1
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González Olmos A, Zilpelwar S, Sunil S, Boas DA, Postnov DD. Optimizing the precision of laser speckle contrast imaging. Sci Rep 2023; 13:17970. [PMID: 37864006 PMCID: PMC10589309 DOI: 10.1038/s41598-023-45303-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 10/18/2023] [Indexed: 10/22/2023] Open
Abstract
Laser speckle contrast imaging (LSCI) is a rapidly developing technology broadly applied for the full-field characterization of tissue perfusion. Over the recent years, significant advancements have been made in interpreting LSCI measurements and improving the technique's accuracy. On the other hand, the method's precision has yet to be studied in detail, despite being as important as accuracy for many biomedical applications. Here we combine simulation, theory and animal experiments to systematically evaluate and re-analyze the role of key factors defining LSCI precision-speckle-to-pixel size ratio, polarisation, exposure time and camera-related noise. We show that contrary to the established assumptions, smaller speckle size and shorter exposure time can improve the precision, while the camera choice is less critical and does not affect the signal-to-noise ratio significantly.
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Affiliation(s)
| | - Sharvari Zilpelwar
- Department of Biomedical Engineering, Boston University, Boston, MA, 02215, USA
| | - Smrithi Sunil
- Department of Biomedical Engineering, Boston University, Boston, MA, 02215, USA
| | - David A Boas
- Department of Biomedical Engineering, Boston University, Boston, MA, 02215, USA
| | - Dmitry D Postnov
- Department of Clinical Medicine, Aarhus University, 8200, Aarhus, Denmark.
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2
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González Olmos A, Humlesen Z, Matchkov V, Postnov DD. Lossless temporal contrast analysis of laser speckle images from periodic signals. BIOMEDICAL OPTICS EXPRESS 2023; 14:1355-1363. [PMID: 37078029 PMCID: PMC10110321 DOI: 10.1364/boe.485951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 05/03/2023]
Abstract
Laser speckle contrast imaging is a technique that provides valuable physiological information about vascular topology and blood flow dynamics. When using contrast analysis, it is possible to obtain detailed spatial information at the cost of sacrificing temporal resolution and vice versa. Such a trade-off becomes problematic when assessing blood dynamics in narrow vessels. This study presents a new contrast calculation method that preserves fine temporal dynamics and structural features when applied to periodic blood flow changes, such as cardiac pulsatility. We use simulations and in vivo experiments to compare our method with the standard spatial and temporal contrast calculations and demonstrate that the proposed method retains the spatial and temporal resolutions, resulting in the improved estimation of the blood flow dynamics.
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Affiliation(s)
- Alberto González Olmos
- Center of Functionally Integrative Neuroscience, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Zaka Humlesen
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | - Dmitry D. Postnov
- Center of Functionally Integrative Neuroscience, Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
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3
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Feng X, Geng M, Meng X, Zou D, Jin Z, Liu G, Zhou C, Ren Q, Lu Y. SGLSA: Sphygmus gated laser speckle angiography for microcirculation hemodynamics imaging. Comput Med Imaging Graph 2023; 103:102164. [PMID: 36563513 DOI: 10.1016/j.compmedimag.2022.102164] [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: 06/23/2022] [Revised: 11/16/2022] [Accepted: 12/08/2022] [Indexed: 12/23/2022]
Abstract
Hemodynamics imaging of the retinal microcirculation has been demonstrated to be potential access to evaluating ophthalmic diseases, cardio-cerebrovascular diseases, and metabolic diseases. However, existing structural and functional imaging techniques are insufficient in spatial or temporal resolution. The sphygmus gated laser speckle angiography (SGLSA) is proposed for structural and functional imaging with high spatiotemporal resolution. Compared with classic LSCI algorithms, SGLSA presents a much clearer perfusion image and higher signal-to-noise ratio pulsatility. The SGLSA algorithm also shows better performance on patients than traditional LSCI methods. The high spatiotemporal resolution provided by the SGLSA algorithm greatly enhances the ability of retinal microcirculation analysis, which makes up for the deficiency of the LSCI technology, and attaches great significance to retinal hemodynamic imaging, biomarker research, and clinical diagnosis.
