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optical coherence tomograph

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https://www.readbyqxmd.com/read/29332249/correlation-of-flow-density-as-measured-using-optical-coherence-tomography-angiography-with-structural-and-functional-parameters-in-glaucoma-patients
#1
Maged Alnawaiseh, Larissa Lahme, Viktoria Müller, André Rosentreter, Nicole Eter
PURPOSE: To evaluate the correlation between flow density, as measured by optical coherence tomography angiography (OCTA), and structural and functional parameters in patients with open-angle glaucoma. METHODS: Thirty-four eyes of 34 patients with open-angle glaucoma and 35 eyes of 35 healthy subjects were prospectively included in this study. OCTA was performed using RTVue XR Avanti with AngioVue. The macula was imaged with a 3 × 3 mm scan and the optic nerve head (ONH) with a 4...
January 13, 2018: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29327060/optical-coherence-tomography-analysis-of-the-optic-nerve-head-and-surrounding-structures-in-long-duration-international-space-station-astronauts
#2
Nimesh Patel, Anastas Pass, Sara Mason, Charles R Gibson, Christian Otto
Importance: After long-duration spaceflight, morphological changes in the optic nerve head (ONH) and surrounding tissues have been reported. Objective: To develop methods to quantify ONH and surrounding tissue changes using preflight and postflight optical coherence tomographic scans of the ONH region. Design, Setting, and Participants: Two separate analyses were done on retrospective data, with the first comparing a preflight group with a control group, followed by preflight to postflight analysis...
January 11, 2018: JAMA Ophthalmology
https://www.readbyqxmd.com/read/29327046/ocular-coherence-tomographic-analysis-of-the-optic-nerve-head-and-surrounding-structures-in-space-flight-associated-neuro-ocular-syndrome
#3
Andrew G Lee
No abstract text is available yet for this article.
January 11, 2018: JAMA Ophthalmology
https://www.readbyqxmd.com/read/29297620/development-of-full-field-optical-spatial-coherence-tomography-system-for-automated-identification-of-malaria-using-the-multilevel-ensemble-classifier
#4
Neeru Singla, Vishal Srivastava, Dalip Singh Mehta
Malaria is a life-threatening infectious blood disease affecting humans and other animals caused by parasitic protozoans belonging to the Plasmodium type especially in developing countries. The gold standard method for the detection of malaria is through the microscopic method of chemically treated blood smears. We developed an automated optical spatial coherence tomographic system using a machine learning approach for a fast identification of malaria cells. In this study, 28 samples (15 healthy, 13 malaria infected stages of red blood cells) were imaged by the developed system and 13 features were extracted...
January 3, 2018: Journal of Biophotonics
https://www.readbyqxmd.com/read/29296500/gabor-optical-coherence-tomographic-angiography-gocta-part-i-human-retinal-imaging-in-vivo
#5
Chaoliang Chen, Victor X D Yang
Recently, parallel high A-line speed and wide field imaging for optical coherence tomography angiography (OCTA) has become more prevalent, resulting in a dramatic increase of data quantity which poses a challenge for real time imaging even for GPU in data processing. In this manuscript, we propose a new OCTA processing technique, Gabor optical coherence tomographic angiography (GOCTA), for label-free human retinal angiography imaging. In spectral domain optical coherence tomography (SDOCT), k-space resampling and Fourier transform (FFT) are required for the entire data set of interference fringes to calculate blood flow information in previous OCTA algorithms, which are computationally intensive...
December 1, 2017: Biomedical Optics Express
https://www.readbyqxmd.com/read/29276441/bioresorbable-scaffolds-in-spontaneous-coronary-artery-dissection-long-term-follow-up-in-4-patients
#6
Santiago Jesús Camacho Freire, Antonio Enrique Gómez Menchero, Jessica Roa Garrido, Javier León Jiménez, Rosa Cardenal Piris, José Francisco Díaz Fernández
Spontaneous coronary artery dissection is a rare condition, and diagnosis and treatment are challenging among patients who present with acute coronary syndrome. Typically, the condition affects young females who have no underlying atherosclerotic disease. To date, few cases of bioresorbable scaffold implantation for the treatment of spontaneous coronary artery dissection have been reported. Therefore, we describe the cases of 4 patients whom we treated with scaffolds. We evaluated the long-term results by using intravascular ultrasound and optical coherence tomographic scanning...
