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https://www.readbyqxmd.com/read/28510576/comparison-of-peripapillary-choroidal-thickness-between-healthy-subjects-and-patients-with-parkinson-s-disease
#1
Elena Garcia-Martin, Luis E Pablo, Maria P Bambo, Raquel Alarcia, Vicente Polo, Jose M Larrosa, Elisa Vilades, Beatriz Cameo, Elvira Orduna, Teresa Ramirez, Maria Satue
PURPOSE: To study peripapillary choroidal thickness (PPCT) in healthy subjects using swept-source optical coherence tomography (SS-OCT), and to evaluate PPCT differences between Parkinson´s disease (PD) patients, and age- and sex-matched healthy controls. DESIGN: Case-control study. METHODS: 80 healthy subjects and 40 PD patients were consecutively recruited in this single institution study. The healthy subjects were divided into two populations: a teaching population (n = 40, used to establish choroidal zones) and a validating population (n = 40, used to compare measurements with PD patients)...
2017: PloS One
https://www.readbyqxmd.com/read/28499050/swept-source-oct-visualization-of-macular-hole-closure-in-gas-filled-eyes
#2
Daniel Q Li, Netan Choudhry
BACKGROUND AND OBJECTIVE: To assess the utility of swept-source optical coherence tomography (SS-OCT) in visualizing macular hole (MH) closure through gas-filled eyes on postoperative day (POD) 1 using a dual scanning protocol. PATIENTS AND METHODS: We examined 30 consecutive patients with full-thickness MH who underwent standard vitrectomy with SF6 (25%) gas tamponade between July 2015 and April 2016. SS-OCT imaging was performed using horizontal raster and 16-line radial scans with manual delicate focusing to evaluate MH closure status...
May 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28485132/robust-numerical-phase-stabilization-for-long-range-swept-source-optical-coherence-tomography
#3
Shaozhen Song, Jingjiang Xu, Shaojie Men, Tueng T Shen, Ruikang K Wang
A novel phase stabilization technique is demonstrated with significant improvement in the phase stability of a micro-electromechanical (MEMS) vertical cavity surface-emitting laser (VCSEL) based swept-source optical coherence tomography (SS-OCT) system. Without any requirements of hardware modifications, the new fully numerical phase stabilization technique features high tolerance to acquisition jitter, and significantly reduced budget in computational effort. We demonstrate that when measured with biological tissue, this technique enables a phase sensitivity of 89 mrad in highly scattering tissue, with image ranging distance of up to 12...
May 9, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28470437/feasibility-of-swept-source-oct-for-active-birdshot-chorioretinopathy
#4
Olga Garcia-Garcia, Sara Jordan-Cumplido, Olaia Subira-Gonzalez, Pere Garcia-Bru, Luis Arias, Josep M Caminal-Mitjana
PURPOSE: To assess the feasibility of swept-source optical coherence tomography (SS-OCT) for clinical follow-up of patients with birdshot chorioretinopathy (BC). METHODS: Prospective longitudinal, observational, 12-month case-control study in a tertiary care center. The study population included 12 patients (24 eyes) diagnosed with BC and 21 age- and sex-matched healthy controls (42 eyes). The macular areas in both affected and healthy eyes were prospectively analyzed with SS-OCT at 1050 nm, using 2D 12...
