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optic coherence tomography

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https://www.readbyqxmd.com/read/28742840/glaucomatous-changes-in-lamina-pores-shape-within-the-lamina-cribrosa-using-wide-bandwidth-femtosecond-mode-locked-laser-oct
#1
Takuhei Shoji, Hiroto Kuroda, Masayuki Suzuki, Hisashi Ibuki, Makoto Araie, Shin Yoneya
PURPOSE: The lamina cribrosa (LC) is known to play a critical role in the pathogenesis of glaucoma. Although it has been reported that striae-shaped or slit-shaped lamina pores are more frequent in eyes with primary open angle glaucoma (POAG), this observation is based only on fundus photography. The primary object of this study is to perform layer-by-layer comparisons of the shape of lamina pores within the LC in vivo. DESIGN: Cross-sectional study. METHODS: Optic nerve head B-scans were obtained using custom-made broad-wavelength optical coherence tomography with a mode-locked laser...
2017: PloS One
https://www.readbyqxmd.com/read/28742160/sub-classification-of-myopic-glaucomatous-eyes-according-to-optic-disc-and-peripapillary-features
#2
Seungbong Han, Kyung Rim Sung, Jimin Park, Joo Young Yoon, Joong Won Shin
PURPOSE: To investigate the sub-classification of myopic glaucomatous eyes by optic disc and peripapillary features. METHODS: Optic disc tilt and torsion were determined from retinal nerve fiber layer photographs. Based on the location of the Bruch's membrane (BM) opening within the β-zone of the peripapillary atrophy (PPA) area, the widths of β-zone PPA (PPA1W), PPA+BM (PPA2W), and PPA-BM (PPA3W) were measured with enhanced depth imaging spectral-domain optical coherence tomography...
2017: PloS One
https://www.readbyqxmd.com/read/28741575/the-drug-eluting-absorbable-magnesium-vascular-scaffold-in-complex-coronary-bifurcations-insights-from-an-in-vivo-multimodality-imaging-study
#3
Johan Bennett, Maarten Vanhaverbeke, Nina Vanden Driessche, Nick Hiltrop, Tom Adriaenssens, Walter Desmet, Peter Sinnaeve, Christophe Dubois
AIMS: This acute in-vivo study sought to provide insights regarding the feasibility of performing complex bifurcation stenting with Magmaris magnesium-alloy bioresorbable scaffolds (Biotronik,Bulach, Switzerland). METHODS AND RESULTS: Twenty-five New-Zealand-White rabbits underwent stenting of non-diseased aorto-iliac bifurcations with Magmaris using provisional (PS,n=5), culotte (n=6), modified-T (n=6), or T-and-protrusion (TAP,n=8) stenting techniques. Angiography, optical coherence tomography and micro-computed tomography were performed...
July 25, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28741406/balanced-endoscopic-medial-and-transcutaneous-lateral-orbital-decompression-in-graves-orbitopathy
#4
Estefanía Hernández-García, J Javier San-Román, Ramón González, Araceli Nogueira, Ignacio Genol, Bazil Stoica, Nicolás Toledano, Guillermo Plaza
BACKGROUND: To determine the clinical outcomes and morbidity of endoscopic medial wall combined with transcutaneous lateral orbital wall decompression in Graves' orbitopathy. METHODOLOGY: A retrospective noncomparative case series of patients who underwent surgical decompression for Graves' orbitopathy at Hospital Universitario de Fuenlabrada between 2004 and 2014 was performed. We reviewed the patients' charts and analyzed before and after the decompression, the visual acuity (Snellen chart), optic nerve compression (fundoscopy and optic coherence tomography), exophthalmometry (Hertel measurement), ocular motility, diplopia, eyelid surgery needed after decompression and its possible complications...