December 2017: Texas Heart Institute Journal
https://www.readbyqxmd.com/read/29260116/swept-source-optical-coherence-tomographic-findings-in-eyes-with-metastatic-choroidal-tumor
#7
Tomoka Ishida, Kei Morohoshi, Yayoi Takeuchi, Ryoko Soma, Minami Uchida, Kyoko Ohno-Matsui
Purpose: To report the swept-source optical coherence tomographic (OCT) findings in two eyes with choroidal metastases. Observations: Two patients with choroidal metastasis were studied. The metastasis was from a breast cancer in Case 1 and from a lung cancer in Case 2. In Case 1, swept-source OCT showed a highly reflective solid tumor with low optical reflective tissues that had replaced the choroidal tissue. Swept-source OCT was able to image the choroidal mass where other fundus imaging methods such as fluorescein angiography did not show the mass...
December 2017: American Journal of Ophthalmology Case Reports
https://www.readbyqxmd.com/read/29232337/retinal-telangiectasia-in-patients-with-pathologic-myopia-a-case-series
#8
Boya Lei, Ruiping Gu, Chen Jiang, Gezhi Xu
PURPOSE: To describe the characteristics of retinal telangiectasia in eyes with pathologic myopia. METHODS: The study included 10 patients (18 eyes) who were diagnosed with pathologic myopia combined with retinal telangiectasia. The patients visited our retinal clinic every 3 months. Nine eyes underwent vitrectomy for vision-threatening complications after diagnosis. All eyes underwent comprehensive ophthalmologic examinations including multimodal retinal imaging at presentation and at each follow-up...
December 8, 2017: Retina
https://www.readbyqxmd.com/read/29215533/surgical-removal-of-epiretinal-membrane-with-and-without-removal-of-internal-limiting-membrane-comparative-study-of-visual-acuity-features-of-optical-coherence-tomography-and-recurrence-rate
#9
Fernando J De Novelli, Mauro Goldbaum, Mario L R Monteiro, Fabio Bom Aggio, Walter Y Takahashi
PURPOSE: To study and compare visual acuity, foveal thickness, outer limiting layer, ellipsoid zone, and recurrence rate in patients undergoing removal of the epiretinal membrane with and without the removal of the internal limiting membrane (ILM). METHODS: Sixty-three patients who had the epiretinal membrane removed by a single surgeon were randomly assigned into 2 groups: Group 1 without additional removal of the ILM and Group 2 with removal of the ILM. Patients were followed up and evaluated at the first month, third month, and sixth month, postoperatively...
December 5, 2017: Retina
https://www.readbyqxmd.com/read/29197157/application-of-the-isnt-rules-on-retinal-nerve-fibre-layer-thickness-and-neuroretinal-rim-area-in-healthy-myopic-eyes
#10
Kunliang Qiu, Geng Wang, Xuehui Lu, Riping Zhang, Lixia Sun, Mingzhi Zhang
PURPOSE: We determined the applicability of inferior > superior > nasal > temporal (ISNT) rules on retinal nerve fibre layer (RNFL) thickness and rim area and evaluated the impact of various ocular factors on the performance of the ISNT rules in healthy myopic eyes. METHODS: A total of 138 eyes from 138 healthy myopic subjects were included in this cross-sectional observational study. The peripapillary RNFL and optic disc in each eye were imaged with Cirrus HD optical coherence tomography (OCT) and Heidelberg Retina Tomograph II (HRT2), respectively...
December 2, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/29171207/formation-and-transformation-of-neointima-after-drug-eluting-stent-implantation-insights-from-optical-coherence-tomographic-studies
#11
REVIEW
Seung Yul Lee, Myeong Ki Hong, Yangsoo Jang
After coronary stent implantation, neointima formation resembles the wound healing process as it involves the sequential processes of inflammation, granulation, and remodeling. Because antiproliferative drugs and polymers of drug-eluting stents (DESs) delay vascular healing compared with bare metal stents, fibrin deposition can remain long after stent implantation, or inflammation can be excessive. Delayed vascular healing can be associated with adverse clinical outcomes including DES thrombosis or restenosis, and poor endothelization of DES neointima can accelerate neoatherosclerotic change inside the neointima, further contributing to luminal restenosis or neointimal instability...
