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optic coherent tomography

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https://www.readbyqxmd.com/read/29045946/subfoveal-choroidal-and-macular-thickness-changes-after-phacoemulsification-using-enhanced-depth-imaging-optical-coherence-tomography
#1
Huizhong Jiang, Zhen Li, Ran Sun, Dachuan Liu, Ningpu Liu
PURPOSE: To assess changes in the thickness of the subfoveal retina and choroid after phacoemulsification using enhanced depth imaging optical coherence tomography (EDI-OCT). METHODS: A prospective study was conducted on 100 patients. The subfoveal choroidal thickness (SFCT) was measured at 7 points and the retinal thickness was measured at 5 points (before surgery, and 1 day, 1 week, 1 month, and 3 months after surgery). RESULTS: The foveal choroidal thickness showed a thickening trend (but p > 0...
October 19, 2017: Ophthalmic Research
https://www.readbyqxmd.com/read/29045625/coronary-optical-coherence-tomography-derived-virtual-fractional-flow-reserve-ffr-anatomy-and-physiology-all-in-one
#2
Eric K W Poon, Vikas Thondapu, Eve Revalor, Andrew Ooi, Peter Barlis
No abstract text is available yet for this article.
October 17, 2017: European Heart Journal
https://www.readbyqxmd.com/read/29045333/relationship-between-optic-nerve-head-drusen-volume-and-structural-and-functional-optic-nerve-damage
#3
Alon Skaat, Stephanie Muylaert, Rachel S Mogil, Rafael L Furlanetto, Camila F Netto, Rudrani Banik, Jeffrey M Liebmann, Robert Ritch, Sung Chul Park
PURPOSE: To assess the relationships between optic nerve head drusen (ONHD) volume, retinal nerve fiber layer (RNFL) thickness and visual field (VF) loss. METHODS: Patients with ONHD and no other ocular or systemic conditions that can affect RNFL or VF were enrolled. Serial enhanced depth imaging (EDI) optical coherence tomography (OCT) B-scans of the optic nerve head (interval between scans, ~30 μm) were obtained from each participant. ONHD volume was calculated for each eye by delineating the ONHD masses in each OCT B-scan using 3-dimensional reconstruction software...
October 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/29045331/test-conditions-in-macular-visual-field-testing-in-glaucoma
#4
Mariko Eura, Chota Matsumoto, Shigeki Hashimoto, Sachiko Okuyama, Sonoko Takada, Hiroki Nomoto, Fumi Tanabe, Yoshikazu Shimomura
PURPOSE: To evaluate the suitable visual field (VF) test conditions (target size, test type, and eccentricity) for the macular region, we investigated the correlations between the ganglion cell layer (GCL) thickness and six VF test results. METHODS: We tested 32 eyes of patients (61.1±9.2 y) with preperimetric (6), early-stage (16), and moderate-stage (10) glaucoma. The VF tests included 3 SAP (the 10-2 HFA using SITA with target size III [HFA SITA (III)], full threshold with size III [HFA FULL (III)] and size I [HFA FULL (I)]) and 3 visual function-specific perimetry tests (the 10-2 SWAP, 10-2 flicker, and 10-2 Humphrey Matrix)...
October 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/29045329/hybrid-deep-learning-on-single-wide-field-optical-coherence-tomography-scans-accurately-classifies-glaucoma-suspects
#5
Hassan Muhammad, Thomas J Fuchs, Nicole De Cuir, Carlos G De Moraes, Dana M Blumberg, Jeffrey M Liebmann, Robert Ritch, Donald C Hood
PURPOSE: Existing summary statistics based upon optical coherence tomographic (OCT) scans and/or visual fields (VFs) are suboptimal for distinguishing between healthy and glaucomatous eyes in the clinic. This study evaluates the extent to which a hybrid deep learning method (HDLM), combined with a single wide-field OCT protocol, can distinguish eyes previously classified as either healthy suspects or mild glaucoma. METHODS: In total, 102 eyes from 102 patients, with or suspected open-angle glaucoma, had previously been classified by 2 glaucoma experts as either glaucomatous (57 eyes) or healthy/suspects (45 eyes)...
October 17, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/29045269/choroideremia-associated-with-a-novel-synonymous-mutation-in-gene-encoding-rep-1
#6
Jesse D Sengillo, Winston Lee, Mathieu F Bakhoum, Galaxy Y Cho, John P-W Chiang, Stephen H Tsang
PURPOSE: To report a novel synonymous mutation in CHM and the associated phenotype in an affected man and carrier mother. METHODS: Case report. RESULTS: A 34-year-old man with a long history of progressive night blindness and visual field constriction was diagnosed with choroideremia based on ocular examination and multimodal retinal imaging. Extensive chorioretinal degeneration was noted on spectral domain optical coherence tomography and fundus autofluorescence imaging...