July 25, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28740735/structure-and-function-relationship-of-activated-retinal-glia-in-primary-open-angle-glaucoma-patients
#5
Christoph Nützi, Andreas Schötzau, Matthias C Grieshaber
PURPOSE: To evaluate clinically activated retinal astrocytes and Müller cells (ARAM) regarding retinal sensitivity and retinal nerve fiber layer (RNFL) thickness in primary open-angle glaucoma (POAG). METHODS: Central visual field (VF; i.e., retinal sensitivity) was measured with a custom-made macular pattern by microperimetry and correlated with the presence (ARAM+) or absence (ARAM-) of ARAM on red-free fundus photography and with the corresponding RNFL by optical coherence tomography (OCT)...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28740734/effect-of-topical-nepafenac-on-central-foveal-thickness-following-panretinal-photocoagulation-in-diabetic-patients
#6
Nahla B Abu Hussein, Ahmed A Mohalhal, Dalia A Ghalwash, Ahmed A Abdel-Kader
PURPOSE: To evaluate effectiveness of topical nepafenac in reducing macular edema following panretinal photocoagulation (PRP). DESIGN: Prospective randomized double-blinded controlled study. METHODS: Sixty eyes of 60 patients having proliferative or severe nonproliferative diabetic retinopathy had PRP. Patients were then divided into two groups: nepafenac group (30 eyes) receiving 1% topical nepafenac eye drops for 6 months and control group (30 eyes) receiving carboxymethylcellulose eye drops for 6 months...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28740643/optical-coherence-tomography-vs-intravascular-ultrasound-guided-percutaneous-coronary-intervention
#7
EDITORIAL
Lorenz Räber, Yasushi Ueki
No abstract text is available yet for this article.
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28740362/scleral-wound-healing-with-cross-link-technique-using-riboflavin-and-ultraviolet-a-on-rabbit-eyes
#8
Nadyr A Damasceno, Nadia C Miguel, Marcelo Palis Ventura, Miguel Burnier, Marcos P Avila, Eduardo F Damasceno
PURPOSE: The aim of study was to evaluate the cross-link using riboflavin and ultraviolet A (UVA) for improving scleral wound healing. MATERIALS AND METHODS: This was an experimental study involving four New Zealand rabbits (eight eyes). Therapy procedure was chosen for the right eye and control procedure for the left one. UVA irradiation of 365 nm with a surface irradiance of 3 mW/cm(2) and a photosensitizer of riboflavin drops were applied for 30 minutes on the right eye at 2 mm from the limbus...
2017: Clinical Ophthalmology
https://www.readbyqxmd.com/read/28739645/repeatability-of-vessel-density-measurements-of-optical-coherence-tomography-angiography-in-normal-and-glaucoma-eyes
#9
Jayasree P Venugopal, Harsha L Rao, Robert N Weinreb, Zia S Pradhan, Srilakshmi Dasari, Mohammed Riyazuddin, Narenda K Puttiah, Dhanraj A S Rao, Sathi Devi, Kaweh Mansouri, Carroll Ab Webers
AIMS: To compare the intrasession repeatability of peripapillary and macular vessel density measurements of optical coherence tomography angiography (OCTA) in normal and glaucoma eyes, and to evaluate the effect of signal strength of OCTA scans on the repeatability. METHODS: In a cross-sectional study, three optic nerve head scans each of 65 eyes (30 normal, 35 glaucoma eyes) and three macular scans each of 69 eyes (35 normal, 34 glaucoma eyes) acquired in the same session with OCTA were analysed...
July 24, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28739552/an-assessment-of-retinal-nerve-fiber-layer-thickness-in-non-diabetic-obese-children-and-adolescents
#10
Bediz Özen, Hakan Öztürk, Gönül Çatlı, Bumin Dündar
OBJECTIVE: Obesity affects almost all systems in the body and can also cause injury to the retinal nerve fibers due to a chronic inflammatory processAim: To determine changes in retinal nerve fiber layer (RNFL) thickness in non-diabetic children and adolescents using optical coherence tomography (OCT) and to evaluate the relation between this change and metabolic risk factors and pubertal stage. METHODS: Thirty eight obese and 40 healthy children and adolescents aged 10-18 years were included...