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Affiliation(s)
- Ximeng Feng
- Institute of Medical Technology, Peking University Health Science Center, Peking University, Beijing, China; Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China; National Biomedical Imaging Center, Peking University, Beijing, China; Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Mufeng Geng
- Institute of Medical Technology, Peking University Health Science Center, Peking University, Beijing, China; Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China; National Biomedical Imaging Center, Peking University, Beijing, China; Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Xiangxi Meng
- Key Laboratory of Carcinogenesis and Translational Research, Department of Nuclear Medicine, Peking University Cancer Hospital & Institute, Beijing, China
| | - Da Zou
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Zi Jin
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Gangjun Liu
- Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Chuanqing Zhou
- College of Medical Instrument, Shanghai University of Medicine and Health Sciences, Shanghai, China
| | - Qiushi Ren
- Institute of Medical Technology, Peking University Health Science Center, Peking University, Beijing, China; Department of Biomedical Engineering, College of Future Technology, Peking University, Beijing, China; National Biomedical Imaging Center, Peking University, Beijing, China; Institute of Biomedical Engineering, Shenzhen Bay Laboratory, Shenzhen, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China
| | - Yanye Lu
- Institute of Medical Technology, Peking University Health Science Center, Peking University, Beijing, China; National Biomedical Imaging Center, Peking University, Beijing, China; Institute of Biomedical Engineering, Peking University Shenzhen Graduate School, Shenzhen, China.
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4
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Liu C, Kılıç K, Erdener SE, Boas DA, Postnov DD. Choosing a model for laser speckle contrast imaging. BIOMEDICAL OPTICS EXPRESS 2021; 12:3571-3583. [PMID: 34221679 PMCID: PMC8221943 DOI: 10.1364/boe.426521] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 05/08/2021] [Accepted: 05/18/2021] [Indexed: 05/02/2023]
Abstract
Laser speckle contrast imaging (LSCI) is a real-time full-field non-invasive technique, which is broadly applied to visualize blood flow in biomedical applications. In its foundation is the link between the speckle contrast and dynamics of light scattering particles-erythrocytes. The mathematical form describing this relationship, which is critical for accurate blood flow estimation, depends on the sample's light-scattering properties. However, in biological applications, these properties are often unknown, thus requiring assumptions to be made to perform LSCI analysis. Here, we review the most critical assumptions in the LSCI theory and simulate how they affect blood flow estimation accuracy. We show that the most commonly applied model can severely underestimate the flow change, particularly when imaging brain parenchyma or other capillary perfused tissue (e.g. skin) under ischemic conditions. Based on these observations and guided by the recent experimental results, we propose an alternative model that allows measuring blood flow changes with higher accuracy.
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Affiliation(s)
- Chang Liu
- Department of Biomedical Engineering, Boston University, Massachusetts 02215, USA
- Department of Bioengineering, Northeastern University, Massachusetts 02115, USA
| | - Kıvılcım Kılıç
- Neurophotonics Center, Boston University, Massachusetts 02215, USA
| | - Sefik Evren Erdener
- Neurophotonics Center, Boston University, Massachusetts 02215, USA
- Institute of Neurological Sciences and Psychiatry, Hacettepe University, Ankara, Turkey
| | - David A. Boas
- Department of Biomedical Engineering, Boston University, Massachusetts 02215, USA
- Neurophotonics Center, Boston University, Massachusetts 02215, USA
| | - Dmitry D. Postnov
- Neurophotonics Center, Boston University, Massachusetts 02215, USA
- Department of Biomedical Sciences, Copenhagen University, Copenhagen, Denmark
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5
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Mac Grory B, Schrag M, Poli S, Boisvert CJ, Spitzer MS, Schultheiss M, Nedelmann M, Yaghi S, Guhwe M, Moore EE, Hewitt HR, Barter KM, Kim T, Chen M, Humayun L, Peng C, Chhatbar PY, Lavin P, Zhang X, Jiang X, Raz E, Saidha S, Yao J, Biousse V, Feng W. Structural and Functional Imaging of the Retina in Central Retinal Artery Occlusion - Current Approaches and Future Directions. J Stroke Cerebrovasc Dis 2021; 30:105828. [PMID: 34010777 DOI: 10.1016/j.jstrokecerebrovasdis.2021.105828] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/06/2021] [Accepted: 04/08/2021] [Indexed: 01/28/2023] Open
Abstract
Central retinal artery occlusion (CRAO) is a form of acute ischemic stroke which affects the retina. Intravenous thrombolysis is emerging as a compelling therapeutic approach. However, it is not known which patients may benefit from this therapy because there are no imaging modalities that adequately distinguish viable retina from irreversibly infarcted retina. The inner retina receives arterial supply from the central retinal artery and there is robust collateralization between this circulation and the outer retinal circulation, provided by the posterior ciliary circulation. Fundus photography can show canonical changes associated with CRAO including a cherry-red spot, arteriolar boxcarring and retinal pallor. Fluorescein angiography provides 2-dimensional imaging of the retinal circulation and can distinguish a complete from a partial CRAO as well as central versus peripheral retinal non-perfusion. Transorbital ultrasonography may assay flow through the central retinal artery and is useful in the exclusion of other orbital pathology that can mimic CRAO. Optical coherence tomography provides structural information on the different layers of the retina and exploratory work has described its utility in determining the time since onset of ischemia. Two experimental techniques are discussed. 1) Retinal functional imaging permits generation of capillary perfusion maps and can assay retinal oxygenation and blood flow velocity. 2) Photoacoustic imaging combines the principles of optical excitation and ultrasonic detection and - in animal studies - has been used to determine the retinal oxygen metabolic rate. Future techniques to determine retinal viability in clinical practice will require rapid, easily used, and reproducible methods that can be deployed in the emergency setting.
