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optical coherence tomograph

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https://www.readbyqxmd.com/read/29730368/marking-technique-for-identification-of-optimal-stent-landing-site-with-optical-coherence-tomographic-imaging
#1
Yuichi Nakamura, Yu Kataoka, Yasuhide Asaumi, Teruo Noguchi, Satoshi Yasuda
No abstract text is available yet for this article.
April 27, 2018: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29705008/repeatability-of-automatic-measurements-by-a-new-anterior-segment-optical-coherence-tomographer-combined-with-placido-topography-and-agreement-with-2-scheimpflug-cameras
#2
Giacomo Savini, Domenico Schiano-Lomoriello, Kenneth J Hoffer
PURPOSE: To evaluate the repeatability of automatic measurements by a new anterior segment optical coherence tomographer (AS-OCT) combined with Placido topography and their agreement with those provided by 2 rotating Scheimpflug cameras. SETTING: G.B. Bietti Foundation IRCCS, Rome, Italy. DESIGN: Evaluation of a diagnostic test instrument. METHODS: Unoperated eyes and eyes with previous myopic excimer laser surgery were analyzed...
April 25, 2018: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/29682359/optical-coherence-tomographic-study-of-a-chronically-retained-coronary-guidewire
#3
Natasha Corballis, Sreekumar Sulfi, Alisdair Ryding
Guidewire entrapment is a rare complication of coronary intervention, and management depends on the individual circumstances. This is a case of an urgent percutaneous coronary angioplasty in which a guidewire became entrapped behind a bare metal stent with subsequent fracture of the core filament, which could not be retrieved. Using optical coherence tomography, our case demonstrates extensive tissue coverage of the retained guidewire at twelve months. Five-year follow-up suggests that retained guidewires can be managed without long-term anticoagulation, even when there is substantial intra-aortic material...
2018: Case Reports in Cardiology
https://www.readbyqxmd.com/read/29677360/distinctive-analysis-of-macular-superficial-capillaries-and-large-vessels-using-optical-coherence-tomographic-angiography-in-healthy-and-diabetic-eyes
#4
Jianqin Lei, Enhui Yi, Yan Suo, Cheng Chen, Xiayu Xu, Wenxiang Ding, Nizar Saleh Abdelfattah, Xiaojuan Fan, Huiqin Lu
Purpose: To quantify and evaluate macular superficial capillaries and large vessels separately using an optical coherence tomographic angiography (OCTA)-based automatic segmentation algorithm. Methods: In this cross-sectional study, all eyes were scanned using an OCTA device with 3 × 3 mm cube centered on the fovea. Retinal large vessels (arterioles/venules) were automatically segmented from superficial vasculature en-face images. All images were normalized, binarized, and skeletonized for quantification...
April 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29629239/sub-airy-confocal-adaptive-optics-scanning-ophthalmoscopy
#5
Nripun Sredar, Oladipo E Fagbemi, Alfredo Dubra
Purpose: To demonstrate the viability of improving transverse image resolution in reflectance scanning adaptive optics ophthalmoscopy using sub-Airy disk confocal detection. Methods: The foveal cone mosaic was imaged in five human subjects free of known eye disease using two custom adaptive optics scanning light ophthalmoscopes (AOSLOs) in reflectance with 7.75 and 4.30 mm pupil diameters. Confocal pinholes of 0.5, 0.6, 0.8, and 1.0 Airy disk diameters (ADDs) were used in a retinal conjugate plane before the light detector...