July 24, 2017: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/28738419/posterior-staphylomas-in-pathologic-myopia-imaged-by-widefield-optical-coherence-tomography
#11
Kosei Shinohara, Noriaki Shimada, Muka Moriyama, Takeshi Yoshida, Jost B Jonas, Nagahisa Yoshimura, Kyoko Ohno-Matsui
Purpose: To examine posterior staphylomas by widefield optical coherence tomography (WF-OCT) and three-dimensional magnetic resonance imaging (3D-MRI). Methods: Highly myopic patients (myopic refractive error >8.0 diopters or axial length >26.5 mm) who had previously undergone orbital 3D-MRI were examined by WF-OCT. Results: The study included 100 eyes of 57 patients with a mean age of 67.9 ± 10.7 years (range, 44-85 years) and mean axial length of 30...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28738134/indocyanine-green-angiography-and-optical-coherence-tomography-angiography-of-choroidal-neovascularization-in-age-related-macular-degeneration
#12
Chiara M Eandi, Antonio Ciardella, Mariacristina Parravano, Filippo Missiroli, Camilla Alovisi, Chiara Veronese, Maria C Morara, Massimo Grossi, Gianni Virgili, Federico Ricci
Purpose: To compare the capability of indocyanine green angiography (ICGA) and optical coherence tomography angiography (OCTA) in detecting choroidal neovascularization (CNV). Methods: In this prospective study, patients with CNV detected with fluorescein angiography (FA) underwent ICGA and OCTA, spectral domain OCT (SD-OCT), and infrared or fundus color photographs. CNV lesions were outlined on ICGA and OCTA images, and the composition and size of the CNV was documented...
July 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28737601/new-ways-to-detect-pediatric-sickle-cell-retinopathy-a-comprehensive-review
#13
Daniel A Pahl, Nancy S Green, Monica Bhatia, Royce W S Chen
Sickle retinopathy reflects disease-related vascular injury of the eye, which can potentially result in visual loss from vitreous hemorrhage or retinal detachment. Here we review sickle retinopathy among children with sickle cell disease, describe the epidemiology, pediatric risk factors, pathophysiology, ocular findings, and treatment. Newer, more sensitive ophthalmological imaging modalities are available for retinal imaging, including ultra-widefield fluorescein angiography, spectral-domain optical coherence tomography, and optical coherence tomography angiography...
July 21, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28736672/handheld-optical-coherence-tomography-angiography
#14
Jianlong Yang, Liang Liu, J Peter Campbell, David Huang, Gangjun Liu
We developed a handheld optical coherence tomography angiography (OCTA) system using a 100-kHz swept-source laser. The handheld probe weighs 0.4 kg and measures 20.6 × 12.8 × 4.6 cm(3). The system has dedicated features for handheld operation. The probe is equipped with a mini iris camera for easy alignment. Real-time display of the en face OCT and cross-sectional OCT images in the system allows accurately locating the imaging target. Fast automatic focusing was achieved by an electrically tunable lens controlled by a golden-section search algorithm...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736665/airway-compliance-measured-by-anatomic-optical-coherence-tomography
#15
Ruofei Bu, Santosh Balakrishnan, Nicusor Iftimia, Hillel Price, Carlton Zdanski, Amy L Oldenburg
Quantification of airway compliance can aid in the diagnosis and treatment of obstructive airway disorders by detecting regions vulnerable to collapse. Here we evaluate the ability of a swept-source anatomic optical coherence tomography (SSaOCT) system to quantify airway cross-sectional compliance (CC) by measuring changes in the luminal cross-sectional area (CSA) under physiologically relevant pressures of 10-40 cmH2O. The accuracy and precision of CC measurements are determined using simulations of non-uniform rotation distortion (NURD) endemic to endoscopic scanning, and experiments performed in a simplified tube phantom and ex vivo porcine tracheas...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736663/three-dimensional-oct-based-guinea-pig-eye-model-relating-morphology-and-optics