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Affiliation(s)
- Brian Mac Grory
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, USA.
| | - Matthew Schrag
- Department of Neurology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
| | - Sven Poli
- Department of Neurology & Stroke, and Hertie Institute for Clinical Brain Research, Eberhard-Karls University, Tübingen, Germany.
| | - Chantal J Boisvert
- Department of Ophthalmology, Duke University School of Medicine, Durham, North Carolina, USA.
| | - Martin S Spitzer
- Department of Ophthalmology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
| | | | - Max Nedelmann
- Department of Neurology, Sana Regio Klinikum, Pinneberg, Germany.
| | - Shadi Yaghi
- Department of Neurology, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
| | - Mary Guhwe
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, USA.
| | - Elizabeth E Moore
- Department of Neurology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
| | - Hunter R Hewitt
- Department of Neurology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
| | - Kelsey M Barter
- Department of Neurology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
| | - Taewon Kim
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, USA.
| | - Maomao Chen
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA.
| | - Lucas Humayun
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA.
| | - Chang Peng
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina, USA.
| | - Pratik Y Chhatbar
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, USA.
| | - Patrick Lavin
- Department of Neurology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA; Department of Ophthalmology & Visual Sciences, Vanderbilt Eye Institute, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
| | - Xuxiang Zhang
- Department of Ophthalmology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Xiaoning Jiang
- Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina, USA.
| | - Eytan Raz
- Department of Radiology, NYU Langone Health, New York City, New York. USA.
| | - Shiv Saidha
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
| | - Junjie Yao
- Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA.
| | - Valérie Biousse
- Departments of Ophthalmology and Neurology, Emory University School of Medicine, Atlanta, Georgia, USA.
| | - Wuwei Feng
- Department of Neurology, Duke University School of Medicine, Durham, North Carolina, USA.
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6
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Postnov DD, Tang J, Erdener SE, Kılıç K, Boas DA. Dynamic light scattering imaging. SCIENCE ADVANCES 2020; 6:6/45/eabc4628. [PMID: 33158865 PMCID: PMC7673709 DOI: 10.1126/sciadv.abc4628] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 09/17/2020] [Indexed: 05/18/2023]
Abstract
We introduce dynamic light scattering imaging (DLSI) to enable the wide-field measurement of the speckle temporal intensity autocorrelation function. DLSI uses the full temporal sampling of speckle fluctuations and a comprehensive model to identify the dynamic scattering regime and obtain a quantitative image of the scatterer dynamics. It reveals errors in the traditional theory of laser Doppler flowmetry and laser speckle contrast imaging and provides guidance on the best model to use in cerebral blood flow imaging.
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Affiliation(s)
- Dmitry D Postnov
- Neurophotonics Center, Boston University, Boston, MA 02215, USA
- Biomedical Sciences Institute, Faculty of Health and Medical Sciences, Copenhagen University, Copenhagen 2200, Denmark
| | - Jianbo Tang
- Neurophotonics Center, Boston University, Boston, MA 02215, USA
| | | | - Kıvılcım Kılıç
- Neurophotonics Center, Boston University, Boston, MA 02215, USA
| | - David A Boas
- Neurophotonics Center, Boston University, Boston, MA 02215, USA.