May 3, 2017: Graefe's Archive for Clinical and Experimental Ophthalmology
https://www.readbyqxmd.com/read/28446793/demonstration-of-shot-noise-limited-swept-source-oct-without-balanced-detection
#5
Vala Fathipour, Tilman Schmoll, Alireza Bonakdar, Skylar Wheaton, Hooman Mohseni
Optical coherence tomography (OCT) has been utilized in a rapidly growing number of clinical and scientific applications. In particular, swept source OCT (SS-OCT) has attracted many attentions due to its excellent performance. So far however, the limitations of existing photon detectors have prevented achieving shot-noise-limited sensitivity without using balanced-detection scheme in SS-OCT, even when superconducting single-photon detectors were used. Unfortunately, balanced-detection increases OCT system size and cost, as it requires many additional components to boost the laser power and maintain near ideal balanced performance across the whole optical bandwidth...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440591/imaging-collector-channel-entrance-with-a-new-intraocular-micro-probe-swept-source-optical-coherence-tomography
#6
Chen Xin, Xiaoya Chen, Meng Li, Yan Shi, Huaizhou Wang, Ruikang Wang, Ningli Wang
PURPOSE: To describe the use of a newly developed side-viewing catheter probe to provide the cross-sectional images of collector channel entrance (CCE), achieved by swept-source optical coherence tomography (SS-OCT). METHODS: A side-viewing SS-OCT catheter probe was developed that has a core probe diameter of 0.15 mm and an outer diameter of 0.25 mm, for the purpose of imaging CCEs within eye globe. Cadaver eyes harvested from swine and human were used to demonstrate its feasibility...
April 25, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28433536/assessment-of-enamel-cracks-at-adhesive-cavosurface-margin-using-three-dimensional-swept-source-optical-coherence-tomography
#7
Tomoko Tabata, Yasushi Shimada, Alireza Sadr, Junji Tagami, Yasunori Sumi
OBJECTIVES: Swept-source optical coherence tomography (SS-OCT) can construct cross-sectional images of internal biological structures. The aim of this study was to evaluate enamel cracks at the cavosurface margin of composite restorations using SS-OCT. METHODS: Bowl-shaped cavities were prepared at two locations (mid-coronal and cervical regions) on the enamel surface of 60 bovine teeth. Half of the cavities (30) were treated with phosphoric acid gel. A two-step self-etch adhesive (Clearfil SE Bond) was applied to all cavities and a flowable composite was placed in bulk...
April 19, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28432110/anterior-but-not-posterior-choroid-changed-before-and-during-valsalva-manoeuvre-in-healthy-chinese-a-ubm-and-ss-oct-study
#8
Fei Li, Kai Gao, Xingyi Li, Shida Chen, Wenbin Huang, Xiulan Zhang
PURPOSE: To determine if the anterior choroid is involved in ocular change during the Valsalva manoeuvre (VM). MATERIALS AND METHODS: Fifty-three healthy volunteers aged 18-65 years with normal visual field test results and no history of intraocular pressure (IOP) exceeding 21 mm Hg were recruited. Anterior and posterior choroidal changes before and during VM were recorded by ultrasound microscope and swept-source optical coherence tomography, respectively. Parameters of the anterior segment included ciliary body thickness (CBT0), thickness of the choroid at a distance of 4 mm from the root of the iris (CT4), anterior placement of the ciliary body (APCB) and trabecular-ciliary angle (TCA)...
April 21, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28414805/measurements-of-the-parapapillary-atrophy-zones-in-en-face-optical-coherence-tomography-images
#9
Atsuya Miki, Yasushi Ikuno, Robert N Weinreb, Junko Yokoyama, Tomoko Asai, Shinichi Usui, Kohji Nishida
OBJECTIVE: To measure the parapapillary atrophy (PPA) area in en face images obtained with swept-source optical coherence tomography (SS-OCT), and to evaluate its relationship to glaucoma, myopia, and age in non-highly myopic subjects. DESIGN: Retrospective, cross-sectional study. PARTICIPANTS: Fifty eyes of 30 subjects with open-angle glaucoma (G group) and forty-three eyes of 26 healthy control subjects (C group). Eyes with high myopia (spherical equivalent refractive error ≤ -8 diopters or axial length ≥ 26...
2017: PloS One
https://www.readbyqxmd.com/read/28410713/axial-length-measurements-comparison-of-a-new-swept-source-optical-coherence-tomography-based-biometer-and-partial-coherence-interferometry-in-myopia
#10
Jong Yun Yang, Hong Kyu Kim, Sung Soo Kim
PURPOSE: To compare axial length (AL) measurements between a swept-source optical coherence tomography (SS-OCT) biometer (IOLMaster 700) and a partial coherence interferometry (PCI) biometer (IOLMaster, version 5.4) in myopic eyes. SETTING: Severance Hospital, Yonsei University, Seoul, South Korea. DESIGN: Prospective evaluation of a diagnostic test. METHODS: This study enrolled patients with a diagnosis of myopia in their medical records...
