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Yu Y, Feng T, Qiu H, Gu Y, Chen Q, Zuo C, Ma H. Simultaneous photoacoustic and ultrasound imaging: A review. ULTRASONICS 2024; 139:107277. [PMID: 38460216 DOI: 10.1016/j.ultras.2024.107277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 01/09/2024] [Accepted: 02/26/2024] [Indexed: 03/11/2024]
Abstract
Photoacoustic imaging (PAI) is an emerging biomedical imaging technique that combines the advantages of optical and ultrasound imaging, enabling the generation of images with both optical resolution and acoustic penetration depth. By leveraging similar signal acquisition and processing methods, the integration of photoacoustic and ultrasound imaging has introduced a novel hybrid imaging modality suitable for clinical applications. Photoacoustic-ultrasound imaging allows for non-invasive, high-resolution, and deep-penetrating imaging, providing a wealth of image information. In recent years, with the deepening research and the expanding biomedical application scenarios of photoacoustic-ultrasound bimodal systems, the immense potential of photoacoustic-ultrasound bimodal imaging in basic research and clinical applications has been demonstrated, with some research achievements already commercialized. In this review, we introduce the principles, technical advantages, and biomedical applications of photoacoustic-ultrasound bimodal imaging techniques, specifically focusing on tomographic, microscopic, and endoscopic imaging modalities. Furthermore, we discuss the future directions of photoacoustic-ultrasound bimodal imaging technology.
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Affiliation(s)
- Yinshi Yu
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China
| | - Ting Feng
- Academy for Engineering & Technology, Fudan University, Shanghai 200433,China.
| | - Haixia Qiu
- First Medical Center of PLA General Hospital, Beijing, China
| | - Ying Gu
- First Medical Center of PLA General Hospital, Beijing, China
| | - Qian Chen
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China
| | - Chao Zuo
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China.
| | - Haigang Ma
- Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210094, China; Smart Computational Imaging Research Institute (SCIRI) of Nanjing University of Science and Technology, Nanjing, Jiangsu Province 210019, China; Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense, Nanjing, Jiangsu Province 210094, China.
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Stănuşi A, Iacov-Crăițoiu MM, Scrieciu M, Mitruț I, Firulescu BC, Boțilă MR, Vlăduțu DE, Stănuşi AŞ, Mercuț V, Osiac E. Morphological and Optical Coherence Tomography Aspects of Non-Carious Cervical Lesions. J Pers Med 2023; 13:jpm13050772. [PMID: 37240942 DOI: 10.3390/jpm13050772] [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: 03/29/2023] [Revised: 04/24/2023] [Accepted: 04/28/2023] [Indexed: 05/28/2023] Open
Abstract
Non-carious cervical lesions (NCCLs) are considered the irreversible losses of dental hard tissues at the cemento-enamel junction, in the absence of acute trauma and dental caries. The aim of this study was to highlight the presence of NCCLs in cervical areas based on specific macroscopic aspects in order to establish their clinical form, size and location and to confirm the role of optical coherence tomography (OCT) examination in the early diagnosis of these lesions. For this study, 52 extracted teeth were used, which did not have endodontic treatments, fillings or carious lesions in the cervical area. All teeth were examined macroscopically and OCT was used to evaluate the degree of occlusal wear, the presence and clinical form of NCCLs. Most NCCLs were identified on the buccal surfaces of the premolars. The most frequently encountered clinical form was the wedge-shaped form, with a radicular location. NCCLs present most frequently in the wedge-shaped form. Teeth that presented several NCCLs were identified. The OCT examination is an adjunct method to evaluate the clinical forms of NCCL.
