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optical coherence tomograph

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
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
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
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
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
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
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
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
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
Quraish Ghadiali, Anna Tan, K Bailey Freund
PURPOSE: We describe a patient with an unusually posterior varix of a vortex vein ampulla. METHODS: Case report. RESULTS: An unusually posterior varix of a vortex vein ampulla mimicking a choroidal neoplasm was identified. The diagnosis was obscured by the presence of overlying drusen. Through a combination of indocyanine green angiography and enhanced depth imaging optical coherence tomography, the varix was identified as an engorged vascular process correlating to ophthalmoscopic and tomographic examination...
August 23, 2016: Retinal Cases & Brief Reports
Ahmed Chebil, Salma Touati, Rym Maamouri, Fedra Kort, Leila El Matri
Background Maculopathy is a common complication of retinitis pigmentosa (RP), and compromise the visual acuity of RP patients even in the less advanced stages. Aim To report the morphological macular findings detected by spectral domain optical coherence tomography (SD-OCT) and to determine their prevalence in patients with retinitis pigmentosa (RP). Methods  SD-OCT scans from 100 patients (196 eyes) affected by RP were reviewed. Results We noted a normal macula appearance in 48.5%, macular edema in 14.5% and macular atrophy in 37%...
April 2016: La Tunisie Médicale
Josep Gomez-Lara, Salvatore Brugaletta, Francisco Jacobi, Luis Ortega-Paz, Marcos Ñato, Gerard Roura, Rafael Romaguera, Jose-Luis Ferreiro, Luis Teruel, Montserrat Gracida, Victoria Martin-Yuste, Xavier Freixa, Monica Masotti, Joan-Antoni Gomez-Hospital, Manel Sabate, Angel Cequier
BACKGROUND: The main causes of late (>1 month) stent thrombosis (ST) are stent uncoverage, malapposition, and neoatherosclerosis. First-generation drug-eluting stents were associated with higher rate of late ST compared with bare-metal stents (BMS), especially in patients with ST-segment-elevation myocardial infarction. Second-generation everolimus-eluting stents (EES) have shown similar rate of late ST than BMS. The aims of the study are to compare the ratio of uncovered to total struts per cross-section ≥30% and other optical coherence tomographic findings associated with ST between EES and BMS in patients with ST-segment-elevation myocardial infarction at 5 years...
October 2016: Circulation. Cardiovascular Interventions
Yesim Haeussler-Sinangin, Tim Schultz, Eva Holtmann, H Burkhard Dick
PURPOSE: To evaluate whether the size of Berger space is safely predictable in patients having cataract surgery using 3-dimensional spectral-domain optical coherence tomographic (3-D SD-OCT) image analysis. SETTING: Ruhr University Eye Hospital, Bochum, Germany. DESIGN: Prospective interventional case series. METHODS: Eyes having routine femtosecond laser-assisted cataract surgery were included. After wound closure, the anterior eye segment was visualized using the incorporated 3-D SD-OCT...
September 2016: Journal of Cataract and Refractive Surgery
Kazuyuki Kumagai, Masanori Hangai, Mariko Furukawa, Tetsuyuki Suetsugu, Nobuchika Ogino
OBJECTIVE: To investigate the effects of vitreomacular adhesion (VMA), vitreomacular separation (VMS) and absence of vitreous gel due to vitrectomy on macular thickness measured in the spectral domain optical coherence tomographic (SD-OCT) images. DESIGN: A longitudinal, retrospective, observational study. SETTING: Secondary multicentre study. PARTICIPANTS: 218 eyes of 218 healthy patients and 119 vitrectomised eyes of 119 patients were studied...
September 30, 2016: BMJ Open
Aristomenis Thanos, Lisa J Faia, Yoshihiro Yonekawa, Sandeep Randhawa
Importance: Acute macular neuroretinopathy (AMN) is a rare, yet increasingly recognized, entity identified predominantly in young healthy females with acute onset of paracentral scotomas. The exact pathophysiology is unknown but an underlying vascular process is suspected. This study used optical coherence tomographic angiography (OCTA) to assess for any evidence of vascular flow abnormality in the retina or choroid in this elusive disease. Observations: Three eyes from 2 young female patients with classic features of AMN are presented...
September 29, 2016: JAMA Ophthalmology
Paolo Milani, Amedeo Massacesi, Stefania Moschini, Marco Setaccioli, Ennio Bulone, Gemma Tremolada, Stefano Ciaccia, Elena Mantovani, Daniela Morale, Fulvio Bergamini
PURPOSE: To investigate myopic choroidal neovascularization (mCNV) by fluorescein angiography (FA), spectral-domain optical coherence tomography (SD-OCT), near-infrared (NIR) reflectance, and autofluorescence (AF). METHODS: This retrospective study included 65 eyes of 62 Caucasian patients with a mean age of 66.72 years (95% confidence interval [CI] 63-70 years) and a mean refraction of -9.72 diopters (95% CI -8.74 to -10.70 diopters). RESULTS: Most of the mCNV cases were foveal-juxtafoveal (60/65, 92...
2016: Clinical Ophthalmology
K Santhirasegaram, K Wehrmann, N Feucht, C P Lohmann, M Maier
: The case report of a 35-year-old woman suffering from Hippel-Lindau syndrome (VHL) with retinal hemangiomas is presented. The patient developed macular edema with loss of vision and metamorphopsia. Laser treatment of hemangiomas improved the clinical picture. Hemangiomas were visualized using fluorescein angiography and optical coherence angiography. To our knowledge we describe retinal hemangiomas in VHL disease with the optical coherence tomographical angiography (OCTA) for the first time...
September 26, 2016: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
Akira Hagiwara, Takayuki Baba, Tomoaki Tatsumi, Eiju Sato, Toshiyuki Oshitari, Shuichi Yamamoto
PURPOSE: To determine the relationship between preoperative and postoperative characteristics and visual outcomes after successful surgery for unclosed macular hole (MH). METHODS: The medical charts of 166 eyes of 161 patients who underwent vitrectomy for a MH were reviewed. The MH was not closed in 9 eyes of 9 patients after the initial surgery. The second vitrectomy with additional internal limiting membrane (ILM) peeling and gas tamponade was performed. The preoperative and postoperative best-corrected visual acuity (BCVA), optical coherence tomographic images, MH size, duration of MH before the first operation, and area of ILM peeling were studied...
September 9, 2016: European Journal of Ophthalmology
Takamasa Kinoshita, Yoshinori Mitamura, Terumi Mori, Kei Akaiwa, Kentaro Semba, Mariko Egawa, Junya Mori, Shozo Sonoda, Taiji Sakamoto
PURPOSE: To determine the structural changes in the choroid after half-dose photodynamic therapy (hPDT) in eyes with chronic central serous chorioretinopathy (CSC). METHODS: This was a retrospective interventional study of 29 eyes of 29 patients who underwent hPDT for chronic CSC with serous retinal detachment (SRD) and were followed for ≥3 months. Enhanced depth imaging optical coherence tomographic (EDI-OCT) images of the subfoveal choroid were converted to binary images...
2016: PloS One
Nandan Kumar Das, Sabyasachi Mukhopadhyay, Nirmalya Ghosh, Jay Chhablani, Ashutosh Richhariya, Kompalli Divakar Rao, Naba Kishore Sahoo
No abstract text is available yet for this article.
September 1, 2016: Journal of Biomedical Optics
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