November 2017: Korean Circulation Journal
https://www.readbyqxmd.com/read/29147767/mechanism-of-accommodation-assessed-by-change-in-precisely-registered-ocular-images-associated-with-concurrent-change-in-auto-refraction
#12
Andrzej Grzybowski, Ronald A Schachar, Magdalena Gaca-Wysocka, Ira H Schachar, Farhad Kamangar, Barbara K Pierscionek
PURPOSE: Our purpose was to determine the changes in anterior chamber depth (ACD) and central lens thickness (CLT) during pharmacologically induced accommodation. METHODS: Following pupillary dilation with phenylephrine 10%, baseline auto-refractions and swept-source optical coherence tomographic biometric images (Zeiss IOLMaster 700) were obtained from the right eyes of 25 subjects aged 19 to 24 years. Pilocarpine 4% and phenylephrine 10% were then instilled into these right eyes...
November 16, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/29135076/a-heterozygous-mutation-in-rpgr-associated-with-x-linked-retinitis-pigmentosa-in-a-patient-with-turner-syndrome-mosaicism-45-x-46-xx
#13
Qi Zhou, Fengxia Yao, Feng Wang, Hui Li, Rui Chen, Ruifang Sui
Turner syndrome with retinitis pigmentosa (RP) is rare, with only three cases reported based on clinical examination alone. We summarized the 4-year follow-up and molecular findings in a 28-year-old patient with Turner syndrome and the typical features of short stature and neck webbing, who also had X-linked RP. Her main complaints were night blindness and progressive loss of vision since the age of 9 years. Ophthalmologic examination, optical coherent tomographic imaging, and visual electrophysiology tests showed classic manifestations of RP...
November 14, 2017: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29125012/optical-assessment-of-the-in-vivo-tympanic-membrane-status-using-a-handheld-optical-coherence-tomography-based-otoscope
#14
Kibeom Park, Nam Hyun Cho, Mansik Jeon, Sang Heun Lee, Jeong Hun Jang, Stephen A Boppart, Woonggyu Jung, Jeehyun Kim
OBJECTIVE: Conventional otoscopes and oto-endoscopes, which are used to examine the tympanic membrane (TM), do not provide tomographic information. Optical coherence tomography (OCT) non-invasively reveals the depth-resolved internal microstructure of the TM with very high spatial resolution. We designed this study to examine the TMs with middle ear diseases using a handheld otoscope employing 860 nm spectral domain (SD)-OCT, combined with video camera and to demonstrate the clinical applicability of this system...
November 10, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29122823/comparative-evaluation-of-progression-rate-in-keratoconus-before-and-after-collagen-crosslinking
#15
Yu Meng Wang, Tommy Cy Chan, Marco C Y Yu, Vishal Jhanji
PURPOSE: To compare the rate of disease progression in keratoconus before and after corneal collagen crosslinking (CXL). METHODS: 145 eyes were followed without CXL (no-CXL group) for a median duration of 31 months whereas 45 eyes were followed up for 41 months before (pre-CXL) and after (post-CXL) accelerated, epithelium-off crosslinking. Progression was defined based on significant slope found in linear mixed effect models against time. Swept-source optical coherence tomography was used for measurement of anterior steep keratometry, anterior flat keratometry (Ant Kf), anterior average keratometry (Ant Avg K); posterior steep keratometry, posteriorflat keratometry (Post Kf), posterior average keratometry (Post Avg K) and corneal thickness...
November 9, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29122818/optical-coherence-tomographic-angiography-identifies-peripapillary-microvascular-dilation-and-focal-non-perfusion-in-giant-cell-arteritis
#16
Eric D Gaier, Aubrey L Gilbert, Dean M Cestari, John B Miller
AIMS: We set out to determine the optical coherence tomographic angiography (OCT-A) characteristics of arteritic anterior ischaemic optic neuropathy (AAION) in the context of giant cell arteritis (GCA). METHODS: This is an observational case series of four patients with AAION secondary to GCA, three with unilateral AAION and one with bilateral AAION. We reviewed the charts, fundus photography, visual fields, fluorescein angiography (FA) and OCT-A images for all patients to identify a unifying theme in a range of AAION clinical severity...
