Articles that mention Woo June Choi -Optical Coherence Tomography News

Woo June Choi

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1. Mentioned In 47 Articles
2. Mean-Subtraction Method for De-shadowing of Tail Artifacts in Cerebral OCTA Images: A Proof of Concept
  
  Explore MDPI Open Access Journals Platform Apr 26 2020 Neurology
  
  When imaging brain vasculature with optical coherence tomography angiography (OCTA), volumetric analysis of cortical vascular networks in OCTA datasets is frequently challenging due to the presence of artifacts, which appear as multiple-scattering tails beneath superficial large vessels in OCTA images. These tails shadow underlying small vessels, making the assessment of vascular morphology in the deep cortex difficult. In this work, we introduce an image processing technique based on mean subtraction ...
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  Mentions: University of Washington Ruikang K. Wang University of Ulsan
3. Optical coherence tomography angiography in preclinical neuroimaging
  
  Explore Home - Springer Jul 7 2019 Neurology
  
  Preclinical neuroimaging allows for the assessment of brain anatomy, connectivity, and function in laboratory animals, such as mice and this imaging field has been a rapidly growing aimed at bridging the translation gap between animal and human research. The progress in the animal research could be accelerated by high-resolution in vivo optical imaging technologies. Optical coherence tomography-based angiography (OCTA) estimates the scattering from moving red blood cells, providing the visualization ...
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  Mentions: Woo June Choi
4. Monitoring acute stroke progression: multi-parametric OCT imaging of cortical perfusion, flow, and tissue scattering in a mouse model of permanent focal ischemia
  
  Explore IEEE Xplore Feb 8 2019 Neurology
  
  Cerebral ischemic stroke causes injury to brain tissue characterized by a complex cascade of neuronal and vascular events. Imaging during early stages of its development allows prediction of tissue infarction and penumbra, so that optimal intervention can be determined in order to salvage brain function impairment. Therefore, there is a critical need for novel imaging techniques that can characterize brain injury in the earliest phases of ischemic stroke. This study ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
5. Aging-associated changes in cerebral vasculature and blood flow as determined by quantitative optical coherence tomography angiography
  
  Explore ScienceDirect Jun 26 2018 Neurology , Ophthalmology
  
  Capillary velocity increases by 21% and velocity heterogeneity increases by 19% with older age. Abstract Normal aging is associated with significant alterations in brains vascular structure and function, which can lead to compromised cerebral circulation and increased risk of neurodegeneration. The in vivo examination of cerebral blood flow (CBF), including capillary beds, in aging brains with sufficient spatial detail remains challenging with current imaging modalities. In the present study, we ...
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  Mentions: University of Washington Ruikang K. Wang UCSF
6. Multifunctional in vivo imaging for monitoring wound healing using swept-source polarization-sensitive optical coherence tomography
  
  Explore Wiley Online Library Nov 30 2017
  
  Background and Objective Wound healing involves a complex and dynamic biological process in response to tissue injury. Monitoring of the cascade of cellular events is useful for wound management and treatment. The aim of this study is to demonstrate the potential of multifunctional polarization-sensitive optical coherence tomography (PS-OCT) to longitudinally monitor the self-healing process in a murine cutaneous wound model. Materials and Methods A multi-functional PS-OCT system based on swept ...
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  Mentions: University of Washington Ruikang K. Wang Kwan Seob Park
7. Optical coherence tomography imaging of cranial meninges post brain injury in vivo
  
  Explore OSA | OSA Publishing Aug 16 2017
  
  We report a new application of optical coherence tomography (OCT) to investigate the cranial meninges in an animal model of brain injury in vivo. The injury is induced in a mouse due to skull thinning, in which the repeated and excessive drilling exerts mechanical stress on the mouse brain through the skull, resulting in acute and mild brain injury. Transcranial OCT imaging reveals an interesting virtual space between the cranial ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
8. Cerebral capillary velocimetry based on temporal OCT speckle contrast
  
  Explore OSA | OSA Publishing Nov 9 2016 Neurology
  
  We propose a new optical coherence tomography (OCT) based method to measure red blood cell (RBC) velocities of single capillaries in the cortex of rodent brain. This OCT capillary velocimetry exploits quantitative laser speckle contrast analysis to estimate speckle decorrelation rate from the measured temporal OCT speckle signals, which is related to microcirculatory flow velocity. We hypothesize that OCT signal due to sub-surface capillary flow can be treated as the ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
9. Optical coherence tomography based microangiography provides an ability to longitudinally image arteriogenesis in vivo
  
