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optical coherence tomograph

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https://www.readbyqxmd.com/read/27896899/characterization-of-a-novel-form-of-progressive-retinal-atrophy-in-whippet-dogs-a-clinical-electroretinographic-and-breeding-study
#1
André Tavares Somma, Juan Carlos Duque Moreno, Mario Teruo Sato, Blanche Dreher Rodrigues, Marianna Bacellar-Galdino, Laurence Mireille Occelli, Simon Michael Petersen-Jones, Fabiano Montiani-Ferreira
OBJECTIVE: To describe a form of progressive retinal atrophy (PRA) in Whippets including clinical, electroretinographic, optical coherence tomographic changes and pedigree analysis. ANIMALS STUDIED: Client-owned Whippet dogs (n = 51) living in Brazil. PROCEDURES: All animals were submitted for routine ophthalmic screening for presumed inherited ocular disease, which included the following: visual tests, such as obstacle course tests, in scotopic and photopic conditions, cotton ball test, dazzle reflex, ocular fundus evaluation by indirect ophthalmoscopy followed by fundus photography...
November 29, 2016: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/27889345/histopathological-differential-diagnosis-of-optical-coherence-tomographic-image-interpretation-after-stenting
#2
Christoph Lutter, Hiroyoshi Mori, Kazuyuki Yahagi, Elena Ladich, Michael Joner, Robert Kutys, David Fowler, Maria Romero, Jagat Narula, Renu Virmani, Aloke V Finn
OBJECTIVES: The aim of this study was to identify histological features that correlate with terms commonly used to describe optical coherence tomographic (OCT) and optical frequency-domain imaging (OFDI) images of stented vessels, by means of a histopathological validation study using stented human coronary arteries. BACKGROUND: OCT imaging and OFDI are used to evaluate vascular responses to stent implantation. Descriptive terms such as "peristrut low attenuation" and "heterogeneous" have been used to describe neointimal characteristics that may have clinical relevance...
November 19, 2016: JACC. Cardiovascular Interventions
https://www.readbyqxmd.com/read/27870778/inter-visit-test-retest-variability-of-oct-in-glaucoma
#3
John Graham Pearce, Ted Maddess
PURPOSE: To determine the inter-visit test-retest variability (TRV) of a spectral domain optical coherence tomograph, the Topcon 3D OCT-2000, in the measurement of optic nerve head topography, peripapillary retinal nerve fiber layer (pRNFL), and macular ganglion cell complex (GCC) parameters in glaucoma patients. We also examine whether TRV with this instrument varies with the extent of glaucomatous damage. METHODS: Twenty-four subjects with varying degrees of glaucoma severity provided 41 eyes with usable results for the study...
November 19, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27853954/spectral-domain-optical-coherence-tomography-findings-in-idiopathic-lamellar-macular-hole
#4
Elena Zampedri, Federica Romanelli, Francesco Semeraro, Barbara Parolini, Rino Frisina
BACKGROUND: To evaluate demographic, functional, and morphological parameters of idiopathic lamellar macular hole (ILMH). METHODS: Observational longitudinal retrospective study. Optical coherence tomography examinations and corresponding clinical charts of a series of consecutive patients affected by ILMH, between January 2010 and March 2015, from the database of the Department of Ophthalmology of Trento Hospital, Italy, have been collected and examined. Demographic and functional parameters were: age (year), gender (male/female), eye (right/left), lens status, best-corrected visual acuity (BCVA) in logarithm of the minimum angle of resolution (LogMAR)...