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Affiliation(s)
- Andreea Stănuşi
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | | | - Monica Scrieciu
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Ioana Mitruț
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | | | | | | | | | - Veronica Mercuț
- Department of Prosthetic Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Eugen Osiac
- Department of Biophysics, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
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Luo S, Ran Y, Liu L, Huang H, Tang X, Fan Y. Classification of gastric cancerous tissues by a residual network based on optical coherence tomography images. Lasers Med Sci 2022; 37:2727-2735. [PMID: 35344109 DOI: 10.1007/s10103-022-03546-8] [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: 10/10/2021] [Accepted: 03/10/2022] [Indexed: 11/26/2022]
Abstract
Optical coherence tomography (OCT) is a noninvasive, radiation-free, and high-resolution imaging technology. The intraoperative classification of normal and cancerous tissue is critical for surgeons to guide surgical operations. Accurate classification of gastric cancerous OCT images is beneficial to improve the effect of surgical treatment based on the deep learning method. The OCT system was used to collect images of cancerous tissues removed from patients. An intelligent classification method of gastric cancerous tissues based on the residual network is proposed in this study and optimized with the ResNet18 model. Four residual blocks are used to reset the model structure of ResNet18 and reduce the number of network layers to identify cancerous tissues. The model performance of different residual networks is evaluated by accuracy, precision, recall, specificity, F1 value, ROC curve, and model parameters. The classification accuracies of the proposed method and ResNet18 both reach 99.90%. Also, the model parameters of the proposed method are 44% of ResNet18, which occupies fewer system resources and is more efficient. In this study, the proposed deep learning method was used to automatically recognize OCT images of gastric cancerous tissue. This artificial intelligence method could help promote the clinical application of gastric cancerous tissue classification in the future.
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Affiliation(s)
- Site Luo
- Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Yuchen Ran
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Lifei Liu
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
| | - Huihui Huang
- Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education & Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Xiaoying Tang
- School of Life Science, Beijing Institute of Technology, Beijing, 100081, China
- Institute of Engineering Medicine, Beijing Institute of Technology, Beijing, 100081, China
| | - Yingwei Fan
- Institute of Engineering Medicine, Beijing Institute of Technology, Beijing, 100081, China.
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Petrescu SMS, Țuculină MJ, Osiac E, Camen A, Sălan AI, Mărășescu FI, Nicola AG, Bechir ES, Dascălu IT. Use of optical coherence tomography in orthodontics. Exp Ther Med 2021; 22:1424. [PMID: 34707705 PMCID: PMC8543239 DOI: 10.3892/etm.2021.10859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 09/07/2021] [Indexed: 11/24/2022] Open
Abstract
Optical coherence tomography (OCT) is a modern imaging method with applicability in orthodontics. In recent years, there has been an increasing trend in the use of ceramic brackets. The aim of the present study was to investigate the effects of bonding metallic and ceramic brackets on tooth enamel, using optical coherence tomography. For this purpose, 20 permanent teeth we bonded and were subsequently debonded using a side cutter or anterior bracket removal pliers. Using the OCT technique, the enamel, the amount of adhesive remaining and the bracket fragments remaining on the tooth surface were analyzed following the debonding procedure. It was demonstrated that enamel cracks were present only in the samples bonded with ceramic brackets. At the same time, it was noted that the type of pliers did not affect the incidence and extent of damage to the enamel. The type of debonding technique (using the side cutter or the anterior removal pliers) used did not markedly affect the amount of adhesive remaining on the teeth. Thus, as demonstrated herein, by analyzing the enamel structure through the use of OCT, the quality of the processes and the materials used for manufacturing brackets can be increased.
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Affiliation(s)
| | - Mihaela Jana Țuculină
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Eugen Osiac
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Adrian Camen
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Alex Ioan Sălan
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | | | - Andreea Gabriela Nicola
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
| | - Edwin Sever Bechir
- Faculty of Dentistry, University of Medicine and Pharmacy of Târgu Mureș, 540142 Târgu Mureș, Romania
| | - Ionela Teodora Dascălu
- Faculty of Dentistry, University of Medicine and Pharmacy of Craiova, 200349 Craiova, Romania
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Osiac E, Mitran SI, Manea CN, Cojocaru A, Rosu GC, Osiac M, Pirici DN, Bălșeanu AT, Cătălin B. Optical coherence tomography microscopy in experimental traumatic brain injury. Microsc Res Tech 2020; 84:422-431. [PMID: 33009699 PMCID: PMC7891427 DOI: 10.1002/jemt.23599] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 08/19/2020] [Accepted: 08/30/2020] [Indexed: 12/28/2022]
Abstract
Worldwide elderly traumatic brain injury (TBI) patients tend to become an increasing burden to the society. Thus, a faster and less expensive way of evaluating TBI victims is needed. In the present study we investigated if optical coherence tomography (OCT) could be used as such a method. By using an animal model, we established if OCT can detect cortical changes in the acute phase of a penetrating TBI, in young (5–7 months) and old (20–22 months) rats. Due to the long‐term evolution of TBI's, we wanted to investigate to what extent OCT could detect changes within the cortex in the chronic phase. Adult (7–12 months) male rats were used. Surprisingly, OCT imaging of the normal hemisphere was able to discriminate age‐related differences in the mean gray values (MGV) of recorded pixels (p = .032). Furthermore, in the acute phase of TBI, OCT images recorded at 24 hr after the injury showed differences between the apparent damaged area of young and aged animals. Changes of MGV and skewness were only recorded 48 hr after injury. Monitoring the chronical evolution of the TBI with OCT revealed changes over time exceeding the normal range recorded for MGV, skewness and kurtosis, 14 and 21 days after TBI. Although in the present study we still used an extremely invasive approach, as technology improves, less invasive and non‐harmful ways of recording OCT may allow for an objective way to detect changes within the brain structure after brain injuries.
