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https://www.readbyqxmd.com/read/27893521/lower-tear-meniscus-measurements-using-a-new-anterior-segment-swept-source-optical-coherence-tomography-and-agreement-with-fourier-domain-optical-coherence-tomography
#1
Pedro Arriola-Villalobos, José Ignacio Fernández-Vigo, David Díaz-Valle, Jaime Almendral-Gómez, Cristina Fernández-Pérez, José M Benítez-Del-Castillo
PURPOSE: To assess intraobserver repeatability and interobserver and intersession reproducibility of lower tear meniscus height (LTMH) measurements obtained using a new anterior segment swept-source optical coherence tomography (SS-OCT) device. Agreement with Fourier-domain (FD) OCT (Spectralis) was also examined. METHODS: In an observational cross-sectional study, one eye of 29 healthy subjects was randomly imaged with both devices at our center. Two examiners then randomly measured the LTMH using the software's calipers...
November 23, 2016: Cornea
https://www.readbyqxmd.com/read/27881909/comparison-of-choroidal-thickness-measurements-between-spectral-domain-oct-and-swept-source-oct-in-normal-and-diseased-eyes
#2
Sidra Zafar, Ma Rehman Siddiqui, Rida Shahzad
PURPOSE: Sub-foveal choroidal thickness (SFCT) is affected in many ocular diseases. The aim of this study was to compare SFCT measurements between Topcon 3D 2000 spectral-domain optical coherence tomography (SD-OCT) and Topcon swept-source OCT (SS-OCT), with different laser wavelengths, in normal and diseased populations. MATERIALS AND METHODS: This was a prospective, cross-sectional, noninterventional study including 27 normal volunteers and 27 participants with retinal disease...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27872333/three-dimensional-analysis-of-enamel-crack-behavior-using-optical-coherence-tomography
#3
M S Segarra, Y Shimada, A Sadr, Y Sumi, J Tagami
The aim of this study was to nondestructively analyze enamel crack behavior on different areas of teeth using 3D swept source-optical coherence tomography (SS-OCT). Ten freshly extracted human teeth of each type on each arch (n = 80 teeth) were inspected for enamel crack patterns on functional, contact and nonfunctional, or noncontact areas using 3D SS-OCT. The predominant crack pattern for each location on each specimen was noted and analyzed. The OCT observations were validated by direct observations of sectioned specimens under confocal laser scanning microscopy (CLSM)...
November 21, 2016: Journal of Dental Research
https://www.readbyqxmd.com/read/27856030/comparison-between-widefield-en-face-swept-source-oct-and-conventional-multimodal-imaging-for-the-detection-of-reticular-pseudodrusen
#4
Karen B Schaal, Andrew D Legarreta, William J Feuer, Giovanni Gregori, Qianqian Cheng, John E Legarreta, Mary K Durbin, Paul F Stetson, Sophie Kubach, Philip J Rosenfeld
PURPOSE: The ability to detect reticular pseudodrusen (RPD)/subretinal drusenoid deposits (SDDs) using 12×12-mm widefield en face swept-source optical coherence tomography (SS-OCT) imaging was compared with conventional multimodal imaging (color, fundus autofluorescence (FAF), and infrared reflectance [IR] imaging) in eyes with nonexudative age-related macular degeneration (AMD). DESIGN: Cross-sectional study. PARTICIPANTS: Patients with nonexudative AMD were prospectively enrolled in an SS-OCT imaging study at the Bascom Palmer Eye Institute...
November 14, 2016: Ophthalmology
https://www.readbyqxmd.com/read/27849651/duration-of-prone-positioning-after-macular-hole-surgery-determined-by-swept-source-optical-coherence-tomography
#5
Masahiko Sano, Makoto Inoue, Yuji Itoh, Yoshiyuki Kita, Kazunari Hirota, Takashi Koto, Akito Hirakata
PURPOSE: To compare the closure rate of macular hole closure and duration of the prone positioning after macular hole (MH) surgery with two protocols for halting the prone positioning. METHODS: The authors studied 129 eyes of 125 consecutive patients with MH who had undergone vitrectomy. In 60 eyes of 59 patients, the prone positioning was halted after detecting an MH closure in the swept-source optical coherence tomographic images (SS group). In 69 eyes of 66 patients, the prone position was halted by the surgeon's decision (conventional group)...