November 16, 2016: Graefe's Archive for Clinical and Experimental 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/27833968/posterior-vitreous-detachment-and-macular-anatomical-changes-a-tomographic-electroretinographic-study
#6
Alin Ştefan Ştefănescu-Dima, Cornelia Andreea Corîci, Maria Rodica Mănescu, Teodor Nicuşor Sas, Maria Iancău, Carmen LuminiŢa Mocanu
AIM: Posterior vitreous detachment (PVD) is a physiological phenomenon due to aging characterized by separation of the vitreous cortex from the retina and may induce a variety of pathological events at the vitreoretinal junction. The aim of this study is to highlight in vivo anatomical and functional changes in early stages of PVD allowing the correct treatment. MATERIAL AND METHODS: Non-consecutive case series; optical coherence tomography (OCT) relies on analyzing the reflectivity of coherent light from different anatomical interfaces within posterior vitreous and retinal histological layers, thus acquiring transverse sections through vitreoretinal interface, sensory retina, retinal pigment epithelium and choroid...
2016: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/27832267/optical-coherence-tomography-of-retinal-lesions-in-infants-with-congenital-zika-syndrome
#7
Camila V Ventura, Liana O Ventura, Vasco Bravo-Filho, Thayze T Martins, Audina M Berrocal, Adriana L Gois, João Rafael de Oliveira Dias, Leandro Araújo, Paulo Escarião, Vanessa van der Linden, Rubens Belfort, Mauricio Maia
Importance: Zika virus (ZIKV) can cause severe changes in the retina and choroid that may result in marked visual impairment in infants with congenital Zika syndrome (CZS), the term created for a variety of anomalies associated with intrauterine ZIKV infection. Objective: To evaluate the affected retinal layers in infants with CZS and associated retinal abnormalities using optical coherence tomography (OCT). Design, Setting, and Participants: This cross-sectional, consecutive case series included 8 infants (age range, 3...
November 10, 2016: JAMA Ophthalmology
https://www.readbyqxmd.com/read/27820422/the-relation-of-white-on-white-standard-automated-perimetry-short-wavelength-perimetry-and-optic-coherence-tomography-parameters-in-ocular-hypertension
#8
Ceyda Başkan, Özlem G Köz, Rahmi Duman, Sabite E Gökçe, Ahmet A Yarangümeli, Gülcan Kural
PURPOSE: The purpose of this study is to examine the demographics, clinical properties, and the relation between white-on-white standard automated perimetry (SAP), short wavelength automated perimetry (SWAP), and optical coherence tomographic (OCT) parameters of patients with ocular hypertension. MATERIALS AND METHODS: Sixty-one eyes of 61 patients diagnosed with ocular hypertension in the Ankara Numune Education and Research Hospital ophthalmology unit between January 2010 and January 2011 were included in this study...
December 2016: Journal of Glaucoma
https://www.readbyqxmd.com/read/27813526/comparison-of-indocyanine-green-angiography-and-optical-coherence-tomographic-angiography-in-polypoidal-choroidal-vasculopathy
#9
K Takayama, Y Ito, H Kaneko, K Kataoka, T Sugita, R Maruko, K Hattori, E Ra, F Haga, H Terasaki
PurposeTo compare optical coherence tomographic angiography (OCTA) and indocyanine green angiography (ICGA) images for detecting polypoidal lesions (PLs) and branching vascular networks (BVNs), and to measure the polypoidal areas (PAs) in patients with polypoidal choroidal vasculopathy (PCV).MethodsAll patients underwent ICGA, optical coherence tomography (OCT), and OCTA. We compared the detection sensitivity for PL and BVN, as evaluated by the ICGA and OCTA images. Furthermore, PA measured by ICGA was divided into two groups: one in which the area could be measured by OCTA (ICGA(+)OCTA(+)) and the other in which the area could not be measured by OCTA (ICGA(+)OCTA(-))...