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Affiliation(s)
- Eugen Osiac
- Experimental Research Center for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Department of Biophysics, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Smaranda Ioana Mitran
- Experimental Research Center for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Department of Physiology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Cătălin Nicolae Manea
- Experimental Research Center for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Department of Informatics, Communication and Statistics, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Alexandru Cojocaru
- Department of Physiology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Gabriela-Camelia Rosu
- Department of Research Methodology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Mariana Osiac
- Department of Physics, Faculty of Science, University of Craiova, Craiova, Romania
| | - Daniel Nicolae Pirici
- Department of Research Methodology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Adrian Tudor Bălșeanu
- Experimental Research Center for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Department of Physiology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Bogdan Cătălin
- Experimental Research Center for Normal and Pathological Aging, University of Medicine and Pharmacy of Craiova, Craiova, Romania.,Department of Physiology, University of Medicine and Pharmacy of Craiova, Craiova, Romania
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Blood Coagulation Following an Acute Ischemic Stroke. CURRENT HEALTH SCIENCES JOURNAL 2018; 44:118-121. [PMID: 30687528 PMCID: PMC6320462 DOI: 10.12865/chsj.44.02.04] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 03/27/2018] [Indexed: 01/01/2023]
Abstract
Objective. Hemostasis is a complex physiological process that stops bleeding at the site of a vascular injury. Although the majority of vascular accidents are ischemic, the role of hypercoagulable state and stroke needs further investigation. Materials and Methods. Fresh whole blood was taken from 61 acute ischemic stroke patients and compared to 18 healthy subjects and investigated with optical coherence tomography imaging after initiating coagulation. We used an OCT1300SS system (Thorlabs) and did 3D scans. We then processed the images with ImageJ. For each image mean, integrated density, skewness and kurtosis of gray values were analyzed. Results. Mean gray value and integrated intensity of sampled data showed an intrinsic difference detected with OCT. This difference was further confirmed by the data distribution analysis. Conclusions. Results suggest, that normal blood coagulation, is not a random reaction while in the case of stroke patients, the relatively symmetrical distribution of gray values brings coagulation closer randomized process.
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Nguyen TU, Pierce MC, Higgins L, Tkaczyk TS. Snapshot 3D optical coherence tomography system using image mapping spectrometry. OPTICS EXPRESS 2013; 21:13758-72. [PMID: 23736629 PMCID: PMC3686468 DOI: 10.1364/oe.21.013758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A snapshot 3-Dimensional Optical Coherence Tomography system was developed using Image Mapping Spectrometry. This system can give depth information (Z) at different spatial positions (XY) within one camera integration time to potentially reduce motion artifact and enhance throughput. The current (x,y,λ) datacube of (85×356×117) provides a 3D visualization of sample with 400 μm depth and 13.4 μm in transverse resolution. Axial resolution of 16.0 μm can also be achieved in this proof-of-concept system. We present an analysis of the theoretical constraints which will guide development of future systems with increased imaging depth and improved axial and lateral resolutions.
