All Articles from Stacey S. Choi -Optical Coherence Tomography News

Articles from Stacey S. Choi

1-18 of 18
1. Postdoctoral Fellowship in High Resolution Retinal Imaging at The Ohio State University
  
  Explore Optical Coherence Tomography News Feb 15 2022 Ophthalmology , Jobs & Studentships
  
  A position for a postdoctoral fellow is available in the laboratory of Dr. Stacey Choi in the College of Optometry/Department of Ophthalmology and Visual Science at The Ohio State University (OSU). The successful candidate will work within a highly collaborative research environment focused on the use of Adaptive Optics – Optical Coherence Tomography (AO-OCT) system for the study of cellular level changes in the human retina including conditions such as age-related macular degeneration, glaucoma and diabetes. Retinal findings will be correlated with clinical structural and functional tests. The candidate will be expected to maintain the AO-OCT system; collect and analyze ...
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  Mentions: The Ohio State University
2. Cone Photoreceptor Integrity assessed with Adaptive Optics Imaging after Laser-Pointer-Induced Retinal Injury
  
  Explore LWW Online Sep 17 2020 Ophthalmology
  
  Purpose: To examine the three-dimensional foveal cone photoreceptor structure in a patient who had suffered laser pointer induced retinal injury . Methods: Patient underwent standard fundus photography and clinical spectral domain optical coherence tomography (SD-OCT) imaging. High-resolution imaging was performed using an Adaptive Optics -OCT-Scanning Laser Ophthalmoscope (AO-OCT-SLO). Results: AO imaging revealed loss of inner and outer segments of cone photoreceptors while the anterior retinal layers appeared healthy. Analysis of cone topology showed an increase in Voronoi domain area and a less regular hexagonal packing structure closer to the lesion site. Conclusion: Exposure to laser pointer radiation, however brief, can result ...
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  Mentions: The Ohio State University
3. Inner Retinal Changes in Primary Open-Angle Glaucoma Revealed Through Adaptive Optics-Optical Coherence Tomography
  
  Explore LWW Online Nov 1 2018 Ophthalmology
  
  Purpose: To examine the microstructural changes in the inner nuclear layer (INL) and ganglion cell layer (GCL) in a primary open-angle glaucoma (POAG) subject at 2 timepoints, 4 months apart. Patients and Methods: This case-control study (1 POAG subject and 1 normal control) used the single cell, 3-dimensional volumetric imaging capability of an adaptive optics - optical coherence tomography -scanning laser ophthalmoscopy system to examine the inner retina. Results: At the area of greatest glaucomatous change in the POAG subject [3-degrees temporal (T), 3-degrees inferior (I), right eye], the GCL was greatly thinned at both timepoints, yet retinal ganglion cell soma ...
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  Mentions: The Ohio State University
4. Volumetric imaging of rod and cone photoreceptor structure with a combined adaptive optics-optical coherence tomography-scanning laser ophthalmoscope
  
  Explore SPIE Digital Library Mar 10 2018 Ophthalmology
  
  We have designed and implemented a dual-mode adaptive optics (AO) imaging system that combines spectral domain optical coherence tomography (OCT) and scanning laser ophthalmoscopy (SLO) for in vivo imaging of the human retina. The system simultaneously acquires SLO frames and OCT B-scans at 60 Hz with an OCT volume acquisition time of 4.2 s. Transverse eye motion measured from the SLO is used to register the OCT B-scans to generate three-dimensional (3-D) volumes. Key optical design considerations include: minimizing system aberrations through the use of off-axis relay telescopes, conjugate pupil plane requirements, and the use of dichroic beam splitters ...
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  Mentions: UC Davis The Ohio State University
5. Performance of a combined optical coherence tomography and scanning laser ophthalmoscope with adaptive optics for human retinal imaging application
  
  Explore Conference Proceedings Mar 18 2015 Ophthalmology
  
  We describe the design and performance of a recently implemented retinal imaging system for the human eye that combines adaptive optics (AO) with spectral domain optical coherence tomography (OCT) and scanning laser ophthalmoscopy (SLO). The AO-OCT-SLO system simultaneously acquires SLO frames and OCT B-scans at 60 Hz with an OCT volume acquisition scan rate of 0.24 Hz. The SLO images are used to correct for eye motion during the registration of OCT B-scans. Key optical design considerations are discussed including: minimizing system aberrations through the use of off-axis relay telescopes; choice of telescope magnification based on pupil plane requirements ...
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  Mentions: UC Davis The Ohio State University InfraReDx
6. Evidence of outer retinal changes in glaucoma patients as revealed by ultrahigh-resolution in vivo retinal imaging
  