October 17, 2017: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/29044926/optical-coherence-tomography-guided-carotid-artery-stent-procedure-technique-and-potential-applications
#7
Suhail Dohad, Alexander Zhu, Sandeep Krishnan, Frances Wang, Serena Wang, Justin Cox, Timothy D Henry
OBJECTIVES: To (1) present a guide on how to perform optical coherence tomography (OCT) in carotid artery stenting (CAS), to (2) highlight several instructive cases illustrating OCT-guidance as an interventional strategy, and to (3) present the largest case-series of OCT-guided CAS performed in North America, demonstrating its feasibility as an imaging modality in this setting. BACKGROUND: OCT is an intravascular imaging method that captures images with an axial resolution 10 times higher than intravascular ultrasound...
October 16, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/29044537/in-vivo-imaging-of-the-internal-nasal-valve-during-different-conditions-using-optical-coherence-tomography
#8
Anna S Englhard, Maximilian Wiedmann, Georg J Ledderose, Bryan Lemieux, Alan Badran, Joseph C Jing, Zhongping Chen, Veronika Volgger, Brian J F Wong
OBJECTIVE: Previously, we proposed long-range optical coherence tomography (LR-OCT) to be an effective method for the quantitative evaluation of the nasal valve geometry. Here, the objective was to quantify the reduction in the internal nasal valve angle and cross-sectional area that results in subjective nasal airway obstruction and to evaluate the dynamic behavior of the valve during respiration using LR-OCT. METHODS: For 16 healthy individuals, LR-OCT was performed in each naris during: 1) normal respiration, 2) peak forced inspiration, 3) lateral nasal wall depression (to the onset of obstructive symptoms), and 4) after application of a topical decongestant...
October 17, 2017: Laryngoscope
https://www.readbyqxmd.com/read/29044086/optical-coherence-tomography-angiography-of-circumscribed-choroidal-hemangioma-treated-with-photodynamic-therapy
#9
Giuseppe Lo Giudice, Alessandro Galan
We describe features of a circumscribed choroidal hemangioma (CCH) treated with photodynamic therapy (PDT) by means of optical coherence tomography angiography (OCT-A). A 40-year-old man had a complaint of decreasing visual acuity in his left eye for 10 days. A diagnosis of CCH was confirmed by fundus examination, fluorescein angiography, and indocyanine green angiography. An OCT-A study of choroidal lesion before and after PDT was carried out. Segmented en face OCT-A of CCH showed multiple irregular connected vascular channels with hyperflow and a capillary-like lesion...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29044078/primary-calcareous-degeneration-of-the-cornea
#10
Gustavo Longhi Bordin, Fabio Dornelles, Juliana Amaral Martins, Otavio Azevedo Magalhaes
Primary calcareous degeneration is a rare corneal disease. In the past 50 years, only four cases have been described. We present the case of a 26-year-old male patient with progressive calcium deposition in both eyes with negative laboratory parameters. For the first time, anterior segment optic coherence tomography was used to investigate and establish the proper treatment.
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29044076/vitreous-opacities-causing-artifacts-in-optical-coherence-tomography-angiography
#11
Vinaya Kumar Konana, P Mahesh Shanmugam, Rajesh Ramanjulu, K C Divyansh Mishra
No abstract text is available yet for this article.
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29044073/type-2-big-bubble-deep-anterior-lamellar-keratoplasty-serial-anterior-segment-optical-coherence-tomography-documentation-showing-resolution-of-bubble-in-the-postoperative-period
#12
https://www.readbyqxmd.com/read/29044067/improvement-in-distance-and-near-visual-acuities-using-low-vision-devices-in-diabetic-retinopathy
#13
Sarika Gopalakrishnan, Aishwarya Muralidharan, Shwetha Chambayil Susheel, Rajiv Raman
PURPOSE: The aim of this study is to elucidate the causes and level of visual impairment (VI) in patients with different pathologies of diabetic retinopathy (DR) who presented to a low vision care (LVC) clinic, to analyze the type of distant and near devices prescribed to them and the visual benefits thereof. METHODS: A retrospective chart review was done for 100 consecutive patients with DR who were referred to the LVC clinic from June 2015 to June 2016. The reason for referral was assessed from the electronic medical records and available fundus photographs, fundus fluorescein angiograms, and optical coherence tomography images by a retina specialist...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29044060/interocular-symmetry-of-retinal-nerve-fiber-layer-and-optic-nerve-head-parameters-measured-by-cirrus-high-definition-optical-coherence-tomography-in-a-normal-pediatric-population
#14
Neelam Pawar, Devendra Maheshwari, Meenakshi Ravindran, Renagappa Ramakrishnan
PURPOSE: To determine interocular differences in the retinal nerve fiber layer (RNFL) and optic nerve head (ONH) parameters in a pediatric population using Cirrus high-definition optical coherence tomography (HD-OCT). METHODS: Seventy normal Indian children aged 5-17 years presenting to the Pediatric Clinic were included in this observational cross-sectional study. All subjects underwent a comprehensive ophthalmologic examination and an evaluation of the RNFL and ONH by Cirrus HD-OCT...