November 15, 2016: Retina
https://www.readbyqxmd.com/read/27847691/a-single-wide-field-oct-protocol-can-provide-compelling-information-for-the-diagnosis-of-early-glaucoma
#6
Donald C Hood, Nicole De Cuir, Dana M Blumberg, Jeffrey M Liebmann, Ravivarn Jarukasetphon, Robert Ritch, Carlos G De Moraes
PURPOSE: To evaluate a report for glaucoma diagnosis based on a single optical coherence tomography (OCT) protocol. METHODS: A wide-field (9 × 12 mm) swept-source (SS) OCT scan, encompassing the macula and disc, was obtained on 130 eyes (patients) with or suspected open-angle glaucoma, a mean deviation greater than or equal to -6 dB on a 24-2 visual field (VF), and spherical refractive error between ± 6 diopters (D). The single-page report contained a circumpapillary retinal nerve fiber layer (cpRNFL) thickness plot; retinal ganglion cell layer and retinal nerve fiber layer (RNFL) thickness and probability plots of the macula and optic nerve; and an enface slab image of the optic nerve...
November 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/27847643/novel-perspectives-on-swept-source-optical-coherence-tomography
#7
REVIEW
Fabio Lavinsky, Daniel Lavinsky
Technologies for multimodal digital imaging of vitreoretinal diseases have improved the accuracy of diagnosis and the depth of the knowledge of the mechanisms of disease and their response to treatments. Optic coherence tomography (OCT) has become a mandatory tool for the management and for the follow-up of retinal pathologies. OCT technology evolved in the last two decades from time-domain to spectral domain and recently to the swept-source OCTs (SS-OCT). SS-OCT improved the depth of imaging and the scan speed, thus adding novel algorithms and features such as for vitreous and vitreoretinal interface evaluation, choroid segmentation and mapping, OCT angiography and En-face OCT...
2016: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/27847631/multimodal-imaging-of-bilateral-diffuse-uveal-melanocytic-proliferation-associated-with-an-iris-mass-lesion
#8
Jonathan Naysan, Claudine E Pang, Robert W Klein, K Bailey Freund
BACKGROUND: Bilateral diffuse uveal melanocytic proliferation (BDUMP) is a rare, paraneoplastic syndrome characterized by bilateral painless visual loss and proliferation of choroidal melanocytes in association with an underlying systemic malignancy. We report a case of bilateral diffuse uveal melanocytic proliferation associated with an underlying gynecological malignancy that also features the infrequent finding of an iris mass lesion, using multimodal imaging including ultra-widefield imaging, spectral domain and swept-source optical coherence tomography...
2016: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/27828911/characterization-and-differentiation-of-polypoidal-choroidal-vasculopathy-using-swept-source-optical-coherence-tomography-angiography
#9
Chui Ming Gemmy Cheung, Yasuo Yanagi, Aditi Mohla, Shu Yen Lee, Ranjana Mathur, Choi Mun Chan, Ian Yeo, Tien Yin Wong
PURPOSE: To determine the correlation and agreement between swept-source optical coherence tomography angiography (SS-OCT-A) with fluorescein angiography (FA), indocyanine green angiography (ICGA) and spectral domain OCT (SD-OCT) in characterizing polypoidal choroidal vasculopathy (PCV) and in differentiating eyes with typical age-related macular degeneration (t-AMD). METHODS: This study included 32 and 54 eyes with t-AMD and PCV, respectively, who underwent SS-OCT-A, SD-OCT, fluorescein angiography, and indocyanine green angiography...
November 8, 2016: Retina
https://www.readbyqxmd.com/read/27827444/associated-factors-for-visibility-and-width-of-retrobulbar-subarachnoid-space-on-swept-source-optical-coherence-tomography-in-high-myopia
#10
Hua Fan, Hongjie Ma, Rulong Gao, Danny Siu-Chun Ng, Carol Y Cheung, Shuangnong Li, Dezheng Wu, Shibo Tang
Subarachnoid space (SAS) around optic nerve can be visible with swept-source optical coherence tomography (SS-OCT). However, the relevant factors for its visibility and width have not been reported. In this prospective study, 193 eyes with high myopia were evaluated by SS-OCT. The relationship between age, gender, axial length, optic disc area, parapapillary atrophy (PPA) area, peripapillary choroidal thickness with the visibility and width of SAS were assessed. The results showed that SAS was observed in 125 (64...