  Explore Taylor & Francis Online Oct 16 2016 Ophthalmology
  
  Purpose : To perform an analysis of optical coherence tomography (OCT) abnormalities in patients with MEWDS, during the acute and recovery stages, using enhanced depth imaging-OCT (EDI-OCT). Methods : A retrospective case series of five patients with MEWDS was included. EDI-OCT imaging was evaluated to detect retinal and choroidal features. Results : In the acute phase, focal impairment of the ellipsoid zone and external limiting membrane, hyperreflective dots in the inner choroid, and ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
10. Tail artifact removal in OCT angiography images of rodent cortex
  
  Explore Wiley Online Library Sep 7 2016 Cardiology , Neurology
  
  Optical coherence tomography angiography (OCTA) is a surging non-invasive, label-free, in vivo volumetric imaging method, currently being translated to clinical ophthalmology and becoming popular in neuroscience. Despite its attractiveness, there is an inherent issue of using OCT angiograms for quantitative cerebrovascular studies: The dynamic scattering of moving erythrocytes within pial vasculature creates tail-like artifacts that shadow the capillary vessels in the deeper layers of cortex. This false flow effect is ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
11. Quantitative Assessment of Anterior Segment Inflammation in a Rat Model of Uveitis Using Spectral-Domain Optical Coherence Tomography
  
  Explore IOVS Journal Jul 9 2016 Cardiology
  
  Purpose : To develop anterior segment spectral-domain optical coherence tomography (SD-OCT) and quantitative image analysis for use in experimental uveitis in rats. Methods : Acute anterior uveitis was generated in Lewis rats. A spectral domain anterior segment OCT system was used to image the anterior chamber (AC) and ciliary body at baseline and during peak inflammation 2 days later. Customized MatLab image analysis algorithms were developed to segment the AC, count AC ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
12. Automated segmentation and enhancement of optical coherence tomography-acquired images of rodent brain
  
  Explore ScienceDirect Jun 21 2016 Neurology
  
  Background Optical coherence tomography (OCT) is a non-invasive optical imaging method that has proven useful in various fields such as ophthalmology, dermatology and neuroscience. In ophthalmology, significant progress has been made in retinal layer segmentation and enhancement of OCT images. There are also segmentation algorithms to separate epidermal and dermal layers in OCT-acquired images of human skin. New Method We describe simple image processing methods that allow automatic segmentation and ...
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  Mentions: Oregon Health & Science University University of Washington Ruikang K. Wang
13. Wide-field optical coherence tomography angiography enabled by two repeated measurements of B-scans
  
  Explore OSA | OSA Publishing May 10 2016 Ophthalmology
  
  ...ide-field angiography up to 12 12 mm with clinically acceptable image quality. Ruikang K. Wang, Anqi Zhang, Woo June Choi, Qinqin Zhang, Chieh-li Chen, Andrew Miller, Giovanni Gregori, and Philip J. Rosenfeld, "Wide-fi...
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  Mentions: Giovanni Gregori Philip J. Rosenfeld University of Washington
14. Automated detection of inflammatory cells in whole anterior chamber of a uveitis mouse from swept-source optical coherence tomography images
  
  Explore Conference Proceedings Mar 15 2016 Ophthalmology
  
  Cell grading in a rodent anterior chamber is essential for anterior inflammation evaluation in preclinical vision research. This paper describes a computerized method for detection and counting of the anterior chamber cells from swept-source optical coherence tomography (SS-OCT) images of a experimental rodent model of uveitis. The volumetric anterior segment OCT data is obtained from 100 kHz SS-OCT imaging of mouse eye in vivo. For the OCT cross-sections, each OCT ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
15. Noninvasive imaging method looks deeper inside the body to study living brain
  
  Explore PhysOrg.com Oct 13 2015
  
  ...tivity to greater depths in tissue, extending the imaging range to more than 2 millimeters. More information: Woo June Choi et al. Swept-source optical coherence tomography powered by a 1.3 - μ m vertical cavity surface ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
16. Swept-source optical coherence tomography powered by a 1.3-μm vertical cavity surface emitting laser enables 2.3-mm-deep brain imaging in mice in vivo
  
  Explore SPIE | Journal Oct 9 2015
  
  We report noninvasive, in vivo optical imaging deep within a mouse brain by swept-source optical coherence tomography (SS-OCT), enabled by a 1.3 - m vertical cavity surface emitting laser (VCSEL). VCSEL SS-OCT offers a constant signal sensitivity of 105 dB throughout an entire depth of 4.25 mm in air, ensuring an extended usable imaging depth range of more than 2 mm in turbid biological tissue. Using this approach, we ...
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  Mentions: University of Washington Ruikang K. Wang Woo June Choi
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