March 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28410712/swept-source-optical-coherence-tomography-to-screen-for-macular-pathology-in-eyes-having-routine-cataract-surgery
#11
Sidra Zafar, M A Rehman Siddiqui, Rida Shahzad, Masroor H Shahzad
PURPOSE: To determine the incremental benefit of swept-source optical coherence tomography (SS-OCT) in identifying occult macular disease preoperatively in patients scheduled for routine cataract surgery. SETTING: Shahzad Eye Hospital, Karachi, Pakistan. DESIGN: Prospective case series. METHODS: Preoperative SS-OCT scans were performed in all patients scheduled to have cataract surgery between January and March 2016...
March 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28393321/usability-and-reproducibility-of-tear-meniscus-values-generated-via-swept-source-optical-coherence-tomography-and-the-slit-lamp-with-a-graticule-method
#12
Hitoshi Imamura, Hitoshi Tabuchi, Shunsuke Nakakura, Daisuke Nagasato, Hiroaki Baba, Yoshiaki Kiuchi
PURPOSE: To investigate the usability and the reproducibility of the tear meniscus values via swept-source optical coherence tomography (SS-OCT) and the conventional slit lamp microscope method with a graticule. METHODS: The right eye was examined in 90 healthy adult subjects who were grouped according to age (group 1: 20-39 years; group 2: 40-59 years; group 3: ≥60 years). The tear meniscus height (TMH) and tear meniscus area were measured using SS-OCT and TMH by the slit lamp microscope method...
April 9, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28384721/choroidal-vascular-flow-area-in-central-serous-chorioretinopathy-using-swept-source-optical-coherence-tomography-angiography
#13
Massimo Nicolò, Raffaella Rosa, Donatella Musetti, Maria Musolino, Michela Saccheggiani, Carlo Enrico Traverso
Purpose: To report the choroidal vascular flow area in eyes with central serous chorioretinopathy (CSC) compared with healthy subjects and unaffected fellow eyes using swept-source (SS) optical coherence tomography (OCT) angiography. Methods: Prospective case series of 19 eyes of 19 consecutive patients affected by CSC, compared with 15 unaffected fellow eyes and 20 eyes of 10 healthy subjects. Patients underwent SS-OCT angiography in order to evaluate the choroidal vascular flow area of choriocapillaris (CC) and deeper choroidal layers...
April 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28368998/diagnostic-ability-of-wide-field-retinal-nerve-fiber-layer-maps-using-swept-source-optical-coherence-tomography-for-detection-of-preperimetric-and-early-perimetric-glaucoma
#14
Won June Lee, Kyeong Ik Na, Young Kook Kim, Jin Wook Jeoung, Ki Ho Park
PURPOSE: To evaluate the diagnostic ability of wide-field retinal nerve fiber layer (RNFL) maps with swept-source optical coherence tomography (SS-OCT) for detection of preperimetric (PPG) and early perimetric glaucoma (EG). METHODS: One hundred eighty-four eyes, including 67 healthy eyes, 43 eyes with PPG, and 74 eyes with EG, were analyzed. Patients underwent a comprehensive ocular examination including red-free RNFL photography, visual field testing and wide-field SS-OCT scanning (DRI-OCT-1 Atlantis; Topcon, Tokyo, Japan)...
March 31, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28362762/phase-noise-analysis-of-swept-source-optical-coherence-tomography-systems
#15
Yuye Ling, Yu Gan, Xinwen Yao, Christine P Hendon
We propose a new model to characterize the phase noise in swept-source optical coherence tomography (SS-OCT). The new model explicitly incorporates scanning variability, timing jitter, and sample location in addition to intensity noise (shot noise). The model was analyzed and validated by using both Monte Carlo methods and experiments. We suggest that the proposed model can be used as a guideline for future SS-OCT experimental designs.
