نتایج جستجو برای: optical coherence tomography

تعداد نتایج: 473637  

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...

2018
Lian Duan Xi Qin Yuanhao He Xialin Sang Jinda Pan Tao Xu Jing Men Rudolph E. Tanzi Airong Li Yutao Ma Chao Zhou

Convolutional neural networks are powerful tools for image segmentation and classification. Here, we use this method to identify and mark the heart region of Drosophila at different developmental stages in the cross-sectional images acquired by a custom optical coherence microscopy (OCM) system. With our well-trained convolutional neural network model, the heart regions through multiple heartbe...

Journal: :Clinical otolaryngology : official journal of ENT-UK ; official journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery 2009
M L Kaiser M Rubinstein D E Vokes J M Ridgway S Guo M Gu R L Crumley W B Armstrong Z Chen B J F Wong

OBJECTIVES Optical coherence tomography, an imaging modality using near-infrared light, produces cross-sectional tissue images with a lateral pixel resolution of 10 microm. However, normative data is first needed on epithelial thickness for lesion characterisation, and, to date, little exists. The purpose of our study is to measure normal laryngeal epithelial thickness by in vivo optical cohere...

2017
Eunjoo Choi Masato Ohmi Takayuki Komatsu Shogo Yagi Kazuo Fujiura

We have developed optical coherence tomography system with KTN optical probe for a diagnosis in the orthopedic surgery fields. The present system demonstrates that biological image was measured by using KTN optical scanner for having degree of freedom in sample arm as optical coherence tomography. In addition, the developed optical coherence tomography (OCT) system has shown feasibility for ima...

Journal: :journal of medical signals and sensors 0
mahdad esmaeili alireza mehri dehnavi hossein rabbani fedra hajizadeh

this paper presents a new three-dimensional curvelet transform based dictionary learning for automatic segmentation of intraretinalcysts, most relevant prognostic biomarker in neovascular age-related macular degeneration, from 3d spectral-domain optical coherencetomography (sd-oct) images. in particular, we focus on the spectralis sd-oct (heidelberg engineering, heidelberg, germany) system, and...

Journal: :Arquivos brasileiros de oftalmologia 2010
Antonio Marcelo Barbante Casella Michel Eid Farah Eduardo Cunha de Souza Rubens Belfort Ana Paula Miyagusko Taba Oguido

PURPOSE To report the findings of optical coherence tomography (OCT) in three cases of diffuse unilateral subacute neuroretinitis (DUSN). METHODS Three young patients with confirmed diagnosis of diffuse unilateral subacute neuroretinitis were followed-up using Stratus OCT. RESULTS Optical coherence tomography findings included retinal nerve fiber layer atrophy and focal edema where the worm...

2003
Brian R. White Mark C. Pierce Nader Nassif Barry Cense B. Hyle Park Guillermo J. Tearney Brett E. Bouma Teresa C. Chen Johannes F. de Boer Y. H. Zhao Z. P. Chen C. Saxer Q. M. Shen S. H. Xiang A. M. Rollins S. Yazdanfar J. K. Barton J. A. Izatt

An ultra-high-speed spectral domain optical Doppler tomography (SD-ODT) system is used to acquire images of blood flow in a human retina in vivo, at 29,000 depth profiles (A-lines) per second and with data acquisition over 99% of the measurement time. The phase stability of the system is examined and image processing algorithms are presented that allow accurate determination of bi-directional D...

Akbarzadeh, Siamak , Bazzazi, Nooshin , Sobhan, Mohammadreza ,

Background and Objective: One of the most common extracutaneous complications in psoriasis patients is ocular complications, which is controversial concerning its effect on choroidal thickness. This study aimed to compare the psoriasis patients with healthy individuals in terms of the thickness of the choroidal layer using the optical coherence tomography technique. Materials and Methods: In t...

2016
Simon S. Gao Yali Jia Miao Zhang Johnny P. Su Gangjun Liu Thomas S. Hwang Steven T. Bailey David Huang

Optical coherence tomography angiography (OCTA) is a noninvasive approach that can visualize blood vessels down to the capillary level. With the advent of high-speed OCT and efficient algorithms, practical OCTA of ocular circulation is now available to ophthalmologists. Clinical investigations that used OCTA have increased exponentially in the past few years. This review will cover the history ...

2008
Wolfgang Drexler James G. Fujimoto

ince intravascular ultrasound (IVUS) was introduced in the early 1990 s,1,2 it has been used not only as an adjunctive device to percutaneous coronary interventions (PCI), but also as a research tool to evaluate vessel structure in detail. Although IVUS has helped broaden our understanding of coronary artery structure, its limited spatial resolution does not allow for the assessment of microstr...

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