November 9, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27784274/preserved-retinal-sensitivity-in-spatial-correspondence-to-an-intrachoroidal-cavitation-area-with-full-thickness-retinal-defect-a-case-report
#11
Yoshiyuki Kita, Makoto Inoue, Gábor Hollό, Ritsuko Kita, Masahiko Sano, Akito Hirakata
BACKGROUND: Intrachoroidal cavitation (ICC) in the temporal peripapillary area is a relatively frequent finding in high myopia. However, ICC associated with a full thickness retinal defect rarely observed. We report an unusual case of ICC combined with a full thickness retinal defect in the papillo-macular bundle, in which the spatially corresponding visual field sensitivity was preserved. CASE PRESENTATION: A high myopic and pseudophakic left eye of a 79-year-old Japanese woman was evaluated with swept source optical coherence tomography (SS-OCT) and Humphrey 30-2 visual field testing for moderate glaucoma...
October 26, 2016: BMC Ophthalmology
https://www.readbyqxmd.com/read/27759864/analysis-of-scleral-feeder-vessel-in-myopic-choroidal-neovascularization-using-optical-coherence-tomography-angiography
#12
Ricardo Noguera Louzada, Daniela Ferrara, Eduardo Amorim Novais, Eric Moult, Emily Cole, Mark Lane, James Fujimoto, Jay S Duker, Caroline R Baumal
To describe the appearance of a scleral-derived feeder vessel in a highly myopic eye with secondary choroidal neovascularization (CNV) as visualized on both en face high-speed swept-source (SS) optical coherence tomography angiography (OCTA) prototype, and a commercially available spectral-domain (SD) OCTA, with the corresponding en face and cross-sectional structural OCT images. In this case report, a 60-year-old white male presented with high myopia and secondary CNV in the right eye, previously treated with anti-vascular endothelial growth factor, and was imaged on both SD-OCT and SS-OCT...
October 1, 2016: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/27740940/spectral-phase-based-automatic-calibration-scheme-for-swept-source-based-optical-coherence-tomography-systems
#13
K M Ratheesh, L K Seah, V M Murukeshan
The automatic calibration in Fourier-domain optical coherence tomography (FD-OCT) systems allows for high resolution imaging with precise depth ranging functionality in many complex imaging scenarios, such as microsurgery. However, the accuracy and speed of the existing automatic schemes are limited due to the functional approximations and iterative operations used in their procedures. In this paper, we present a new real-time automatic calibration scheme for swept source-based optical coherence tomography (SS-OCT) systems...
October 14, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27721783/swept-source-optical-coherence-tomography-detecting-intraoperative-acute-descemet-s-fold-formation
#14
Yu Ichioka, Akihito Uji, Nagahisa Yoshimura
BACKGROUND: To present an intraoperative acute Descemet's fold formation using swept-source optical coherence tomography (SS-OCT) imaging. CASE REPORT: A 67-year-old man complaining of reduced visual acuity in the left eye. A 25-gauge pars plana vitrectomy combined with phacoemulsification cataract surgery was performed to remove the vitreomacular traction. When hydro-sealing was performed, striae rapidly spread in the cornea. SS-OCT B-scan images performed on postoperative day 1 revealed a wavy Descemet's membrane that might correspond to Descemet's folds...
May 2016: Case Reports in Ophthalmology
https://www.readbyqxmd.com/read/27704033/optical-analysis-of-enamel-and-dentin-caries-in-relation-to-mineral-density-using-swept-source-optical-coherence-tomography
#15
Tomoka Ueno, Yasushi Shimada, Khairul Matin, Yuan Zhou, Ikumi Wada, Alireza Sadr, Yasunori Sumi, Junji Tagami
The aim of this study was to evaluate the signal intensity and signal attenuation of swept source optical coherence tomography (SS-OCT) for dental caries in relation to the variation of mineral density. SS-OCT observation was performed on the enamel and dentin artificial demineralization and on natural caries. The artificial caries model on enamel and dentin surfaces was created using Streptococcus mutans biofilms incubated in an oral biofilm reactor. The lesions were centrally cross sectioned and SS-OCT scans were obtained in two directions to construct a three-dimensional data set, from the lesion surface (sagittal scan) and parallel to the lesion surface (horizontal scan)...
