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2. Impact of signal strength on quantitative retinal and choriocapillaris flow measurement from optical coherence tomography angiography
  
  Explore Nature Publishing Group Mar 18 2022
  
  We evaluated the impact of signal strength (SS) on quantitative measurements from optical coherence tomography (OCTA). Twenty healthy-volunteers were included. A neutral density filter (NDF) was attached to spectral-domain OCTA (SD-OCTA) and swept-source OCTA (SS-OCTA). All subjects were imaged with both devices three times using three different conditions: no filter, NDF0.3, and NDF0.6. For SD-OCTA, SS decreased from 10.0 to 8.2 and 4.0 with the ...
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  Mentions: Pusan National University UCLA
3. Predictive value of OCT and MRI for postoperative visual recovery in patients with chiasmal compressive lesions
  
  Explore SAGE Journals Jan 11 2022 Ophthalmology
  
  Purpose: We aimed to investigate the predictive value of retinal thickness measured by optical coherence tomography (OCT) and mass biometrics measured using magnetic resonance image (MRI) for visual recovery after surgery for removal of a mass compressing the optic chiasm. Methods: Consecutive patients who showed typical temporal visual field defect (VFD) with respect to the vertical meridian due to a chiasmal compressive mass and who underwent mass removal surgery were ...
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  Mentions: Pusan National University
4. Preclinical mouse model of optical coherence tomography for subcortical brain imaging without dissection
  
  Explore Wiley Online Library Aug 5 2021 Neurology
  
  Background The purpose of this study was to investigate the feasibility of using optical coherence tomography (OCT) to identify internal brain lesions, specifically intracerebral hemorrhage, without dissection. Methods Mice with artificially injected brain hematomas were used to test the OCT system, and the recorded images were compared with microscopic images of the same mouse brains after hematoxylin and eosin staining. Results The intracranial structures surrounding the hematomas were clearly visualized ...
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  Mentions: Pusan National University
5. Full-field optical coherence tomography using tunable-path-difference source for three-dimensional multi-layered imaging with enhanced signal-to-noise ratio
  
  Explore ScienceDirect Jul 28 2021 NDE/NDT
  
  We demonstrate a novel scheme for a full-field optical coherence tomography (FF-OCT) system using a tunable-path-difference source (TPDS). Recently, the comb-spacing-swept source (CSWS) method, including TPDS, has been successfully applied to improve the stability of three-dimensional (3D) time-domain (TD)-FF-OCT imaging by eliminating the mechanical scanning of the reference path, which has been the main source of undesirable noise in general TD-OCT. However, CSWS-OCT has the drawback of a degraded ...
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  Mentions: Pusan National University
6. Visual Field Inference From Optical Coherence Tomography Using Deep Learning Algorithms: A Comparison Between Devices
  
  Explore TVST Journal Jun 5 2021 Ophthalmology
  
  Purpose: To develop a deep learning model to estimate the visual field (VF) from spectral-domain optical coherence tomography (SD-OCT) and swept-source OCT (SS-OCT) and to compare the performance between them. Methods: Two deep learning models based on Inception-ResNet-v2 were trained to estimate 24-2 VF from SS-OCT and SD-OCT images. The estimation performance of the two models was evaluated by using the root mean square error between the actual and estimated ...
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  Mentions: Pusan National University
7. Mammalian Cochlear Hair Cell Imaging Using Optical Coherence Tomography (OCT): A Preliminary Study
  
  Explore advancedotology.org Feb 22 2021 Otolaryngology
  
  Objectives: This study aimed to investigate the feasibility of using optical coherence tomography (OCT) to provide information about cochlear microanatomy at a cellular level, specifically of cochlear hair cells in mammals. Materials and methods: A total of 10 Sprague-Dawley rats were divided into 2 experimental groups for comparing the arrangement of normal and damaged hair cells. Postnatal day 3 Sprague-Dawley rats were used to test the swept-source OCT system, and ...
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  Mentions: Pusan National University
8. Linear-in-wavenumber actively-mode-locked wavelength-swept laser
  
  Explore OSA | OSA Publishing Oct 3 2020 Tunable Sources
  
  We report on an akinetic actively-mode-locked wavelength-swept laser (ASL) with a sweep that is highly linear in wavenumber. By tailoring the drive waveform of the intracavity modulator, the wavenumber sweep was further linearized to enable high fidelity frequency-domain interferometric ranging without resampling of the acquired data. Used for catheter-based optical coherence tomography, the ASL showed comparable imaging performance to a state-of-the-art polygon-based wavelength-swept source at a matching sweep rate of ...
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  Mentions: Massachusetts Institute of Technology Massachusetts General Hospital Harvard University
9. Comparison of optical coherence tomography–guided versus intravascular ultrasound–guided percutaneous coronary intervention: Rationale and design of a randomized, controlled OCTIVUS trial
  