April 2018: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/29627301/effect-of-age-in-the-ciliary-muscle-during-accommodation-sectorial-analysis
#6
Alberto Domínguez-Vicent, Daniel Monsálvez-Romín, José J Esteve-Taboada, Robert Montés-Micó, Teresa Ferrer-Blasco
PURPOSE: To compare changes in the ciliary muscle area at different sectors between pre-presbyopic and presbyopic eyes during accommodation by means of an anterior segment optical coherence tomographer (OCT). METHODS: The anterior ciliary muscle area was measured in 20 healthy and phakic pre-presbyopic eyes, whose mean age was 23.3±4.4 years, and in 20 healthy and phakic presbyopic eyes, whose mean age was 46.5±5.2 years. The relative change in the cross-sectional area of the ciliary muscle was measured at the nasal, inferior, and temporal sectors between 0 and -3 D of vergence, in -1 D step...
April 4, 2018: Journal of Optometry
https://www.readbyqxmd.com/read/29621390/association-of-myopia-with-peripapillary-perfused-capillary-density-in-patients-with-glaucoma-an-optical-coherence-tomography-angiography-study
#7
Yanin Suwan, Masoud Aghsaei Fard, Lawrence S Geyman, Apichat Tantraworasin, Toco Y Chui, Richard B Rosen, Robert Ritch
Importance: This study used optical coherence tomographic angiography to assess for impaired blood flow in myopic eyes with or without open-angle glaucoma. Objective: To compare the peripapillary perfused capillary density (PCD) between eyes with and without glaucoma. Design, Setting, and Participants: In this cross-sectional study at a tertiary glaucoma referral practice, we recruited patients with myopic eyes of spherical equivalent of more than -3...
April 5, 2018: JAMA Ophthalmology
https://www.readbyqxmd.com/read/29573036/three-dimensional-visualization-of-rat-retina-by-x-ray-differential-phase-contrast-tomographic-microscopy
#8
Xue-Huan Liu, Hong-Xia Yin, Hua Zhu, Zhen-Tian Wang, Peng-Fei Zhao, Han Lv, He-Yu Ding, Jing Li, Peng Zhang, Zheng Wang, Peng Wang, Zhen-Chang Wang
The retina is one of the most tiny and sophisticated tissues of the body. Three dimensional (3D) visualization of the whole retina is valuable both in clinical and research arenas. The tissue has been predominantly assessed by time-consuming histopathology and optical coherence tomography (OCT) in research and clinical arenas. However, none of the two methods can provide 3D imaging of the retina. The purpose of this study is to give a volumetric visualization of rat retina at submicron resolution, using an emerging imaging technique-phase-contrast X-ray CT...
March 23, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29564760/dynamic-imaging-of-mouse-embryos-and-cardiodynamics-in-static-culture
#9
Andrew L Lopez, Irina V Larina
The heart is a dynamic organ that quickly undergoes morphological and mechanical changes through early embryonic development. Characterizing these early moments is important for our understanding of proper embryonic development and the treatment of heart disease. Traditionally, tomographic imaging modalities and fluorescence-based microscopy are excellent approaches to visualize structural features and gene expression patterns, respectively, and connect aberrant gene programs to pathological phenotypes. However, these approaches usually require static samples or fluorescent markers, which can limit how much information we can derive from the dynamic and mechanical changes that regulate heart development...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29555408/scleral-contact-lens-thickness-profiles-the-relationship-between-average-and-centre-lens-thickness
#10
Stephen J Vincent, David Alonso-Caneiro, Henry Kricancic, Michael J Collins
PURPOSE: To develop a methodology to reliably determine the thickness profile of scleral contact lenses and examine the relationship between the centre and average lens thickness for a range of lens designs and back vertex powers. METHODS: High-resolution images of 37 scleral trial lenses (Epicon LC, Rose K2 XL and ICD 16.5) were captured using an optical coherence tomographer, and their thickness profiles were generated after correcting for known measurement artefacts...