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Affiliation(s)
- Thuc-Uyen Nguyen
- Department of Bioengineering, Rice University, 6500 Main St., Houston, Texas 77030,
USA
| | - Mark C Pierce
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey599 Taylor Road, Piscataway, NJ 08854,
USA
| | - Laura Higgins
- Department of Biomedical Engineering, Rutgers, The State University of New Jersey599 Taylor Road, Piscataway, NJ 08854,
USA
| | - Tomasz S Tkaczyk
- Department of Bioengineering, Rice University, 6500 Main St., Houston, Texas 77030,
USA
- Department of Electrical and Computer Engineering, Rice University, 6100 MainStreet, Houston, Texas 77005,
USA
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8
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Xu C, Zhang S, Tan Y, Zhao S. Inner structure detection by optical tomography technology based on feedback of microchip Nd:YAG lasers. OPTICS EXPRESS 2013; 21:11819-11826. [PMID: 23736403 DOI: 10.1364/oe.21.011819] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We describe a new optical tomography technology based on feedback of microchip Nd:YAG lasers. In the case of feedback light frequency-shifted, light can be magnified by a fact of 10(6) in the Nd:YAG microchip lasers, which makes it possible to realize optical tomography with a greater depth than current optical tomography. The results of the measuring and imaging of kinds of samples are presented, which demonstrate the feasibility and potential of this approach in the inner structure detection. The system has a lateral resolution of ~1 μm, a vertical resolution of 15 μm and a longitudinal scanning range of over 10mm.
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Affiliation(s)
- Chunxin Xu
- Institute of Opto-Electronic Engineering, Tsinghua University, Beijing 100084, China
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SCHEMANN MICHAEL, CAMILLERI MICHAEL. Functions and imaging of mast cell and neural axis of the gut. Gastroenterology 2013; 144:698-704.e4. [PMID: 23354018 PMCID: PMC3922647 DOI: 10.1053/j.gastro.2013.01.040] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 12/05/2012] [Accepted: 01/23/2013] [Indexed: 12/22/2022]
Abstract
Close association between nerves and mast cells in the gut wall provides the microanatomic basis for functional interactions between these elements, supporting the hypothesis that a mast cell-nerve axis influences gut functions in health and disease. Advanced morphology and imaging techniques are now available to assess structural and functional relationships of the mast cell-nerve axis in human gut tissues. Morphologic techniques including co-labeling of mast cells and nerves serve to evaluate changes in their densities and anatomic proximity. Calcium (Ca(++)) and potentiometric dye imaging provide novel insights into functions such as mast cell-nerve signaling in the human gut tissues. Such imaging promises to reveal new ionic or molecular targets to normalize nerve sensitization induced by mast cell hyperactivity or mast cell sensitization by neurogenic inflammatory pathways. These targets include proteinase-activated receptor (PAR) 1 or histamine receptors. In patients, optical imaging in the gut in vivo has the potential to identify neural structures and inflammation in vivo. The latter has some risks and potential of sampling error with a single biopsy. Techniques that image nerve fibers in the retina without the need for contrast agents (optical coherence tomography and full-field optical coherence microscopy) may be applied to study submucous neural plexus. Moreover, the combination of submucosal dissection, use of a fluorescent marker, and endoscopic confocal microscopy provides detailed imaging of myenteric neurons and smooth muscle cells in the muscularis propria. Studies of motility and functional gastrointestinal disorders would be feasible without the need for full-thickness biopsy.