  Explore ScienceDirect Sep 2 2020 Cardiology
  
  Background The clinical value of intracoronary imaging for percutaneous coronary intervention (PCI) guidance is well acknowledged. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) are the most commonly used intravascular imaging to guide and optimize PCI in day-to-day practice. However, the comparative effectiveness of IVUS-guided versus OCT-guided PCI with respect to clinical end points remains unknown. Methods and design The OCTIVUS study is a prospective, multicenter, open-label, parallel-arm, randomized trial ...
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  Mentions: University of Ulsan Pusan National University Korea University
10. Prediction of visual field from swept-source optical coherence tomography using deep learning algorithms
  
  Explore Home - Springer Aug 29 2020 Ophthalmology
  
  Purpose To develop a deep learning method to predict visual field (VF) from wide-angle swept-source optical coherence tomography (SS-OCT) and compare the performance of three Google Inception architectures. Methods Three deep learning models (with Inception-ResNet-v2, Inception-v3, and Inception-v4) were trained to predict 24-2 VF from the macular ganglion cell-inner plexiform layer and the peripapillary retinal nerve fibre layer map obtained by SS-OCT. The prediction performance of the three models was ...
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  Mentions: Pusan National University
11. Impact of Scan Tilt on Quantitative Assessments Using Optical Coherence Tomography Angiography
  
  Explore TVST Journal Aug 25 2020 Ophthalmology
  
  Purpose : To investigate the impact of scan tilt on quantitative assessments using swept-source optical coherence tomography angiography (SS-OCTA) in healthy participants. Methods : Healthy participants were imaged with a SS-OCTA system (PLEX Elite 9000; Carl Zeiss Meditec, Inc, Dublin, CA). After a standard scan was obtained, tilted scans were obtained by moving the optical coherence tomography beam entrance position horizontally. The tilting angle was measured from the B-scan image, and the ...
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  Mentions: Carl Zeiss Meditec Pusan National University UCLA
12. Comparison of optical coherence tomography-guided versus intravascular ultrasound-guided percutaneous coronary intervention: Rationale and Design of a Randomized, controlled OCTIVUS trial
  
  Explore ScienceDirect Aug 13 2020 Cardiology
  
  The clinical value of intracoronary imaging for percutaneous coronary intervention (PCI) guidance is well acknowledged. Intravascular ultrasound (IVUS) and optical coherence tomography (OCT) are the most common use for intravascular imaging to guide and optimize PCI in day-to-day practice. However, the comparative effectiveness of IVUS-guided and OCT-guided PCI with respect to clinical end points remains unknown. Methods and Design The OCTIVUS study is a prospective, multicenter, open-label, parallel-arm, randomized trial ...
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  Mentions: University of Ulsan Yonsei University Pusan National University
13. SD-OCT parameters and visual field defect in chiasmal compression and the diagnostic value of neural network model
  
  Explore SAGE Journals Aug 8 2020 Ophthalmology
  
  Purpose: To evaluate the peripapillary retinal nerve fiber layer (RNFL) and macular ganglion cell-inner plexiform layer (GCIPL) measurements using spectral domain optical coherence tomography (SD-OCT) in patients with chiasmal compression and analyze the diagnostic value of a neural network model. Methods: Forty-seven patients with chiasmal compressive disorder were recruited and divided into two groups depending on the visual field defect (perimetric; group 1 and preperimetric; group 2). Fifty-seven normal subjects ...
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  Mentions: Pusan National University
14. A deep learning approach to predict visual field using optical coherence tomography
  
  Explore Journals | PLOS Jul 7 2020 Ophthalmology
  
  We developed a deep learning architecture based on Inception V3 to predict visual field using optical coherence tomography (OCT) imaging and evaluated its performance. Two OCT images, macular ganglion cell-inner plexiform layer (mGCIPL) and peripapillary retinal nerve fibre layer (pRNFL) thicknesses, were acquired and combined. A convolutional neural network architecture was constructed to predict visual field using this combined OCT image. The root mean square error (RMSE) between the actual ...
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  Mentions: Pusan National University
15. Perioperative intraretinal fluid observed using optical coherence tomography in the epiretinal membrane
  
  Explore Home - Springer Jan 25 2020 Ophthalmology
  
  Background Postoperative intraretinal fluid (IRF) is reportedly associated with visual outcomes after epiretinal membrane (ERM) surgery. However, preoperative IRF is common, and persistent IRF would have different impact on visual function from postoperative newly developed IRF. Therefore, we aimed to investigate the incidence rate and clinical implications of perioperative IRF in ERM. Methods Medical records of patients who underwent vitrectomy for idiopathic ERM between January 2014 and January 2017 were ...
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  Mentions: Pusan National University
16. Extratympanic Observation of Middle and Inner Ear Structures in Rodents Using Optical Coherence Tomography
  
  Explore e-ceo.org Nov 5 2019 Otolaryngology
  
  Objectives. This study aimed to investigate whether optical coherence tomography (OCT) provides useful information about the microstructures of the middle and inner ear via extratympanic approach and thereby could be utilized as an alternative diagnostic technology in ear imaging. Method. Five rats and mice were included, and the swept-source OCT system was applied to confirm the extent of visibility of the middle and inner ear and measure the length or ...
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  Mentions: Pusan National University
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