March 16, 2018: Contact Lens & Anterior Eye: the Journal of the British Contact Lens Association
https://www.readbyqxmd.com/read/29554051/intravitreal-injections-of-ziv-aflibercept-for-the-treatment-of-a-patient-with-macular-edema-secondary-to-branch-retinal-vein-occlusion
#11
Gabriel Costa de Andrade, João Rafael de Oliveira Dias, André Maia, Michel Eid Farah, Somaia Mitne, Eduardo Büchele Rodrigues
PURPOSE: To describe the visual, tomographic, and electroretinographic findings in a patient with macular edema secondary to branch retinal vein occlusion who was submitted to three consecutive intravitreal injections of ziv-aflibercept. METHODS: The patient underwent a complete ophthalmic examination, as well as optical coherence tomography and full-field electroretinography at baseline and 90 days after the first injection. RESULTS: The best-corrected visual acuity improved from 20/400 to 20/40, and the central retinal thickness decreased from 791 μm to 198 μm after three consecutive intravitreal injections of ziv-aflibercept...
April 2018: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/29550091/optical-coherence-tomographic-image-pattern-of-metallic-bioresorbable-vascular-scaffold-restenosis
#12
Jessica Roa-Garrido, Rosa M Cardenal-Piris, Ahmed Mahmoud El Amrawy, Antonio Gomez-Menchero, Santiago Camacho Freire, Jose Francisco Diaz-Fernandez
No abstract text is available yet for this article.
March 8, 2018: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29543200/-evaluation-of-yag-laser-vitreolysis-effectiveness-based-on-quantitative-characterization-of-vitreous-floaters
#13
V A Shaimova, T B Shaimov, R B Shaimov, A Yu Galin, Zh A Goloshchapova, P K Ryzhkov, A V Fomin
PURPOSE: To develop methods for evaluating effectiveness of YAG-laser vitreolysis of vitreous floaters. MATERIAL AND METHODS: The study included 144 patients (173 eyes) who had underwent YAG-laser vitreolysis and were under observation from 01.09.16 to 31.01.18. The patients were 34 to 86 years old (mean age 62.7±10.2 years), 28 (19.4%) patients were male, 116 (80.6%) - female. All patients underwent standard and additional examination: ultrasonography (Accutome B-scan plus, U...
2018: Vestnik Oftalmologii
https://www.readbyqxmd.com/read/29541517/quantitative-biometry-of-zebrafish-retinal-vasculature-using-optical-coherence-tomographic-angiography
#14
Ivan Bozic, Xiaoyue Li, Yuankai Tao
The zebrafish is a robust model for studying human ophthalmic function and disease because of its fecundity, life-cycle, and similarities between its retinal structure and the human retina. Here, we demonstrate longitudinal in vivo imaging of retinal structure using optical coherence tomography (OCT) and noninvasive retinal vascular perfusion imaging using OCT angiography (OCT-A) in zebrafish. In addition, we present methods for retinal vascular segmentation and biometry to quantify vessel branch length, curvature, and angle...
March 1, 2018: Biomedical Optics Express
https://www.readbyqxmd.com/read/29517158/bilateral-retinoschisis-in-a-dog-a-veterinary-clinical-application-for-optical-coherence-tomography
#15
Elizabeth A F Schaefer, Rebecca E H Whiting, Jacqueline W Pearce, Bruce H Grahn, Charles W Hamm, Cecil P Moore, Kristina L Narfström
A 11-year-old neutered male Labrador retriever-cross dog was presented to the University of Missouri-Columbia Veterinary Ophthalmology Service for subtle visual deficits. Indirect ophthalmoscopy revealed a smooth, bullous elevation in the superior-temporal retina OU. Optical coherence tomography (OCT) performed OU showed inner retinal separation consistent with retinoschisis. Electroretinography (ERG) revealed markedly reduced b-wave amplitudes in the more severely affected eye (OD) compared with the less severely affected eye (OS)...