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7
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Postnov DD, Cheng X, Erdener SE, Boas DA. Choosing a laser for laser speckle contrast imaging. Sci Rep 2019; 9:2542. [PMID: 30796288 PMCID: PMC6385248 DOI: 10.1038/s41598-019-39137-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 01/16/2019] [Indexed: 11/10/2022] Open
Abstract
The use of laser speckle contrast imaging (LSCI) has expanded rapidly for characterizing the motion of scattering particles. Speckle contrast is related to the dynamics of the scattering particles via a temporal autocorrelation function, but the quality of various elements of the imaging system can adversely affect the quality of the signal recorded by LSCI. While it is known that the laser coherence affects the speckle contrast, it is generally neglected in in vivo LSCI studies and was not thoroughly addressed in a practical matter. In this work, we address the question of how the spectral width of the light source affects the speckle contrast both experimentally and through numerical simulations. We show that commonly used semiconductor laser diodes have a larger than desired spectral width that results in a significantly reduced speckle contrast compared with ideal narrow band lasers. This results in a reduced signal-to-noise ratio for estimating changes in the motion of scattering particles. We suggest using a volume holographic grating stabilized laser diode or other diodes that have a spectrum of emitted light narrower than ≈1 nm to improve the speckle contrast.
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Affiliation(s)
- Dmitry D Postnov
- Boston University, Department of Biomedical Engineering, Boston, MA, 02215, USA. .,Copenhagen University, Department of Biomedical Sciences, Copenhagen, 2200, Denmark.
| | - Xiaojun Cheng
- Boston University, Department of Biomedical Engineering, Boston, MA, 02215, USA
| | - Sefik Evren Erdener
- Boston University, Department of Biomedical Engineering, Boston, MA, 02215, USA
| | - David A Boas
- Boston University, Department of Biomedical Engineering, Boston, MA, 02215, USA
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8
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Lv W, Wang Y, Chen X, Fu X, Lu J, Li P. Enhancing vascular visualization in laser speckle contrast imaging of blood flow using multi-focus image fusion. JOURNAL OF BIOPHOTONICS 2019; 12:e201800100. [PMID: 29952071 DOI: 10.1002/jbio.201800100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2018] [Revised: 05/25/2018] [Accepted: 06/26/2018] [Indexed: 05/24/2023]
Abstract
Laser speckle contrast imaging (LSCI) is a full-field optical imaging method for monitoring blood flow and vascular morphology with high spatiotemporal resolution. However, due to the limited depth of field of optical system, it is difficult to capture a clear blood flow image with all blood vessels focused, especially for the non-planar biological tissues. In this study, a multi-focus image fusion method based on contourlet transform is introduced to reduce the misfocus effects in LSCI. The experimental results suggest that this method can provide an all-in-focus blood flow image, which is convenient to observe the blood vessels.
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Affiliation(s)
- Wenzhi Lv
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Yang Wang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Xiao Chen
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Xiaoxi Fu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Jinling Lu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
| | - Pengcheng Li
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology, Wuhan, China
- MoE Key Laboratory for Biomedical Photonics, Collaborative Innovation Center for Biomedical Engineering, School of Engineering Sciences, Huazhong University of Science and Technology, Wuhan, China
- HUST-Suzhou Institute for Brainsmatics, Suzhou, China
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9
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Shi R, Feng W, Zhang C, Zhang Z, Zhu D. FSOCA-induced switchable footpad skin optical clearing window for blood flow and cell imaging in vivo. JOURNAL OF BIOPHOTONICS 2017; 10:1647-1656. [PMID: 28516571 DOI: 10.1002/jbio.201700052] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Revised: 04/07/2017] [Accepted: 04/09/2017] [Indexed: 05/28/2023]
Abstract
The mouse footpad for its feature of hairlessness provides an available window for imaging vascular and cellular structure and function in vivo. Unfortunately, the strong scattering of its skin limits the penetration of light and reduces the imaging contrast and depth. Herein, an innovative footpad skin optical clearing agent (FSOCA) was developed to make the footpad skin transparent quickly by topical application. The results demonstrate that FSOCA treatment not only allowed the cutaneous blood vessels and blood flow distribution to be monitored by laser speckle contrast imaging technique with higher contrast, but also permitted the fluorescent cells to be imaged by laser scanning confocal microscopy with higher fluorescence signal intensity and larger imaging depth. In addition, the physiological saline-treatment could make the footpad skin recover to the initial turbid status, and reclearing would not induce any adverse effects on the distributions and morphologies of blood vessels and cells, which demonstrated a safe and switchable window for biomedical imaging. This switchable footpad skin optical clearing window will be significant for studying blood flow dynamics and cellular immune function in vivo in some vascular and immunological diseases. Picture: Repeated cell imaging in vivo before (a) and after (b) FSOCA treatment. (c) Merged images of 4 h (cyan border) or 72 h (magenta border) over 0 h. (d) Zoom of ROI in 4 h (yellow rectangle) or 72 h (red rectangle).
