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      OCT-angiography: A qualitative and quantitative comparison of 4 OCT-A devices.

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          Abstract

          To compare the quality of four OCT-angiography(OCT-A) modules.

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          Split-spectrum amplitude-decorrelation angiography with optical coherence tomography

          Yali Jia, Ou Tan, Jason Tokayer … (2012)
          Amplitude decorrelation measurement is sensitive to transverse flow and immune to phase noise in comparison to Doppler and other phase-based approaches. However, the high axial resolution of OCT makes it very sensitive to the pulsatile bulk motion noise in the axial direction. To overcome this limitation, we developed split-spectrum amplitude-decorrelation angiography (SSADA) to improve the signal-to-noise ratio (SNR) of flow detection. The full OCT spectrum was split into several narrower bands. Inter-B-scan decorrelation was computed using the spectral bands separately and then averaged. The SSADA algorithm was tested on in vivo images of the human macula and optic nerve head. It significantly improved both SNR for flow detection and connectivity of microvascular network when compared to other amplitude-decorrelation algorithms.
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            A Computational Tool for Quantitative Analysis of Vascular Networks

            Enrique Zudaire, Laure Gambardella, Christopher Kurcz … (2011)
            Angiogenesis is the generation of mature vascular networks from pre-existing vessels. Angiogenesis is crucial during the organism' development, for wound healing and for the female reproductive cycle. Several murine experimental systems are well suited for studying developmental and pathological angiogenesis. They include the embryonic hindbrain, the post-natal retina and allantois explants. In these systems vascular networks are visualised by appropriate staining procedures followed by microscopical analysis. Nevertheless, quantitative assessment of angiogenesis is hampered by the lack of readily available, standardized metrics and software analysis tools. Non-automated protocols are being used widely and they are, in general, time - and labour intensive, prone to human error and do not permit computation of complex spatial metrics. We have developed a light-weight, user friendly software, AngioTool, which allows for quick, hands-off and reproducible quantification of vascular networks in microscopic images. AngioTool computes several morphological and spatial parameters including the area covered by a vascular network, the number of vessels, vessel length, vascular density and lacunarity. In addition, AngioTool calculates the so-called “branching index” (branch points / unit area), providing a measurement of the sprouting activity of a specimen of interest. We have validated AngioTool using images of embryonic murine hindbrains, post-natal retinas and allantois explants. AngioTool is open source and can be downloaded free of charge.
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              Optical Coherence Tomography Angiography

              Simon Gao, Yali Jia, Miao Zhang … (2016)
              Optical coherence tomography angiography (OCTA) is a noninvasive approach that can visualize blood vessels down to the capillary level. With the advent of high-speed OCT and efficient algorithms, practical OCTA of ocular circulation is now available to ophthalmologists. Clinical investigations that used OCTA have increased exponentially in the past few years. This review will cover the history of OCTA and survey its most important clinical applications. The salient problems in the interpretation and analysis of OCTA are described, and recent advances are highlighted.
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                Author and article information

                Journal
                Journal ID (iso-abbrev): PLoS ONE
                Title: PloS one
                Publisher: Public Library of Science (PLoS)
                ISSN (Electronic): 1932-6203
                ISSN (Print): 1932-6203
                Publication date (Electronic): 2017
                Volume: 12
                Issue: 5
                Affiliations
                [1 ] Department of Ophthalmology, Inselspital, Bern University Hospital, University of Bern, Switzerland.
                [2 ] Bern Photographic Reading Center, University of Bern, Switzerland.
                [3 ] Department of Clinical Research, Inselspital Bern University Hospital, University of Bern, Switzerland.
                [4 ] Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria.
                Article
                Publisher Item ID: PONE-D-17-10099
                DOI: 10.1371/journal.pone.0177059
                PMC ID: 5425250
                PubMed ID: 28489918
                SO-VID: a1d3ae18-ac79-4da0-8353-4448cbfd5744
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