  Explore BJO Online Oct 18 2010 Ophthalmology
  
  Aims It is well established that glaucoma results in a thinning of the inner retina. To investigate whether the outer retina is also involved, ultrahigh-resolution retinal imaging techniques were utilised. Methods Eyes from 10 glaucoma patients (25–78 years old), were imaged using three research-grade instruments: (1) ultrahigh-resolution Fourier-domain optical coherence tomography (UHR-FD-OCT), (2) adaptive optics (AO) UHR-FD-OCT and (3) AO-flood illuminated fundus camera (AO-FC). UHR-FD-OCT and AO-UHR-FD-OCT B-scans were examined for any abnormalities in the retinal layers. On some patients, cone density measurements were made from the AO-FC en face images. Correlations between retinal structure and visual sensitivity were ...
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  Mentions: UC Davis
7. High-Resolution Fourier-Domain Optical Coherence Tomography of Choroidal Neovascular Membranes Associated with Age-Related Macular Degeneration
  
  Explore iovs.org Jul 22 2010 Ophthalmology
  
  High-resolution Fourier-domain optical coherence tomography (Fd-OCT) provided visualization of choroidal neovascular membrane (CNVM) and associated morphologic changes in the retina in eyes with neovascular age-related macular degeneration. The growth pattern and size of CNVM was determined with Fd-OCT and correlated better with findings on fluorescein angiography in eyes with classic lesions.
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  Mentions: UC Davis
8. Maculopathy Diagnosed With High-Resolution Fourier-Domain Optical Coherence Tomography in Eyes With Previously Unexplained Visual Loss
  
  Explore LWW Online Jun 23 2010 Ophthalmology
  
  Purpose: To describe maculopathy diagnosed with high-resolution Fourier-domain optical coherence tomography among eyes with previously unexplained visual loss. Methods: Nine eyes from six patients with previously unexplained vision loss based on funduscopy, fluorescein angiography, and Stratus optical coherence tomography and 32 eyes from 25 asymptomatic age-matched control subjects were imaged with a Fourier-domain optical coherence tomography instrument with axial resolution of 4 [mu]m to 4.5 [mu]m and transverse resolution of 10 [mu]m to 15 [mu]m. Results: Among eyes with unexplained vision loss, visual acuity ranged from 20/20 to 20/80 and central scotoma was ...
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  Mentions: Carl Zeiss Meditec UC Davis
9. Cellular resolution volumetric in vivo retinal imaging with adaptive optics–optical coherence tomography
  
  Explore opticsinfobase.org Mar 2 2009 Ophthalmology
  
  Ultrahigh-resolution adaptive optics–optical coherence tomography (UHR-AO-OCT) instrumentation allowing monochromatic and chromatic aberration correction was used for volumetric in vivo retinal imaging of various retinal structures including the macula and optic nerve head (ONH). Novel ... [Opt. Express 17, 4084-4094 (2009)]
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  Mentions: Lawrence Livermore National Laboratory UC Davis
10. Combined adaptive optics: optical coherence tomography and adaptive optics: scanning laser ophthalmoscopy system for retinal imaging
  
  Explore SPIE Digital Library Feb 18 2009 Ophthalmology
  
  We describe a novel instrument that combines adaptive optics - Fourier-domain optical coherence tomography (AO-OCT) with an adaptive optics scanning laser ophthalmoscope (AO-SLO). Both systems share a common AO sub-system and vertical scanner to permit simultaneous acquisition of retinal images from ... [Proc. SPIE 7163, 71630F (2009)] published Wed Feb 18, 2009.
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  Mentions: Lawrence Livermore National Laboratory UC Davis
11. Microcystoid Maculopathy Associated With Tamoxifen Use Diagnosed By High-Resolution Fourier-Domain Optical Coherence Tomography.
  
  Explore RETINAL Cases & Brief Reports Jan 9 2009 Ophthalmology
  
  Purpose: To describe a case of microcystoid maculopathy diagnosed by high-resolution Fourier-domain optical coherence tomography (Fd-OCT) in a patient treated with tamoxifen who had previously unexplained vision loss. Methods: Report of a case of a 66-year-old woman treated with tamoxifen for 4 years who had progressive unexplained vision loss in the left eye for 2 years. Results: Visual acuity was 20/25 in the right eye and 20/70 in the left eye. Findings of funduscopy and fluorescein angiography were unremarkable except for minimal pigment alteration in the macula in the left eye. Stratus OCT showed possible microcystoid changes in ...
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  Mentions: Carl Zeiss Meditec UC Davis
12. High-resolution Fourier-Domain Optical Coherence Tomography and Microperimetric Findings After Macula-off Retinal Detachment Repair
  
  Explore OphSource Aug 3 2008 Ophthalmology
  
  Objective To evaluate the morphologic changes in the macula of subjects with repaired macula-off retinal detachment (RD) using high-resolution Fourier-domain optical coherence tomography (FD OCT) and to perform functional correlation in a subset of patients using microperimetry (MP-1). Design Prospective observational case series. Participants Seventeen eyes from 17 subjects who had undergone anatomically successful repair for macula-off, rhegmatogenous RD at least 3 months earlier and without visually significant maculopathy on funduscopy. Methods FD OCT with axial and transverse resolution of 4.5 μm and 10 to 15 μm, respectively, was used to obtain rapid serial B-scans of the macula, which ...
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  Mentions: Carl Zeiss Meditec UC Davis
13. Fourier-Domain Optical Coherence Tomography and Adaptive Optics Reveal Nerve Fiber Layer Loss and Photoreceptor Changes in a Patient With Optic Nerve Drusen.
  