March 8, 2018: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/29485196/evaluation-of-laser-ablation-microtomy-for-correlative-microscopy-of-hard-tissues
#16
A Boyde
Laser ablation machining or microtomy (LAM) is a relatively new approach to producing slide mounted sections of translucent materials. We evaluated the method with a variety of problems from the bone, joint and dental tissues fields where we require thin undecalcified and undistorted sections for correlative light microscopy (LM) and backscattered electron scanning electron microscopy (BSE SEM). All samples were embedded in poly-methylmethacrlate (PMMA) and flat block surfaces had been previously studied by BSE-SEM and confocal scanning light microscopy (CSLM)...
February 27, 2018: Journal of Microscopy
https://www.readbyqxmd.com/read/29482368/comparison-of-corneal-tomography-repeatability-precision-misalignment-mean-elevation-and-mean-pachymetry
#17
Simon Schröder, Stephanie Mäurer, Timo Eppig, Berthold Seitz, Kathrin Rubly, Achim Langenbucher
PURPOSE: To compare corneal tomography and its statistical uncertainty for measurements obtained by three clinically used corneal tomographers: A Scheimpflug camera (Pentacam HR), a swept source optical coherence tomography system (CASIA SS-1000), and Placido ring imaging (TMS-5). MATERIAL AND METHODS: Repeated measurements with all three devices on 34 normal eyes were used to estimate the repeatability, precision, and mean values of corneal elevation and pachymetry within 8 mm diameter...
February 26, 2018: Current Eye Research
https://www.readbyqxmd.com/read/29479786/in-vivo-optical-coherence-tomography-imaging-in-a-case-of-mucous-membrane-pemphigoid-and-a-negative-nikolsky-s-sign
#18
Giorgia Capocasale, Vera Panzarella, Vito Rodolico, Olga Di Fede, Giuseppina Campisi
There is currently a growing interest in new diagnostic tools of the oral cavity and mucosa which are non-invasive, repeatable and reliable. A diagnosis of a suspected, autoimmune pathology was made regarding a 57-year-old patient with desquamative gingivitis. However, a negative Nikolsky's sign did not seem to indicate a diagnosis of mucous membrane pemphigoid neither was there any indication as to the optimum location for an incisional biopsy. As an imaging method, the use of optical coherence tomography (OCT) has enabled the obtaining of tomographic (cross-sectional) scans of tissue...
May 2018: Journal of Dermatology
https://www.readbyqxmd.com/read/29475357/virtual-phase-conjugation-based-optical-tomography-for-single-shot-three-dimensional-imaging
#19
Yuta Goto, Atsushi Okamoto, Atsushi Shibukawa, Kazuhisa Ogawa, Akihisa Tomita
We propose a virtual phase conjugation (VPC) based optical tomography (VPC-OT) for realizing single-shot optical tomographic imaging systems. Using a computer-based numerical beam propagation, the VPC combines pre-modulation and post-demodulation of the probe beam's wavefront, which provides an optical sectioning capability for resolving the depth coordinates. In VPC-OT, the physical optical microscope system and VPC are coupled using digital holography. Therefore, in contrast to conventional optical tomographic imaging (OTI) systems, this method does not require additional elements such as low-coherence light sources or confocal pinholes...
February 19, 2018: Optics Express
https://www.readbyqxmd.com/read/29470970/comparisons-between-histology-and-optical-coherence-tomography-angiography-of-the-periarterial-capillary-free-zone
#20
Chandrakumar Balaratnasingam, Dong An, Yoichi Sakurada, Cecilia S Lee, Aaron Y Lee, Ian L McAllister, K Bailey Freund, Marinko Sarunic, Dao-Yi Yu
PURPOSE: To use the capillary-free zone along retinal arteries, a physiologic area of superficial avascularization, as an anatomic paradigm to investigate the reliability of optical coherence tomography angiography (OCTA) for visualizing the deep retinal circulation. DESIGN: Validity analysis and laboratory investigation. METHODS: Five normal human donor eyes (mean age 69.8 years) were perfusion-labeled with endothelial antibodies and the capillary networks of the perifovea were visualized using confocal scanning laser microscopy...
May 2018: American Journal of Ophthalmology
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