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Optical coherence tomography

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https://www.readbyqxmd.com/read/28732095/automated-framework-for-intraretinal-cystoid-macular-edema-segmentation-in-three-dimensional-optical-coherence-tomography-images-with-macular-hole
#1
Weifang Zhu, Li Zhang, Fei Shi, Dehui Xiang, Lirong Wang, Jingyun Guo, Xiaoling Yang, Haoyu Chen, Xinjian Chen
No abstract text is available yet for this article.
July 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28732047/in-vivo-analysis-of-glaucoma-related-features-within-the-optic-nerve-head-using-enhanced-depth-imaging-optical-coherence-tomography
#2
Tiago S Prata, Flavio S Lopes, Vitor G Prado, Izabela Almeida, Igor Matsubara, Syril Dorairaj, Rafael L Furlanetto, Roberto M Vessani, Augusto Paranhos
Structural differences between optic nerve head (ONH) parameters in glaucomatous and non-glaucomatous eyes has been documented, however the association between such parameters in patients with different disease stages is yet to be elucidated. We investigated the relationship between different laminar and prelaminar ONH structures using enhanced depth imaging spectral-domain optical coherence tomography (EDI OCT) in a population with and without glaucoma. In this observational case-control study, we prospectively enrolled healthy individuals and glaucomatous patients with different disease stages...
2017: PloS One
https://www.readbyqxmd.com/read/28731763/measurement-induced-strong-kerr-nonlinearity-for-weak-quantum-states-of-light
#3
Luca S Costanzo, Antonio S Coelho, Nicola Biagi, Jaromír Fiurášek, Marco Bellini, Alessandro Zavatta
Strong nonlinearity at the single photon level represents a crucial enabling tool for optical quantum technologies. Here we report on experimental implementation of a strong Kerr nonlinearity by measurement-induced quantum operations on weak quantum states of light. Our scheme coherently combines two sequences of single photon addition and subtraction to induce a nonlinear phase shift at the single photon level. We probe the induced nonlinearity with weak coherent states and characterize the output non-Gaussian states with quantum state tomography...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28731059/optical-coherence-tomography-detection-of-characteristic-retinal-nerve-fiber-layer-thinning-in-nasal-hypoplasia-of-the-optic-disc
#4
M Haruta, R Kodama, R Yamakawa
PurposeTo determine the clinical usefulness of optical coherence tomography (OCT) for detecting thinning of the retinal nerve fiber layer (RNFL) in eyes with nasal hypoplasia of the optic discs (NHOD).Patients and methodsThe medical records of five patients (eight eyes) with NHOD were reviewed. The ratio of the disc-macula distance to the disc diameter (DM/DD) and the disc ovality ratio of the minimal to maximal DD were assessed using fundus photographs. The RNFL thicknesses of the temporal, superior, nasal, and inferior quadrants were evaluated using OCT quadrant maps...
July 21, 2017: Eye
https://www.readbyqxmd.com/read/28731057/idiopathic-macular-holes-and-direction-of-vitreomacular-traction-structural-changes-and-surgical-outcomes
#5
C-Y Tsai, Y-T Hsieh, T-T Lai, C-M Yang
PurposeTo compare the structural changes, clinical course, and treatment outcomes of vertical and horizontal vitreomacular traction (VMT) induced impending macular holes (IMHs) and full-thickness macular holes (FTMHs).MethodsIn this retrospective study, 23 and 32 cases of IMHs and FTMHs, respectively, were analyzed. The IMH cases were divided into two subgroups: IMH with and without foveal detachment. Vitreofoveal traction angles (TAs) between the inner retinal surface and posterior hyaloid were measured from horizontal and vertical optical coherence tomography (OCT) images by using the trigonometric function (the angle equals the arctangent of the height over the base) after adjustments for magnification factors...