July 2016: Journal of Medical Imaging
https://www.readbyqxmd.com/read/27695284/noninvasive-detection-of-microaneurysms-in-diabetic-retinopathy-by-swept-source-optical-coherence-tomography
#16
Sarah Cheng, Theodore Leng
BACKGROUND AND OBJECTIVES: A method of identifying retinal vascular microaneurysms (MAs) in nonproliferative diabetic retinopathy (NPDR) using swept-source optical coherence tomography (SS-OCT). PATIENTS AND METHODS: SS-OCT images were acquired in 17 eyes with NPDR using prototype SS-OCT device and fluorescein angiography (FA) images were obtained simultaneously. MAs identified on SS-OCT slabs were correlated to MAs identified on FA. RESULTS: MAs were identified in SS-OCT slabs in 15/17 eyes, resulting in NPDR diagnosis rate of 88%...
2016: Clinical Ophthalmology
https://www.readbyqxmd.com/read/27688910/evaluation-of-anterior-chamber-volume-in-cataract-patients-with-swept-source-optical-coherence-tomography
#17
Wenwen He, Xiangjia Zhu, Don Wolff, Zhennan Zhao, Xinghuai Sun, Yi Lu
Purpose. To evaluate the anterior chamber volume in cataract patients with Swept-Source Optical Coherence Tomography (SS-OCT) and its influencing factors. Methods. Anterior chamber volume of 92 cataract patients was evaluated with SS-OCT in this cross-sectional study. Univariate analyses and multiple linear regression were used to investigate gender, age, operated eye, posterior vitreous detachment, lens opacity grading, and axial length (AXL) related variables capable of influencing the ACV. Results. The average ACV was 139...
2016: Journal of Ophthalmology
https://www.readbyqxmd.com/read/27664702/axial-length-measurement-failure-rates-with-biometers-using-swept-source-optical-coherence-tomography-compared-to-partial-coherence-interferometry-and-optical-low-coherence-interferometry
#18
Colm McAlinden, Qinmei Wang, Rongrong Gao, Weiqi Zhao, Ayong Yu, Yu Li, Yan Guo, Jinhai Huang
PURPOSE: To compare a new swept-source optical coherence tomography (SSOCT)-based biometer (OA-2000) with the IOLMaster v5.4 (partial-coherence interferometry) and Aladdin (optical low-coherence interferometry) biometers in terms of axial length measurement and failure rate in eyes with cataract. DESIGN: Reliability study. METHODS: A total of 377 eyes of 210 patients were scanned with the 3 biometers in a random order. For each biometer, the number of unobtainable axial length measurements was recorded and grouped as per the type and severity of cataract based on the Lens Opacities Classification System III by the same experienced ophthalmologist...
January 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/27662409/swept-source-optical-coherence-tomography-validates-lamina-cribrosa-anomaly-in-optic-disk-pit
#19
Kumar Sambhav, Sandeep Grover, K V Chalam
PURPOSE: Swept Source Optical Coherence Tomography validates lamina cribrosa anomaly in optic disk pit. METHOD: Observational case report. RESULTS: A 25-year-old African American male presented with decreased vision in right eye of 4 days duration. Best corrected visual acuity (BCVA) for distance in right eye was 20/200 and in left eye was 20/20. Dilated fundus examination of right eye showed serous macular detachment of entire posterior pole along with an optic pit on temporal margin of optic disk...
September 22, 2016: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/27661607/optimization-of-a-dispersion-tuned-wavelength-swept-fiber-laser-for-optical-coherence-tomography
#20
Yuya Takubo, Takuma Shirahata, Shinji Yamashita
We optimized parameters of a dispersion-tuned wavelength-swept fiber laser by numerically analyzing dynamic characteristics. The optimized laser is experimentally demonstrated and applied to the swept-source optical coherence tomography (SS-OCT) system. The dispersion-tuned wavelength-swept laser (DT-WSL) is a unique tunable fiber laser, whose lasing wavelength can be tuned rapidly without any mechanical tunable filters. Although the wavelength of a DT-WSL can be swept rapidly and widely, the broadening of the instantaneous spectral width at a high sweep rate has been a critical drawback for SS-OCT applications...
September 20, 2016: Applied Optics
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