November 9, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/29118506/localized-retinal-degeneration-secondary-to-waldenstr%C3%A3-m-s-macroglobulinemia
#17
Dhanashree Ratra, Vineet Ratra, Mansi Kishnani
A 52-year-old man, treated for Waldenström's macroglobulinemia (WM), continued to experience decreased vision even after 24 months. He was evaluated using multimodal imaging and electroretinography. The retina did not show any hyperviscosity changes but revealed a yellow lesion at macula with atrophic changes causing a pattern on fluorescein angiography similar to a leopard's skin. Optical coherence tomographic imaging revealed uniformly reflective material deposited in the outer retina with degeneration of outer retinal layers...
September 2017: Oman Journal of Ophthalmology
https://www.readbyqxmd.com/read/29104179/safety-of-6-month-dual-antiplatelet-therapy-after-second-generation-drug-eluting-stent-implantation-optima-c-randomized-clinical-trial-and-oct-substudy
#18
Byoung-Kwon Lee, Jung-Sun Kim, Oh-Huyn Lee, Pil-Ki Min, Young-Won Yoon, Bum-Kee Hong, Dong-Ho Shin, Tae-Soo Kang, Byung Ok Kim, Duk-Kyu Cho, Dong Woon Jeon, Sung-Ill Woo, Seonghoon Choi, Byung-Ryul Cho, Woong-Chol Kang, Seunghwan Kim, Byeong-Keuk Kim, Myeong-Ki Hong, Yangsoo Jang, Hyuck Moon Kwon
AIMS: There are few randomized studies of the optimal duration of dual antiplatelet therapy (DAPT) for patients who receive a second-generation drug-eluting stent (DES). METHODS AND RESULTS: A prospective, randomized, multicenter trial was performed at 10 medical centers. The 1,368 patients included in the study received a biolimus-eluting stent (BES) or zotarolimus-eluting stent (ZES). The primary outcome measured was the composite of major adverse cardiac events (MACEs), including cardiac death, myocardial infarction (MI), or ischemia-driven target lesion revascularization at the 12-month follow-up...
November 7, 2017: EuroIntervention
https://www.readbyqxmd.com/read/29065642/the-use-of-optical-coherence-tomography-in-dental-diagnostics-a-state-of-the-art-review
#19
REVIEW
Monika Machoy, Julia Seeliger, Liliana Szyszka-Sommerfeld, Robert Koprowski, Tomasz Gedrange, Krzysztof Woźniak
Optical coherence tomography provides sections of tissues in a noncontact and noninvasive manner. The device measures the time delay and intensity of the light scattered or reflected from biological tissues, which results in tomographic imaging of their internal structure. This is achieved by scanning tissues at a resolution ranging from 1 to 15 μm. OCT enables real-time in situ imaging of tissues without the need for biopsy, histological procedures, or the use of X-rays, so it can be used in many fields of medicine...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29065014/inverted-internal-limiting-membrane-flap-technique-for-treatment-of-macular-hole-retinal-detachment-in-highly-myopic-eyes
#20
Hiroyuki Takahashi, Makoto Inoue, Takashi Koto, Yuji Itoh, Kazunari Hirota, Akito Hirakata
PURPOSE: To compare the efficacy of vitrectomy with inverted internal limiting membrane (ILM) flap to complete removal of the ILM for the treatment of macular hole (MH) retinal detachment in highly myopic eyes. METHODS: Pars plana vitrectomy with inverted ILM flap technique (16 eyes; inverted group) or with the complete removal of the ILM (16 eyes; removed group) was performed in patients with high myopia with MH retinal detachment. The rate of retinal reattachment and MH closure, the best-corrected visual acuities, and the integrity of the foveal microstructures in the optical coherence tomographic images were compared...
October 23, 2017: Retina
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