Articles that mention Hiroshi Ishikawa -Optical Coherence Tomography News

Hiroshi Ishikawa

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1. Mentioned In 93 Articles
2. Retinal blood flow reduction in normal-tension glaucoma with single-hemifield damage by Doppler optical coherence tomography
  
  Explore BJO Online Mar 31 2020 Ophthalmology
  
  Aims To evaluate the associations between retinal blood flow (RBF) and optical coherence tomography (OCT) structural measurements in normal-tension glaucoma (NTG) eyes with single-hemifield visual field (VF) damage by the Doppler OCT. Methods The Doppler OCT was used to measure temporal artery (TA) RBF and temporal vein (TV) RBF. Retinal nerve fibre layer thickness (RNFLT) was measured by spectral-domain OCT. Results Forty-three consecutive eyes of 43 patients with NTG with ...
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  Mentions: Joel S. Schuman Gadi Wollstein Hiroshi Ishikawa
3. 3D-CNN for Glaucoma Detection Using Optical Coherence Tomography
  
  Explore Home - Springer Oct 15 2019 Ophthalmology
  
  The large size of raw 3D optical coherence tomography (OCT) volumes poses challenges for deep learning methods as it cannot be accommodated on a single GPU in its original resolution. The direct analysis of these volumes however, provides advantages such as circumventing the need for the segmentation of retinal structures. Previously, a deep learning (DL) approach was proposed for the detection of glaucoma directly from 3D OCT volumes, where the ...
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  Mentions: Joel S. Schuman Gadi Wollstein Hiroshi Ishikawa
4. Speckle reduction in visible-light optical coherence tomography using scan modulation
  
  Explore SPIE Digital Library Sep 4 2019 Ophthalmology
  
  We present a technique to reduce speckle in visible-light optical coherence tomography (vis-OCT) that preserves fine structural details and is robust against sample motion. Specifically, we locally modulate B-scans orthogonally to their axis of acquisition. Such modulation enables acquisition of uncorrelated speckle patterns from similar anatomical locations, which can be averaged to reduce speckle. To verify the effectiveness of speckle reduction, we performed in-vivo retinal imaging using modulated raster and ...
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  Mentions: Joel S. Schuman Hiroshi Ishikawa Northwestern University
5. Inference of visual field test performance from OCT volumes using deep learning
  
  Explore arxiv.org Aug 10 2019 Ophthalmology
  
  Visual field tests (VFT) are pivotal for glaucoma diagnosis and conducted regularly to monitor disease progression. Here we address the question to what degree aggregate VFT measurements such as Visual Field Index (VFI) and Mean Deviation (MD) can be inferred from Optical Coherence Tomography (OCT) scans of the Optic Nerve Head (ONH) or the macula. Accurate inference of VFT measurements from OCT could reduce examination time and cost. We propose ...
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  Mentions: Joel S. Schuman Gadi Wollstein Hiroshi Ishikawa
6. A feature agnostic approach for glaucoma detection in OCT volumes
  
  Explore Journals | PLOS Jul 1 2019 Ophthalmology
  
  ...ameter, and neuroretinal rim thinning at the superior and inferior segments. Citation: Maetschke S, Antony B, Ishikawa H, Wollstein G, Schuman J, Garnavi R (2019) A feature agnostic approach for glaucoma detection in OCT...
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  Mentions: Joel S. Schuman Gadi Wollstein Hiroshi Ishikawa
7. Designing visible-light optical coherence tomography towards clinics
  
  Explore Home May 28 2019
  
  Background: The capabilities of visible-light optical coherence tomography (vis-OCT) in noninvasive anatomical and functional retinal imaging have been demonstrated by multiple groups in both rodents and healthy human subjects. Translating laboratory prototypes to an integrated clinical-environment-friendly system is required to explore the full potential of vis-OCT in disease management. Methods: We developed and optimized a portable vis-OCT system for human retinal imaging in clinical settings. We acquired raster- and circular-scan ...
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  Mentions: Joel S. Schuman Gadi Wollstein Hiroshi Ishikawa
8. Quantitative assessment of outer retinal folds on enface optical coherence tomography after vitrectomy for rhegmatogenous retinal detachment
  
  Explore Nature Publishing Group Feb 23 2019 Ophthalmology
  
  We aimed to investigate the possible causes of metamorphopsia for rhegmatogenous retinal detachment (RRD) based on findings of enface optical coherence tomography (OCT). The study was a retrospective, consecutive case series of 33 eyes with macula-off RRD. Metamorphopsia was measured by M-CHARTS and enface OCT images covering a macular area of 66mm square obtained at 1, 3, and 6 months postoperatively. Within the outer retinal slabs of enface OCT, multiple ...
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  Mentions: Hiroshi Ishikawa
9. Retinal optical coherence tomography image enhancement via deep learning
  