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Affiliation(s)
- Rui Shi
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Key Laboratory of Biomedical Photonics, HUST, Ministry of Education, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Hubei Bioinformatics and Bioimaging Key Laboratory, Department of Biomedical Engineering, HUST, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
| | - Wei Feng
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Key Laboratory of Biomedical Photonics, HUST, Ministry of Education, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Hubei Bioinformatics and Bioimaging Key Laboratory, Department of Biomedical Engineering, HUST, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
| | - Chao Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Key Laboratory of Biomedical Photonics, HUST, Ministry of Education, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Hubei Bioinformatics and Bioimaging Key Laboratory, Department of Biomedical Engineering, HUST, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
| | - Zhihong Zhang
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Key Laboratory of Biomedical Photonics, HUST, Ministry of Education, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Hubei Bioinformatics and Bioimaging Key Laboratory, Department of Biomedical Engineering, HUST, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
| | - Dan Zhu
- Britton Chance Center for Biomedical Photonics, Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Key Laboratory of Biomedical Photonics, HUST, Ministry of Education, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
- Hubei Bioinformatics and Bioimaging Key Laboratory, Department of Biomedical Engineering, HUST, 1037 Luoyu Road, Wuhan, 430074, Hubei, P. R. China
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10
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Rat retinal vasomotion assessed by laser speckle imaging. PLoS One 2017; 12:e0173805. [PMID: 28339503 PMCID: PMC5365106 DOI: 10.1371/journal.pone.0173805] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2016] [Accepted: 02/27/2017] [Indexed: 11/19/2022] Open
Abstract
Vasomotion is spontaneous or induced rhythmic changes in vascular tone or vessel diameter that lead to rhythmic changes in flow. While the vascular research community debates the physiological and pathophysiological consequence of vasomotion, there is a great need for experimental techniques that can address the role and dynamical properties of vasomotion in vivo. We apply laser speckle imaging to study spontaneous and drug induced vasomotion in retinal network of anesthetized rats. The results reveal a wide variety of dynamical patterns. Wavelet-based analysis shows that (i) spontaneous vasomotion occurs in anesthetized animals and (ii) vasomotion can be initiated by systemic administration of the thromboxane analogue U-46619 and the nitric-oxide donor S-nitroso-acetylDL-penicillamine (SNAP). Although these drugs activate different cellular pathways responsible for vasomotion, our approach can track the dynamical changes they cause.
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11
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Postnov DD, Tuchin VV, Sosnovtseva O. Estimation of vessel diameter and blood flow dynamics from laser speckle images. BIOMEDICAL OPTICS EXPRESS 2016; 7:2759-68. [PMID: 27446704 PMCID: PMC4948628 DOI: 10.1364/boe.7.002759] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/10/2016] [Accepted: 06/16/2016] [Indexed: 05/02/2023]
Abstract
Laser speckle imaging is a rapidly developing method to study changes of blood velocity in the vascular networks. However, to assess blood flow and vascular responses it is crucial to measure vessel diameter in addition to blood velocity dynamics. We suggest an algorithm that allows for dynamical masking of a vessel position and measurements of it's diameter from laser speckle images. This approach demonstrates high reliability and stability.
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Affiliation(s)
- Dmitry D. Postnov
- Department of Biomedical Sciences, Copenhagen University, Blegdamsvej 3, 2200 Copenhagen N,
Denmark
| | - Valery V. Tuchin
- Research-Educational Institute of Optics and Biophotonics, Saratov National Research State University, Astrakhanskaya Str. 83, 410012 Saratov,
Russia
- Institute of Precision Mechanics and Control RAS, Rabochaya str. 24, 410028 Saratov,
Russia
- Interdisciplinary Laboratory of Biophotonics, Tomsk National Research State University, 634050 Tomsk,
Russia
| | - Olga Sosnovtseva
- Department of Biomedical Sciences, Copenhagen University, Blegdamsvej 3, 2200 Copenhagen N,
Denmark
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