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Affiliation(s)
- MICHAEL SCHEMANN
- Human Biology, Technische Universität
München, Freising, Germany
| | - MICHAEL CAMILLERI
- Clinical Enteric Neuroscience Translational and
Epidemiological Research (CENTER), Mayo Clinic, Rochester, Minnesota
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Hariri LP, Applegate MB, Mino-Kenudson M, Mark EJ, Bouma BE, Tearney GJ, Suter MJ. Optical frequency domain imaging of ex vivo pulmonary resection specimens: obtaining one to one image to histopathology correlation. J Vis Exp 2013:3855. [PMID: 23381470 DOI: 10.3791/3855] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Lung cancer is the leading cause of cancer-related deaths. Squamous cell and small cell cancers typically arise in association with the conducting airways, whereas adenocarcinomas are typically more peripheral in location. Lung malignancy detection early in the disease process may be difficult due to several limitations: radiological resolution, bronchoscopic limitations in evaluating tissue underlying the airway mucosa and identifying early pathologic changes, and small sample size and/or incomplete sampling in histology biopsies. High resolution imaging modalities, such as optical frequency domain imaging (OFDI), provide non-destructive, large area 3-dimensional views of tissue microstructure to depths approaching 2 mm in real time (Figure 1). OFDI has been utilized in a variety of applications, including evaluation of coronary artery atherosclerosis and esophageal intestinal metaplasia and dysplasia. Bronchoscopic OCT/OFDI has been demonstrated as a safe in vivo imaging tool for evaluating the pulmonary airways (Animation). OCT has been assessed in pulmonary airways and parenchyma of animal models and in vivo human airway. OCT imaging of normal airway has demonstrated visualization of airway layering and alveolar attachments, and evaluation of dysplastic lesions has been found useful in distinguishing grades of dysplasia in the bronchial mucosa. OFDI imaging of bronchial mucosa has been demonstrated in a short bronchial segment (0.8 cm). Additionally, volumetric OFDI spanning multiple airway generations in swine and human pulmonary airways in vivo has been described. Endobronchial OCT/OFDI is typically performed using thin, flexible catheters, which are compatible with standard bronchoscopic access ports. Additionally, OCT and OFDI needle-based probes have recently been developed, which may be used to image regions of the lung beyond the airway wall or pleural surface. While OCT/OFDI has been utilized and demonstrated as feasible for in vivo pulmonary imaging, no studies with precisely matched one-to-one OFDI:histology have been performed. Therefore, specific imaging criteria for various pulmonary pathologies have yet to be developed. Histopathological counterparts obtained in vivo consist of only small biopsy fragments, which are difficult to correlate with large OFDI datasets. Additionally, they do not provide the comprehensive histology needed for registration with large volume OFDI. As a result, specific imaging features of pulmonary pathology cannot be developed in the in vivo setting. Precisely matched, one-to-one OFDI and histology correlation is vital to accurately evaluate features seen in OFDI against histology as a gold standard in order to derive specific image interpretation criteria for pulmonary neoplasms and other pulmonary pathologies. Once specific imaging criteria have been developed and validated ex vivo with matched one-to-one histology, the criteria may then be applied to in vivo imaging studies. Here, we present a method for precise, one to one correlation between high resolution optical imaging and histology in ex vivo lung resection specimens. Throughout this manuscript, we describe the techniques used to match OFDI images to histology. However, this method is not specific to OFDI and can be used to obtain histology-registered images for any optical imaging technique. We performed airway centered OFDI with a specialized custom built bronchoscopic 2.4 French (0.8 mm diameter) catheter. Tissue samples were marked with tissue dye, visible in both OFDI and histology. Careful orientation procedures were used to precisely correlate imaging and histological sampling locations. The techniques outlined in this manuscript were used to conduct the first demonstration of volumetric OFDI with precise correlation to tissue-based diagnosis for evaluating pulmonary pathology. This straightforward, effective technique may be extended to other tissue types to provide precise imaging to histology correlation needed to determine fine imaging features of both normal and diseased tissues.
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Affiliation(s)
- Lida P Hariri
- Department of Pathology, Harvard Medical School, USA
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11
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Wieser W, Klein T, Adler DC, Trépanier F, Eigenwillig CM, Karpf S, Schmitt JM, Huber R. Extended coherence length megahertz FDML and its application for anterior segment imaging. BIOMEDICAL OPTICS EXPRESS 2012; 3:2647-57. [PMID: 23082303 PMCID: PMC3470011 DOI: 10.1364/boe.3.002647] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 09/14/2012] [Accepted: 09/15/2012] [Indexed: 05/17/2023]
Abstract
We present a 1300 nm Fourier domain mode locked (FDML) laser for optical coherence tomography (OCT) that combines both, a high 1.6 MHz wavelength sweep rate and an ultra-long instantaneous coherence length for rapid volumetric deep field imaging. By reducing the dispersion in the fiber delay line of the FDML laser, the instantaneous coherence length and hence the available imaging range is approximately quadrupled compared to previously published MHz-FDML setups, the imaging speed is increased by a factor of 16 compared to previous extended coherence length results. We present a detailed characterization of the FDML laser performance. We demonstrate for the first time MHz-OCT imaging of the anterior segment of the human eye. The OCT system provides enough imaging depth to cover the whole range from the top surface of the cornea down to the crystalline lens.