November 4, 2016: Eye
https://www.readbyqxmd.com/read/27811337/patients-with-multiple-sclerosis-demonstrate-reduced-subbasal-corneal-nerve-fibre-density
#10
Janine Mikolajczak, Hanna Zimmermann, Ahmad Kheirkhah, Ella Maria Kadas, Timm Oberwahrenbrock, Rodrigo Muller, Aiai Ren, Joseph Kuchling, Holger Dietze, Harald Prüss, Friedemann Paul, Pedram Hamrah, Alexander U Brandt
BACKGROUND: Many studies in multiple sclerosis (MS) have investigated the retina. Little, however, is known about the effect of MS on the cornea, which is innervated by the trigeminal nerve. It is the site of neural-immune interaction with local dendritic cells reacting in response to environmental stimuli. OBJECTIVE: This study aims to investigate the effect of MS on corneal nerve fibres and dendritic cells in the subbasal nerve plexus using in vivo confocal microscopy (IVCM)...
November 3, 2016: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/27789225/progress-in-anterior-chamber-angle-imaging-for-glaucoma-risk-prediction-a-review-on-clinical-equipment-practice-and-research
#11
REVIEW
Shinoj V K, Xun Jie Jeesmond Hong, Murukeshan V M, Baskaran M, Aung Tin
The visualization capabilities of various ocular imaging instruments can generally be categorized into photographic (e.g. gonioscopy, Pentacam, RetCam) and optical tomographic (e.g. optical coherence tomography (OCT), photoacoustic (PA) imaging, ultrasound biomicriscopy (UBM)) methods. These imaging instruments allow vision researchers and clinicians to visualize the iridocorneal angle, and are essential in the diagnosis and management of glaucoma. Each of these imaging modalities has particular benefits and associated drawbacks in obtaining repeatable and reliable measurement in the evaluation of the angle...
October 24, 2016: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27779556/multimodal-imaging-of-serpiginous-choroiditis
#12
Hashim Ali Khan, Muhammad Aamir Shahzad
PURPOSE: To report a case of atypical serpiginous choroiditis with previously unreported findings on optical coherence tomographic angiography. CASE REPORT: A 35-year-old otherwise healthy man had a 1-week history of vision loss in his right eye. The visual acuity in right eye was counting fingers at 1 meter. Fundoscopy showed a classic peripapillary serpiginous lesion and a solitary macular lesion. Fundus fluorescein angiography revealed early hypofluorescence of active lesions with gradual increase in fluorescence across the phase of angiogram...
October 25, 2016: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/27775513/smoothing-splines-on-unit-ball-domains-with-application-to-corneal-topography
#13
Ram Iyer, Farzana Nasrin, Elton See, Steven Mathews
Optical coherence tomography (OCT) is a non-invasive imaging technique used to study and understand internal structures of biological tissues such as the anterior chamber of the human eye. An interesting problem is the reconstruction of the shape of the biological tissue from OCT images, that is not only a good fit of the data but also respects the smoothness properties observed in the images. A similar problem arises in Magnetic Resonance Imaging (MRI). We cast the problem as a penalized weighted least squares regression with a penalty on the magnitude of the second derivative (Laplacian) of the surface...
October 19, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/27768369/coherence-constraints-and-the-last-hidden-optical-coherence
#14
Xiao-Feng Qian, Tanya Malhotra, A Nick Vamivakas, Joseph H Eberly
We have discovered a new domain of optical coherence, and show that it is the third and last member of a previously unreported fundamental triad of coherences. These are unified by our derivation of a parallel triad of coherence constraints that take the form of complementarity relations. We have been able to enter this new coherence domain experimentally and we describe the novel tomographic approach devised for that purpose.
October 7, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27762314/aberration-free-volumetric-high-speed-imaging-of-in-vivo-retina
#15
Dierck Hillmann, Hendrik Spahr, Carola Hain, Helge Sudkamp, Gesa Franke, Clara Pfäffle, Christian Winter, Gereon Hüttmann
Certain topics in research and advancements in medical diagnostics may benefit from improved temporal and spatial resolution during non-invasive optical imaging of living tissue. However, so far no imaging technique can generate entirely diffraction-limited tomographic volumes with a single data acquisition, if the target moves or changes rapidly, such as the human retina. Additionally, the presence of aberrations may represent further difficulties. We show that a simple interferometric setup-based on parallelized optical coherence tomography-acquires volumetric data with 10 billion voxels per second, exceeding previous imaging speeds by an order of magnitude...