  Explore Journal of Neuro Jun 11 2008 Ophthalmology
  
  June 2008, 28:2 > Fourier-Domain Optical Coherence... ARTICLE LINKS: Fulltext | PDF (822 K) Fourier-Domain Optical Coherence Tomography and Adaptive Optics Reveal Nerve Fiber Layer Loss and Photoreceptor Changes in a Patient With Optic Nerve Drusen. Original Contribution Journal of Neuro-Ophthalmology. 28(2):120-125, June 2008. Choi, Stacey S PhD; Zawadzki, Robert J PhD; Greiner, Mark A MD; Werner, John S PhD; Keltner, John L MD Abstract: Background: New technology allows more precise definit
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  Mentions: Carl Zeiss Meditec UC Davis
14. Ultrahigh-resolution optical coherence tomography with monochromatic and chromatic aberration correction
  
  Explore opticsinfobase.org May 20 2008 Ophthalmology
  
  Robert J. Zawadzki, Barry Cense, Yan Zhang, Stacey S. Choi, Donald T. Miller, John S. Werner. We have developed an improved adaptive optics - optical coherence tomography (AO-OCT) system and evaluated its performance for in vivo imaging of normal and pathologic retina. The instrument provides unprecedented image quality at the retina with isotropic 3D resolution of 3.5 x 3.5 x 3.5 ... [Opt. Express 16, 8126-8143 (2008)]
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  Mentions: UC Davis Indiana University
15. Changes in Cellular Structures Revealed by Ultra-high Resolution Retinal Imaging in Optic Neuropathies
  
  Explore iovs.org Apr 23 2008 Neurology , Ophthalmology
  
  purpose. To study the integrity of inner and outer retinal layers in patients with various types of optic neuropathy by using high-resolution imaging modalities. methods. Three high-resolution imaging systems constructed at the University of California Davis were used to acquire retinal images from patients with optic neuropathy: (1) adaptive optics (AO)-flood–illuminated fundus camera, (2) high-resolution Fourier domain optical coherence tomography (FDOCT), and (3) adaptive optics-Fourier domain optical coherence tomography (AO-FDOCT). The AO fundus camera provides en face images of photoreceptors whereas cross-sectional images (B-scans) of the retina are obtained with both FDOCT and AO-FDOCT. From the volumetric FDOCT ...
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  Mentions: Carl Zeiss Meditec UC Davis
16. Improved representation of retinal data acquired with volumetric FD-OCT: co-registration, visualization and reconstruction of a large field of view
  
  Explore SPIE Digital Library Feb 11 2008 Ophthalmology
  
  Advances in Fourier-domain optical coherence tomography (Fd-OCT) permit visualization of three-dimensional morphology of in-vivo retinal structures in a way that promises to revolutionize clinical and experimental imaging of the retina. The relevance of these advances will be further increased by th ...
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  Mentions: UC Davis
17. Ultra-high resolution adaptive optics: optical coherence tomography for in vivo imaging of healthy and diseased retinal structures
  
  Explore SPIE Digital Library Feb 11 2008 Ophthalmology
  
  Ultra-high isotropic resolution imaging of retinal structures was made possible with an adaptive optics system using dual deformable mirrors and a Fourier-domain optical coherence tomography (Fd-OCT) system with correction for longitudinal chromatic aberration. This system was used to image microsco ... [Proc. SPIE Int. Soc. Opt. Eng. 6844, 684408 (2008)] published Mon Feb 11, 2008.
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  Mentions: Lawrence Livermore National Laboratory UC Davis Indiana University
18. Compact MEMS-based adaptive optics: optical coherence tomography for clinical use
  
  Explore SPIE Digital Library Feb 8 2008 Ophthalmology
  
  We describe a compact MEMS-based adaptive optics (AO) optical coherence tomography (OCT) system with improved AO performance and ease of clinical use. A typical AO system consists of a Shack-Hartmann wavefront sensor and a deformable mirror that measures and corrects the ocular and system aberrations. Because of limitations on current deformable mirror technologies, the amount of real-time ocular-aberration compensation is restricted and small in previous AO-OCT instruments. In this instrument, we incorporate an optical apparatus to correct the spectacle aberrations of the patients such as myopia, hyperopia and astigmatism. This eliminates the tedious process of using trial lenses in clinical ...
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  Mentions: Lawrence Livermore National Laboratory UC Davis
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