#16
Pablo Pérez-Merino, Miriam Velasco-Ocana, Eduardo Martinez-Enriquez, Luis Revuelta, Sally A McFadden, Susana Marcos
Custom Spectral Optical Coherence Tomography (SOCT) provided with automatic quantification and distortion correction algorithms was used to measure the 3-D morphology in guinea pig eyes (n = 8, 30 days; n = 5, 40 days). Animals were measured awake in vivo under cyclopegia. Measurements showed low intraocular variability (<4% in corneal and anterior lens radii and <8% in the posterior lens radii, <1% interocular distances). The repeatability of the surface elevation was less than 2 µm. Surface astigmatism was the individual dominant term in all surfaces...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736656/noise-bias-and-polarization-artifact-corrected-optical-coherence-tomography-by-maximum-a-posteriori-intensity-estimation
#17
Aaron C Chan, Young-Joo Hong, Shuichi Makita, Masahiro Miura, Yoshiaki Yasuno
We propose using maximum a-posteriori (MAP) estimation to improve the image signal-to-noise ratio (SNR) in polarization diversity (PD) optical coherence tomography. PD-detection removes polarization artifacts, which are common when imaging highly birefringent tissue or when using a flexible fiber catheter. However, dividing the probe power to two polarization detection channels inevitably reduces the SNR. Applying MAP estimation to PD-OCT allows for the removal of polarization artifacts while maintaining and improving image SNR...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736652/statistical-properties-of-dynamic-speckles-from-flowing-brownian-scatterers-in-the-vicinity-of-the-image-plane-in-optical-coherence-tomography
#18
Ivan Popov, Andrew Weatherbee, I Alex Vitkin
A closed-form analytical expression is obtained for the spatio-temporal correlation function of the scattered radiation detected in fiber-based optical coherence tomography (OCT), assuming a clean optical system arrangement in the OCT sample arm. It is shown that the transverse flow component causes purely translational speckle motion with the predicted speckle velocity 2x higher than the velocity of the flowing particles as would be observed in the image plane under incoherent illumination. It is also shown that both speckle velocity and speckle radius do not depend on the position of the scattering volume relative to the focal plane, hence the derived correlation function is independent of the position of the scattering volume relative to the focal plane...
April 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/28736046/the-optical-imaging-of-tarantula-hair-corneal-injury-one-case-report-and-review-of-the-literature
#19
Yuedong Hu, Yuanyuan Xu
INTRODUCTION: Tarantulas belonging to the Theraphosidae family are more and more popular as family pets. Ocular injuries caused by tarantulas are reported in several articles. We hereby report the first known case of ocular injury caused by a tarantula in China. CASE: A 22-year-old girl was referred to our hospital with one-week history of red and irritated left eye after she grabbed her molting Chilean Rose Tarantula. Her best-corrected visual acuity was 20/20 on both eyes...
July 20, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28734913/uncovered-culprit-plaque-ruptures-in-patients-with-st-segment-elevation-myocardial-infarction-assessed-by-optical-coherence-tomography-and-intravascular-ultrasound-with-imap
#20
Mikkel Hougaard, Henrik Steen Hansen, Per Thayssen, Lisbeth Antonsen, Lisette Okkels Jensen
OBJECTIVES: This study assessed the incidence and course of healing of uncovered plaque ruptures (PR) following primary percutaneous coronary intervention. BACKGROUND: The infarct-related occlusion is frequently located at the lesion site with maximum thrombus burden, whereas the culprit PR may be situated more proximally or distally. METHODS: Uncovered PR in segments adjacent to the stent were identified by optical coherence tomography and intravascular ultrasound using iMap (Boston Scientific, Marlborough, Massachusetts) within 48 h and after 12 months...
July 13, 2017: JACC. Cardiovascular Imaging
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