October 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27749794/can-peripheral-optical-coherence-tomography-b-scans-influence-the-surgeon-s-decision-on-episcleral-surgery
#16
Micol Alkabes, Domenico Massaro, Stefano Ranno, Paolo Nucci
PURPOSE: To describe the case of a young boy affected by a rhegmatogenous retinal redetachment in whom the use of peripheral optical coherence tomography led the vitreoretinal surgeon to treat the patient with an additional surgery instead of a "watchful waiting" strategy. METHODS: A 13-year-old boy was referred to the Vitreoretinal Department of the study institution affected by a macula-off rhegmatogenous retinal redetachment in his right eye secondary to a second blunt trauma...
October 3, 2016: Retinal Cases & Brief Reports
https://www.readbyqxmd.com/read/27749698/volume-rendered-angiographic-and-structural-optical-coherence-tomography-angiography-of-macular-telangiectasia-type-2
#17
Richard F Spaide, Mihoko Suzuki, Lawrence A Yannuzzi, Alexandre Matet, Francine Behar-Cohen
PURPOSE: To evaluate multimodal imaging including volume-rendered angiographic and structural optical coherence tomography of macular telangiectasia Type 2 (MacTel2) for right-angle vein complexes, macular cavitations, and signs of deeper retinal vascular invasion. METHODS: Retrospective review of imaging performed in a community-based retinal referral center. The eyes were scanned using optical coherence tomography using split-spectrum amplitude-decorrelation techniques to derive flow information...
September 30, 2016: Retina
https://www.readbyqxmd.com/read/27749694/tomographic-relationships-between-retinal-neovascularization-and-the-posterior-vitreous-in-proliferative-diabetic-retinopathy
#18
Sara Vaz-Pereira, Kunal K Dansingani, Kevin C Chen, Michael J Cooney, James M Klancnik, Michael Engelbert
PURPOSE: To describe anatomical relationships of retinal neovascular complexes (NVCs) and the posterior vitreous in proliferative diabetic retinopathy using spectral domain optical coherence tomography. METHODS: Cross-sectional study. Neovascular complexes were imaged using spectral domain optical coherence tomography in 51 eyes of 37 patients. The relationship of NVCs to the posterior vitreous cortex and posterior vitreous spaces, such as the premacular bursa, prevascular vitreous fissures, and perimacular cisterns, was analyzed...
September 30, 2016: Retina
https://www.readbyqxmd.com/read/27736947/choroidal-structure-in-children-with-anisohypermetropic-amblyopia-determined-by-binarization-of-optical-coherence-tomographic-images
#19
Tomo Nishi, Tetsuo Ueda, Yuutaro Mizusawa, Kayo Shinomiya, Kentaro Semba, Yoshinori Mitamura, Shozo Sonoda, Eisuke Uchino, Taiji Sakamoto, Nahoko Ogata
PURPOSE: To compare the choroidal structure of the subfoveal area in the eyes of children with anisohypermetropic amblyopia to that of the fellow eyes and to age-matched controls using a binarization method of the images obtained by enhanced depth imaging optical coherence tomography (EDI-OCT). METHODS: This study was performed at Nara Medical University Hospital, Tokushima University Hospital, and Kagoshima University Hospital, Japan. Forty amblyopic eyes with anisohypermetropic amblyopia and their fellow eyes (5...
2016: PloS One
https://www.readbyqxmd.com/read/27711925/peripapillary-capillary-dilation-in-leber-hereditary-optic-neuropathy-revealed-by-optical-coherence-tomographic-angiography
#20
Eric D Gaier, John W Gittinger, Dean M Cestari, John B Miller
No abstract text is available yet for this article.
October 6, 2016: JAMA Ophthalmology
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