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Affiliation(s)
- Wolfgang Wieser
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Thomas Klein
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Desmond C. Adler
- LightLab Imaging, a St. Jude Medical subsidiary, Westford, MA, USA
| | | | - Christoph M. Eigenwillig
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | - Sebastian Karpf
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
| | | | - Robert Huber
- Lehrstuhl für BioMolekulare Optik, Fakultät für Physik, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 Munich, Germany
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12
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Tiernan JP, Ansari I, Hirst NA, Millner PA, Hughes TA, Jayne DG. Intra-operative tumour detection and staging in colorectal cancer surgery. Colorectal Dis 2012; 14:e510-20. [PMID: 22564278 DOI: 10.1111/j.1463-1318.2012.03078.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
AIM Surgical resection for colorectal cancer involves segmental resection and regional lymphadenectomy. The appropriateness of this 'one-size-fits-all' strategy is questioned as bowel cancer screening programmes result in a shift to earlier stage disease. Currently, the nodal status of a colorectal cancer can only be reliably determined by histopathological examination of the resected specimen. New methods of intra-operative staging are required to allow surgical resection to be tailored to the stage of the disease. METHOD A literature search was performed of PubMed and Embase databases using the terms 'colon' OR 'colorectal' AND 'intra-operative detection' OR 'intra-operative staging' OR 'intra-operative detection' OR 'radioimmunoguided surgery'. Articles published between January 1980 and January 2012 were included. Technologies that have the potential to allow intra-operative staging and treatment stratification were identified and further searches performed. RESULTS Established techniques such as sentinel lymph node mapping and radioimmunoguided surgery have benefited from combination with other technologies to allow real-time intra-operative staging. Intra-operative fluorescence, using naturally fluorescent biomarkers or fluorescent tumour probes, probably offers the most practical means of intra-operative lymph node staging and may be facilitated using nanotechnology. Optical coherence tomography and real-time elastography have the potential to provide an in vivo'virtual biopsy'. CONCLUSION Technological advances may allow accurate intra-operative lymph node staging to facilitate tailored surgical resection. This may become the next paradigm shift in colorectal cancer surgery.
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Affiliation(s)
- J P Tiernan
- Section of Translational Anaesthetic and Surgical Sciences, Leeds Institute of Molecular Medicine, St James's University Hospital, Leeds, UK.
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13
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Ovári A, Pau HW, Just T. [Optical coherence tomography in otolaryngology]. Orv Hetil 2011; 152:1125-32. [PMID: 21712174 DOI: 10.1556/oh.2011.29164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Optical coherence tomography is an imaging technique based on coherence interferometry. It is used in many medical fields due to its non-invasive imaging capabilities with micrometer resolution. The aim of the authors was to review the applicability of the optical coherence tomography in otolaryngology. Literature data and their own studies show that optical coherence tomography is a reliable method for identifying and targeted biopsy of inflammated, pre-malignant or cancer tissue in human laryngeal and pharyngeal mucosa. Another emerging field for optical coherence tomography is diagnosis of middle ear diseases, especially stapes ankylosis and cholesteatoma.
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Affiliation(s)
- Attila Ovári
- Universität Rostock Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie "Otto Körner" Rostock
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Săftoiu A, Vilmann P. Imaging techniques used for the real-time assessment of angiogenesis in digestive cancers. World J Gastroenterol 2011; 17:7-8. [PMID: 21218077 PMCID: PMC3016683 DOI: 10.3748/wjg.v17.i1.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 08/29/2010] [Accepted: 10/06/2010] [Indexed: 02/06/2023] Open
Abstract
Angiogenesis has a critical role in primary tumor growth and the development of metastases. Several angiogenesis inhibitors were recently developed, being a very attractive target for digestive tumor therapy. However, individualized therapy should not only be based on the pre-treatment imaging evaluation, but also on sensitive monitoring of microvascular changes during treatment. State-of-the-art imaging techniques have the potential to visualize and characterize angiogenesis, although the technology and methodologies employed are recent and need further validation. The aim of this series of reviews was to analyze and enhance current knowledge and future perspectives about the real-time assessment of angiogenesis in digestive cancers, used for the longitudinal monitoring of the effects of chemo-radiotherapy (including anti-angiogenic therapies), as well as for the precise targeting of drugs through molecular-based drug-delivery systems.
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