July 21, 2017: Eye
https://www.readbyqxmd.com/read/28731055/choroidal-excavation-in-choroidal-osteoma-complicated-by-choroidal-neovascularization
#6
L Pierro, A Marchese, M Gagliardi, U Introini, M Battaglia Parodi, G Casalino, F Bandello
PurposeTo describe multimodal imaging features of choroidal osteoma (CO) complicated by choroidal neovascularization (CNV) and focal choroidal excavation (FCE).MethodsPatients presenting with CO and CNV between January and October 2016 were considered for this study. Diagnosis of CO was confirmed by ultrasound examination. All patients underwent multimodal imaging including optical coherence tomography (OCT), swept-source OCT angiography (DRI OCT Triton, Topcon, Inc., Tokyo, Japan) and fluorescein angiography (Spectralis HRA+OCT; Heidelberg Engineering, Heidelberg, Germany)...
July 21, 2017: Eye
https://www.readbyqxmd.com/read/28730400/evaluation-of-retrobulbar-blood-flow-and-choroidal-thickness-in-patients-with-rheumatoid-arthritis
#7
Ali Kal, Enes Duman, Almila Sarıgül Sezenöz, Mahmut Oğuz Ulusoy, Öznur Kal
PURPOSE: To evaluate whether retrobulbar blood flow and choroidal thickness (CT) are affected in patients with rheumatoid arthritis (RA), and the relationship between these values. METHODS: We evaluated 40 eyes of 20 RA patients and 40 eyes of 20 healthy controls. The enhanced depth imaging optical coherence tomography, color Doppler imaging, was held. Statistical analysis was performed. RESULTS: Peak systolic velocity (PSV) of ophthalmic (OA) and central retinal artery (CRA) were significantly higher in RA...
July 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28730399/optical-coherence-tomography-angiography-findings-in-susac-s-syndrome-a-case-report
#8
Rodolfo Mastropasqua, Lisa Toto, Alfonso Senatore, Alessandro D'Uffizi, Piergiorgio Neri, Cesare Mariotti, Marica Tina Maccarone, Luca Di Antonio
PURPOSE: To report clinical features of Susac's syndrome (SS) using optical coherence tomography angiography (OCTA). METHODS: Case report. RESULTS: A 25-year-old Caucasian female with a history of non-pulsatile migraine, tinnitus, and verbal apraxia complaining of peripheral scotoma in left eye due to branch retinal arteriole occlusion (BRAO) was diagnosed as having SS after audiometric test, brain magnetic resonance imaging, and multimodal retinal imaging...
July 20, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28730114/diagnostic-capability-of-peripapillary-retinal-nerve-fiber-layer-parameters-in-time-domain-versus-spectral-domain-optical-coherence-tomography-for-assessing-glaucoma-in-high-myopia
#9
Mei-Ching Teng, Yi-Chieh Poon, Kuo-Chi Hung, Hsueh-Wen Chang, Ing-Chou Lai, Jen-Chia Tsai, Pei-Wen Lin, Chien-Yun Wu, Chueh-Tan Chen, Pei-Chang Wu
AIM: To evaluate and compare the diagnostic capabilities of peripapillary retinal nerve fiber layer (p-RNFL) parameters of Spectralis optical coherence tomography (OCT) versus Stratus OCT to detect glaucoma in patients with high myopia. METHODS: This is a retrospective, cross-sectional study. Sixty highly myopic eyes of 60 patients were enrolled, with 30 eyes in the glaucoma group and 30 eyes in the control group. All eyes received peripapillary imaging of the optic disc using Stratus and Spectralis OCT...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28730110/incidence-of-cystoid-macular-edema-after-descemet-s-stripping-automated-endothelial-keratoplasty
#10
Eduard Pedemonte-Sarrias, Toni Salvador Playà, Irene Sassot Cladera, Oscar Gris, Joan Ribas Martínez, José García-Arumí, Núria Giménez
AIM: To determine the incidence of cystoid macular edema (CME) after Descemet's stripping automated endothelial keratoplasty (DSAEK). METHODS: This study included all consecutive patients operated in a Spanish tertiary reference hospital over a period of four years. A total of 55 eyes from 47 patients matched the selection criteria. CME was diagnosed clinically at the slit-lamp and confirmed by optical coherence tomography. RESULTS: Six cases of CME were diagnosed postoperatively, which represented an incidence of 11%...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28730092/parameters-of-ocular-fundus-on-spectral-domain-optical-coherence-tomography-for-glaucoma-diagnosis
#11
REVIEW
