | - Leoni A. Kunz-Schughart
- />Tumor Pathophysiology, OncoRay—National Center for Radiation Research in Oncology, Medical Faculty Carl Gustav Carus, Fetscherstraße 74, P.O. Box 41 , 01307 TU Dresden, Germany
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Probe-based confocal laser endomicroscopy and fluorescence-based enhanced reality for real-time assessment of intestinal microcirculation in a porcine model of sigmoid ischemia. Surg Endosc 2014; 28:3224-33. [PMID: 24935199 DOI: 10.1007/s00464-014-3595-6] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 05/06/2014] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND AIM Surgeons currently rely on visual clues to estimate the presence of sufficient vascularity for safe anastomosis. We aimed to assess the accuracy of endoluminal confocal laser endomicroscopy (CLE) and laparoscopic fluorescence-based enhanced reality (FLER), using near-infrared imaging and fluorescence from injected Indocyanine Green, to identify the transition from ischemic to vascular areas in a porcine model of mesenteric ischemia. METHODS Six pigs underwent 1-h sigmoid segmental ischemia. The ischemic area was evaluated by clinical assessment and FLER to determine presumed viable margins. For each sigmoid colon, 5 regions of interest (ROIs) were identified: ischemic (ROI 1), presumed viable margins ROI 2a (distal) and 2b (proximal), and vascular areas 3a (distal) and 3b (proximal). After injection of fluorescein, CLE scanning of the mucosa from the ischemic area toward viable margins was performed. Capillary blood samples were obtained by puncturing the serosa at the ROIs, and capillary lactates were measured with the EDGE(®) analyzer. RESULTS Capillary lactates were significantly higher at ROI 1 (4.91 mmol/L) when compared to resection margins (2.8 mmol/L; mean difference: 2.11; p < 0.05) identified by FLER. There was no significant difference in lactates between ROI1 and resection margins identified by clinical evaluation. In 50 % of cases, ROI 2aCLINIC-2bCLINIC were considered to match (<1 cm distance) with ROI 2aFLER-2bFLER. Confocal analysis revealed specific clues to identify the transition from ischemic to viable areas corresponding to those assessed by FLER in 11/12 cases versus 7/12 for those identified by clinical evaluation. CONCLUSIONS In this experimental model, FLER and CLE were more accurate than clinical evaluation to delineate bowel vascularization.
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