April 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28327613/robust-and-fast-characterization-of-oct-based-optical-attenuation-using-a-novel-frequency-domain-algorithm-for-brain-cancer-detection
#16
Wu Yuan, Carmen Kut, Wenxuan Liang, Xingde Li
Cancer is known to alter the local optical properties of tissues. The detection of OCT-based optical attenuation provides a quantitative method to efficiently differentiate cancer from non-cancer tissues. In particular, the intraoperative use of quantitative OCT is able to provide a direct visual guidance in real time for accurate identification of cancer tissues, especially these without any obvious structural layers, such as brain cancer. However, current methods are suboptimal in providing high-speed and accurate OCT attenuation mapping for intraoperative brain cancer detection...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28327553/choroidal-thickness-in-3001-chinese-children-aged-6-to-19-years-using-swept-source-oct
#17
Shuyu Xiong, Xiangui He, Junjie Deng, Minzhi Lv, Jiali Jin, Sifei Sun, Chunxia Yao, Jianfeng Zhu, Haidong Zou, Xun Xu
The purpose of the cross-sectional study is to describe the values and distribution of choroidal thickness and to explore its related factors, especially age, in Chinese children. A total of 3001 Chinese school children aged 6 to 19 years underwent comprehensive ophthalmic examinations, including axial length and cycloplegic refraction. Choroidal thickness was measured by swept-source optical coherence tomography (SS-OCT). There was a greater difference in the more central regions between the myopes and emmetropes...
March 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299497/multimodal-imaging-in-a-case-of-butterfly-pattern-dystrophy-of-retinal-pigment-epithelium
#18
Vinod Kumar, Devesh Kumawat
AIMS: To report multi-modal imaging findings in a case of butterfly pattern dystrophy of retinal pigment epithelium. METHODS: A middle-aged female with butterfly pattern dystrophy, who presented with progressive loss of vision, was examined using coloured fundus photographs, short wave autofluorescence, swept source optical coherence tomography (SS-OCT), fundus fluorescein angiography and enface optical coherence tomography. RESULTS: Multi-modal imaging was useful in the characterization of the various disease features...
March 15, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28281863/multimodal-imaging-including-optical-coherence-tomography-angiography-in-serpiginous-choroiditis
#19
Seong Joon Ahn, Seung Hoon Park, Byung Ro Lee
PURPOSE: To report multimodal imaging in patients with serpiginous choroiditis. METHODS: A 60-year-old woman with active serpiginous choroiditis in the right eye was evaluated during the disease course with multimodal imaging, which included fluorescein angiography, swept-source optical coherence tomography (SS-OCT), OCT angiography, fundus autofluorescence (FAF), and retromode imaging. RESULTS: The patient had subretinal, yellowish lesion on the macula at presentation...
April 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28273316/comparison-between-spectral-domain-and-swept-source-optical-coherence-tomography-angiographic-imaging-of-choroidal-neovascularization
#20
Andrew R Miller, Luiz Roisman, Qinqin Zhang, Fang Zheng, Joao Rafael de Oliveira Dias, Zohar Yehoshua, Karen B Schaal, William Feuer, Giovanni Gregori, Zhongdi Chu, Chieh-Li Chen, Sophie Kubach, Lin An, Paul F Stetson, Mary K Durbin, Ruikang K Wang, Philip J Rosenfeld
Purpose: The purpose of this study was to compare imaging of choroidal neovascularization (CNV) using swept-source (SS) and spectral-domain (SD) optical coherence tomography angiography (OCTA). Methods: Optical coherence tomography angiography was performed using a 100-kHz SS-OCT instrument and a 68-kHz SD-OCTA instrument (Carl Zeiss Meditec, Inc.). Both 3 × 3- and 6 × 6-mm2 scans were obtained on both instruments. The 3 × 3-mm2 SS-OCTA scans consisted of 300 A-scans per B-scan at 300 B-scan positions, and the SD-OCTA scans consisted of 245 A-scans at 245 B-scan positions...
March 1, 2017: Investigative Ophthalmology & Visual Science
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