October 2017: Indian Journal of Ophthalmology
https://www.readbyqxmd.com/read/29043715/quantitative-light-induced-fluorescence-technology-for-quantitative-evaluation-of-tooth-wear
#15
Sang-Kyeom Kim, Hyung-Suk Lee, Seok-Woo Park, Eun-Song Lee, Elbert de Josselin de Jong, Hoi-In Jung, Baek-Il Kim
Various technologies used to objectively determine enamel thickness or dentin exposure have been suggested. However, most methods have clinical limitations. This study was conducted to confirm the potential of quantitative light-induced fluorescence (QLF) using autofluorescence intensity of occlusal surfaces of worn teeth according to enamel grinding depth in vitro. Sixteen permanent premolars were used. Each tooth was gradationally ground down at the occlusal surface in the apical direction. QLF-digital and swept-source optical coherence tomography images were acquired at each grinding depth (in steps of 100  μm)...
October 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29043714/spectroscopic-doppler-analysis-for-visible-light-optical-coherence-tomography
#16
Xiao Shu, Wenzhong Liu, Lian Duan, Hao F Zhang
Retinal oxygen metabolic rate can be effectively measured by visible-light optical coherence tomography (vis-OCT), which simultaneously quantifies oxygen saturation and blood flow rate in retinal vessels through spectroscopic analysis and Doppler measurement, respectively. Doppler OCT relates phase variation between sequential A-lines to the axial flow velocity of the scattering medium. The detectable phase shift is between -π and π due to its periodicity, which limits the maximum measurable unambiguous velocity without phase unwrapping...
October 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29043565/eccentric-macular-hole-after-pars-plana-vitrectomy-for-epiretinal-membrane-without-internal-limiting-membrane-peeling-a-case-report
#17
Christina Garnavou-Xirou, Tina Xirou, Stamatina Kabanarou, Ilias Gkizis, Stavros Velissaris, Irini Chatziralli
INTRODUCTION: Postoperative eccentric macular hole formation is an uncommon complication after pars plana vitrectomy (PPV) without internal limiting membrane (ILM) peeling for the treatment of epiretinal membrane (ERM). We present a case of eccentric macular hole formation after PPV for ERM without ILM peeling. CASE REPORT: A 68-year-old male patient presented with ERM and visual acuity of 6/24 in his left eye. He underwent 23-gauge PPV without ILM peeling for treatment of ERM...
October 17, 2017: Ophthalmology and Therapy
https://www.readbyqxmd.com/read/29041865/imaging-outcome-measures-for-progressive-multiple-sclerosis-trials
#18
Marcello Moccia, Nicola de Stefano, Frederik Barkhof
Imaging markers that are reliable, reproducible and sensitive to neurodegenerative changes in progressive multiple sclerosis (MS) can enhance the development of new medications with a neuroprotective mode-of-action. Accordingly, in recent years, a considerable number of imaging biomarkers have been included in phase 2 and 3 clinical trials in primary and secondary progressive MS. Brain lesion count and volume are markers of inflammation and demyelination and are important outcomes even in progressive MS trials...
October 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29041705/depth-resolved-local-reflectance-spectra-measurements-in-full-field-optical-coherence-tomography
#19
Rémy Claveau, Paul Montgomery, Manuel Flury, Denis Montaner
Full-field optical coherence tomography (FF-OCT) is a widely used technique for applications such as biological imaging, optical metrology, and materials characterization, providing structural and spectral information. By spectral analysis of the backscattered light, the technique of spectroscopic-OCT enables the differentiation of structures having different spectral properties, but not the determination of their reflectance spectrum. For surface measurements, this can be achieved by applying a Fourier transform to the interferometric signals and using an accurate calibration of the optical system...
August 21, 2017: Optics Express
https://www.readbyqxmd.com/read/29041312/automatic-spectral-calibration-for-polarization-sensitive-optical-coherence-tomography
#20
Yan Chen, Zhongliang Li, Nan Nan, Yang Bu, Xuan Wang, Liuhua Pan, Xiangzhao Wang
Accurate wavelength assignment is important for Fourier domain polarization-sensitive optical coherence tomography. Incorrect wavelength mapping between the orthogonal horizontal (H) and vertical (V) polarization channels leads to broadening the axial point spread function and generating polarization artifacts. To solve the problem, we propose an automatic spectral calibration method by seeking the optimal calibration coefficient between wavenumber kH and kV. The method first performs a rough calibration to get the relationship between the wavelength λ and the pixel number x of the CCD for each channel...
October 2, 2017: Optics Express
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