Yu-Lin Tao, Li-Ming Tao, Zheng-Xuan Jiang, He-Ting Liu, Kun Liang, Mo-Han Li, Xuan-Sheng Zhu, Yan-Lin Ren, Bing-Jie Cui
In this review, we summarize the progression of several parameters assessed by spectral-domain optical coherence tomography (SD-OCT) in recent years for the detection of glaucoma. Monitoring the progression of defects in the retinal nerve fiber layer (RNFL) thickness is essential. Imaging and analysis of retinal ganglion cells (RGCs) and inner plexiform layer (IPL), respectively, have been of great importance. Optic nerve head (ONH) topography obtained from 3D SD-OCT images is another crucial step. Other important assessments involve locating the Bruch's membrane opening (BMO), estimating the optic disc size and rim area, and measuring the lamina cribrosa displacement...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28729948/algorithms-for-the-automated-analysis-of-age-related-macular-degeneration-biomarkers-on-optical-coherence-tomography-a-systematic-review
#12
REVIEW
Maximilian W M Wintergerst, Thomas Schultz, Johannes Birtel, Alexander K Schuster, Norbert Pfeiffer, Steffen Schmitz-Valckenberg, Frank G Holz, Robert P Finger
PURPOSE: To assess the quality of optical coherence tomography (OCT) grading algorithms for retinal biomarkers of age-related macular degeneration (AMD). METHODS: Following a systematic review of the literature data on detection and quantification of AMD retinal biomarkers by available algorithms were extracted and descriptively synthesized. Algorithm quality was assessed using a modified version of the Quality Assessment of Diagnostic Accuracy Studies 2 checklist with a focus on accuracy against established reference standards and risk of bias...
July 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28729947/associations-between-optic-nerve-head-related-anatomical-parameters-and-refractive-error-over-the-full-range-of-glaucoma-severity
#13
Neda Baniasadi, Mengyu Wang, Hui Wang, Mufeed Mahd, Tobias Elze
PURPOSE: To evaluate the associations between optic disc (OD)-related anatomical parameters (interartery angle [IAA] between superior and inferior temporal retinal arteries, OD tilt [TL], rotation [ROT], and torsion [TO], OD surface curvature [CUR], and central retinal vessel trunk entry point location [CRVTL] on OD) and the spherical equivalent of refractive error (SE), and to assess the impact of glaucoma severity on these relationships. METHODS: Cirrus optical coherence tomography (OCT) fundus images and 24-2 visual fields of 438 patients were included...
July 2017: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/28729551/change-in-choroidal-blood-flow-and-choroidal-morphology-due-to-segmental-scleral-buckling-in-eyes-with-rhegmatogenous-retinal-detachment
#14
Takeshi Iwase, Misato Kobayashi, Kentaro Yamamoto, Kosei Yanagida, Eimei Ra, Hiroko Terasaki
Although scleral buckling is a well-established surgical treatment for rhegmatogenous retinal detachment (RRD), the procedure can reportedly cause problems in the ocular circulation. Segmental scleral bucking without a concomitant encircling procedure was performed on 46 eyes with successfully reattached macula-on RRD. Choroidal blood flow was assessed using laser speckle flowgraphy. Spectral-domain optical coherence tomography was used to image macular regions, to measure the subfoveal choroidal thickness (SFCT), and to calculate the luminal and the stromal areas by the binarization method preoperatively and 1, 4, 8 and 12 weeks postoperatively...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729378/very-early-great-saphenous-vein-graft-aneurysm-treated-by-percutaneous-coronary-intervention-under-chromaflo-imaging-guidance
#15
Tetsuo Yamaguchi, Takamichi Miyamoto, Kandoh Kawahatsu, Toshihiro Nozato
A 73-year-old man, who had undergone coronary artery bypass grafting (CABG) 10 days prior, presented with a great saphenous vein graft aneurysm (SVGA). CT revealed the increasing size of the aneurysm. Since the SVGA occurred immediately after CABG and there were no other complications, the aneurysm was treated percutaneously. While intravascular ultrasonography (IVUS) and optical coherence tomography failed to detect the entry point, an IVUS catheter with the addition of ChromaFlo imaging clearly revealed the entry point, size and length of the SVGA...