  Explore OSA | OSA Publishing Nov 17 2018
  
  Optical coherence tomography (OCT) images of the retina are a powerful tool for diagnosing and monitoring eye disease. However, they are plagued by speckle noise, which reduces image quality and reliability of assessment. This paper introduces a novel speckle reduction method inspired by the recent successes of deep learning in medical imaging. We present two versions of the network to reflect the needs and preferences of different end-users. Specifically, we ...
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  Mentions: Joel S. Schuman Gadi Wollstein Hiroshi Ishikawa
10. Classification of healthy and diseased retina using SD-OCT imaging and Random Forest algorithm
  
  Explore Journals | PLOS Jun 4 2018 Ophthalmology
  
  ...ed method showed the best accuracy. Citation: Hussain MA, Bhuiyan A, D. Luu C, Theodore Smith R, H. Guymer R, Ishikawa H, et al. (2018) Classification of healthy and diseased retina using SD-OCT imaging and Random Forest...
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  Mentions: Duke University Joel S. Schuman Singapore Eye Research Institute
11. An Automated Method for Choroidal Thickness Measurement from Enhanced Depth Imaging Optical Coherence Tomography Images
  
  Explore ScienceDirect Jan 13 2018
  
  The choroid is vascular tissue located underneath the retina and supplies oxygen to the outer retina; any damage to this tissue can be a precursor to retinal diseases. This paper presents an automated method of choroidal segmentation from enhanced depth imaging optical coherence tomography (EDI-OCT) images. The Dijkstra shortest path algorithm is used to segment the choroid-sclera interface (CSI), the outermost border of the choroid. A novel intensity-normalisation technique that ...
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  Mentions: Joel S. Schuman Hiroshi Ishikawa University of Melbourne
12. Signal normalization among multiple optical coherence tomography devices
  
  Explore uspto.gov Dec 19 2017 Patents
  
  The present disclosure is directed to systems and methods for normalizing an image of an eye among multiple optical coherence tomography (OCT) devices. The system can receive an OCT image and generate a normalized OCT image. The system is configured to normalize a sample density of the received image, normalize an amount of noise using a suitable noise reduction technique, normalize a distribution of signal amplitudes of the image, and ...
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  Mentions: University of Pittsburgh Joel S. Schuman Gadi Wollstein
13. Signal Normalization Reduces Image Appearance Disparity Among Multiple Optical Coherence Tomography Devices
  
  Explore TVST Journal Mar 7 2017 Ophthalmology
  
  Purpose : To assess the effect of the previously reported optical coherence tomography (OCT) signal normalization method on reducing the discrepancies in image appearance among spectral-domain OCT (SD-OCT) devices. Methods : Healthy eyes and eyes with various retinal pathologies were scanned at the macular region using similar volumetric scan patterns with at least two out of three SD-OCT devices at the same visit (Cirrus HD-OCT, Zeiss, Dublin, CA; RTVue, Optovue, Fremont, CA ...
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  Mentions: University of Pittsburgh Optovue Heidelberg Engineering
14. Establishing compatibility between two- and three-dimensional optical coherence tomography scans
  
  Explore uspto.gov Dec 6 2016 Ophthalmology , Patents
  
  Advances in optical coherence tomography (OCT) have prompted a transition from time domain OCT, providing 2D OCT images, to spectral domain OCT, which has a 3D imaging capability. Yet conventional technology offers little toward the goal of inter-device compatibility between extant 2D OCT images and newer 3D OCT images for the same or comparable subjects, as in the context of ongoing monitoring the quantitative status of a patient's eyes ...
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  Mentions: University of Pittsburgh Joel S. Schuman Gadi Wollstein
15. Optic Nerve Head Measurements With Optical Coherence Tomography: A Phantom-Based Study Reveals Differences Among Clinical Devices
  
  Explore IOVS Journal Jul 14 2016 Ophthalmology
  
  Purpose : Optical coherence tomography (OCT) can monitor for glaucoma by measuring dimensions of the optic nerve head (ONH) cup and disc. Multiple clinical studies have shown that different OCT devices yield different estimates of retinal dimensions. We developed phantoms mimicking ONH morphology as a new way to compare ONH measurements from different clinical OCT devices. Methods : Three phantoms were fabricated to model the ONH: One normal and two with glaucomatous ...
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  Mentions: University of Pittsburgh Joel S. Schuman Daniel X. Hammer
16. Virtual Averaging Making Nonframe-Averaged Optical Coherence Tomography Images Comparable to Frame-Averaged Images
  
  Explore TVST Journal Jan 18 2016 Ophthalmology
  
  Purpose : Developing a novel image enhancement method so that nonframe-averaged optical coherence tomography (OCT) images become comparable to active eye-tracking frame-averaged OCT images. Methods : Twenty-one eyes of 21 healthy volunteers were scanned with noneye-tracking nonframe-averaged OCT device and active eye-tracking frame-averaged OCT device. Virtual averaging was applied to nonframe-averaged images with voxel resampling and adding amplitude deviation with 15-time repetitions. Signal-to-noise (SNR), contrast-to-noise ratios (CNR), and the distance between the ...
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  Mentions: University of Pittsburgh Joel S. Schuman Larry Kagemann
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