نتایج جستجو برای: optical coherence tomography oct

تعداد نتایج: 482818  

2017
Tryfon Rotsos Konstantinos Andreanos Stelios Blounas Dimitrios Brouzas Dimitrios S. Ladas Ioannis D. Ladas

RATIONALE To investigate malignant hypertension ocular lesions with swept source optical coherence tomography (SS-OCT) and optical coherence tomography angiography (OCT-A). PATIENT CONCERNS Visual loss due to malignant hypertension. DIAGNOSES Hypertensive chorioretinopathy. INTERVENTIONS Patients were thoroughly examined on presentation and 30 days after their first visit, with swept-sour...

2012
Eduardo B. Rodrigues Margara Johanson Fernando M. Penha

Optical coherence tomography (OCT) is an optical acquisition method to examine biological tissues. In recent years, OCT has become an important imaging technology used in diagnosing and following macular pathologies. Further development enabled application of optical coherence tomography in evaluation of the integrity of the nerve fiber layer, optic nerve cupping, anterior chamber angle, or cor...

2010
B. I. Akca

Silicon oxynitride-based arrayed waveguide grating (AWG) spectrometers were designed for on-chip spectral-domain optical coherence tomography (OCT) systems and Raman spectroscopy of the skin. A novel geometrical layout for Raman spectroscopy was introduced to reduce loss. Measurements show that integrated optics has a good potential for miniaturizing current OCT systems. Keywords-arrayed wavegu...

Journal: :Optics letters 2004
Brian E Applegate Changhuei Yang Andrew M Rollins Joseph A Izatt

We describe a novel imaging technique, second-harmonic-generation optical coherence tomography (SHOCT). This technique combines the spatial resolution and depth penetration of optical coherence tomography (OCT) with the molecular sensitivity of second-harmonic-generation spectroscopy. As a consequence of the coherent detection required for OCT, polarization-resolved images arise naturally. We d...

2013
Harminder S Dua Arun D Singh

INFLUENCE OF CATARACT SURGERY ON MEASUREMENTS OF SPECTRAL DOMAIN OPTICAL COHERENCE TOMOGRAPHY Bambo et al evaluated the effect of uncomplicated cataract phacoemulsification on the measurements of macular and retinal nerve fibre layer (RNFL) using two spectral domain (SD) optical coherence tomography (OCT) instruments-Cirrus OCT (Zeiss) and Spectralis OCT (Heidelberg)-in 60 eyes healthy subjects...

2017
Blake M Hampton Christopher M Aderman Harry W Flynn Jayanth Sridhar

Purpose To report a case of bilateral choroidal neovascularization (CNV) in punctate inner choroidopathy (PIC) visualized utilizing optical coherence tomography angiography (OCT-A). Methods Case report. Results A 29-year-old woman presented with new visual symptoms in both eyes. Fundoscopic exam revealed bilateral multifocal, small, well-defined lesions consistent with PIC. Optical coherenc...

Journal: :medical hypothesis, discovery and innovation ophthalmology journal 0
sã­lvia mendes ophthalmology department - leiria hospital centre, portugal antã³nio campos ophthalmology department - leiria hospital centre, portugal joana campos ophthalmology department - leiria hospital centre, portugal arminda neves ophthalmology department - leiria hospital centre, portugal diana beselga ophthalmology department - leiria hospital centre, portugal cristina fernandes ophthalmology department - leiria hospital centre, portugal

this article reviews clinically relevant data regarding traumatic maculopathy (tm), frequently observed in clinical practice, especially due to sport or traffic accident injuries. it is characterized by transient gray-whitish retinal coloration and reduction of visual acuity (va) with closed, blunt object globe trauma of their prior. it may be limited to the posterior pole (berlin’s edema), o...

2017
Mahmut Kaya Taylan Ozturk Ziya Ayhan Nilufer Kocak Suleyman Kaynak

We report retinal structural changes of a 37-year-old man diagnosed with the concomitant occlusion of cilioretinal artery and central retinal vein. Comprehensive ophthalmological evaluation was performed, followed by spectral-domain optical coherence tomography (SD-OCT, Heidelberg), optical coherence tomography angiography (OCT angiography, Optovue Inc., Fremont, California, USA), fluorescein a...

Journal: :Chinese optics letters : COL 2013
Gangjun Liu Zhongping Chen

We review the principle and some recent applications of Doppler optical coherence tomography (OCT). The advances of the phase-resolved Doppler OCT method are described. Functional OCT algorithms which are based on an extension of the phase-resolved scheme are also introduced. Recent applications of Doppler OCT for quantification of flow, imaging of microvasculature and vocal fold vibration, and...

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