July 19, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28729372/intraoperative-optical-coherence-tomography-compatible-surgical-instruments-for-real-time-image-guided-ophthalmic-surgery
#16
Justis P Ehlers, Atsuro Uchida, Sunil K Srivastava
Intraoperative optical coherence tomography (OCT) is a potentially transformational technology that is now commercially available to ophthalmic surgeons. Currently, the use of the technology is primarily limited to a 'stop and image' approach due to the lack of OCT compatibility with surgical instrumentation. In this report, we describe multiple OCT-compatible surgical instruments that were developed for various surgical needs, based on previous evaluation of potential surgical materials for optical features and physical properties...
July 20, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28729370/anterior-segment-optical-coherence-tomography-angle-and-vault-analysis-after-toric-and-non-toric-implantable-collamer-lens-v4c-implantation-in-patients-with-high-myopia
#17
Guillermo Garcia-De la Rosa, Andrew Olivo-Payne, Juan Carlos Serna-Ojeda, Maria Sandra Salazar-Ramos, Alejandro Lichtinger, Arturo Gomez-Bastar, Arturo Ramirez-Miranda, Alejandro Navas, Enrique O Graue-Hernandez
OBJECTIVE: To assess anterior segment changes, including iridocorneal angle and vault, after toric and non-toric implantable collamer lens (ICL) V4c (STAAR Surgical AG) implantation under different lighting conditions. METHODS: Longitudinal, prospective, case series. Patients with high myopia (>6 dioptres) underwent toric and non-toric ICL V4c implantation. Optical coherence tomography measurements were taken under different lighting conditions preoperatively and at 1 week and 1, 6 and 12 months of follow-up...
July 20, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28728288/-descemet-s-membrane-endothelial-keratoplasty-for-treatment-of-patients-with-corneal-endothelial-decompensation
#18
T Huang, C Ouyang, J Zhan, L Jiang
Objective: To evaluate the clinical outcomes of Descemet's membrane endothelial keratoplasty (DMEK) for treatment of patients with corneal endothelial decompensation in China. Methods: Interventional case series. Ten patients (10 eyes) with the diagnosis of corneal endothelial decompensation received DMEK during July 2016 and September 2016 in Zhongshan Ophthalmic Center. Descemet's membrane of the donor tissue was carefully stripped from the underlying stroma manually and cut with a 7.75- or 8.0-mm-diameter donor punch...
July 11, 2017: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/28728188/diagnosing-choroidal-neovascularization-in-asymptomatic-individuals-using-optical-coherence-tomography-angiography
#19
Michael M Park, Carl B Rebhun, Emily D Cole, Ricardo N Louzada, Eduardo A Novais, Fareed Rifai, A Yasin Alibhai, Jay S Duker, Nadia K Waheed
Optical coherence tomography angiography (OCTA) is a noninvasive, rapid imaging technique that generates angiographic images without intravenous dye injections. Cross-sectional studies have described the presence of asymptomatic choroidal neovascularization (CNV) in patients with intermediate age-related macular degeneration (AMD). This case report describes the OCT features on longitudinal follow-up of a patient who started with unilateral asymptomatic CNV and eventually developed symptomatic exudative AMD...
July 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28728187/in-vivo-microvascular-pattern-of-solitary-juxtapapillary-capillary-hemangioma-on-oct-angiography
#20
M B Thirumalesh, Astha Jain, Sumeet Agrawal, K Bhujang Shetty
Juxtapapillary capillary hemangioma (JCH) is a vascular hamartoma. Fluorescein fundus angiography aids in diagnosis. The vascular morphology of this tumor has not been documented with optical coherence tomography angiography (OCTA), a new, noninvasive diagnostic modality that provides high-resolution images of vascular pattern based on blood flow in the retina and choroid. Although mainly a clinical diagnosis, OCTA helps in studying the intrinsic vascularity of the tumor and helps in differentiating it from other vascular tumors...
July 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
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