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287 results on '"Optical tomography -- Methods"'

204. Investigators at Hamamatsu University School of Medicine Report Findings in Applied Sciences (A Hybrid Inversion Scheme Combining Markov Chain Monte Carlo and Iterative Methods for Determining Optical Properties of Random Media)

Subjects
Usage, Measurement, Methods, Monte Carlo methods -- Usage, Markov processes -- Usage, Optical tomography -- Methods, Light scattering -- Measurement, Infrared spectroscopy -- Methods, Algorithms, Spectroscopy, Tomography, Editors
Abstract

2019 NOV 1 (NewsRx) -- By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Science - Applied Sciences. According to news reporting from Shizuoka, [...]

Published
2019

205. Data on Applied Sciences Discussed by Researchers at Medical University of Vienna (Ultrahigh Resolution Polarization Sensitive Optical Coherence Tomography of the Human Cornea with Conical Scanning Pattern and Variable Dispersion Compensation)

Subjects
Physiological aspects, Methods, Cornea -- Physiological aspects, Optical tomography -- Methods, Tomography, Editors
Abstract

2019 NOV 1 (NewsRx) -- By a News Reporter-Staff News Editor at Science Letter -- Fresh data on applied sciences are presented in a new report. According to news reporting [...]

Published
2019

206. New Findings from University of Miami Miller School of Medicine Yields New Data on Age-Related Macular Degeneration (Lessons Learned From Avastin and OCT-The Great, the Good, the Bad, and the Ugly: The LXXV Edward Jackson Memorial Lecture)

Subjects
Testing, Diagnosis, Drug therapy, Methods, Macular degeneration -- Diagnosis -- Drug therapy, Bevacizumab -- Testing, Optical tomography -- Methods, Vascular endothelial growth factor, Eye diseases, Angiogenesis inhibitors, Endothelial growth factors, Medical research, Tomography, Ranibizumab, Endothelium, Retirement benefits, Editors, Blindness
Abstract

2019 AUG 6 (NewsRx) -- By a News Reporter-Staff News Editor at World Disease Weekly -- Current study results on Eye Diseases and Conditions - Age-Related Macular Degeneration have been [...]

Published
2019

207. HOW TO IDENTIFY FUNCTIONAL DEFICITS BEFORE NOTING STRUCTURAL CHANGE

Subjects
Diagnosis, Development and progression, Complications and side effects, Methods, Physiological aspects, Medical examination, Macular degeneration -- Diagnosis -- Development and progression -- Complications and side effects, Optical tomography -- Methods, Rods (Photoreceptors) -- Physiological aspects -- Medical examination, Tomography, Retinal diseases, Technology
Abstract

Many cases of AMD are overlooked based on the absence of structural findings using advanced technology.For example, ocular coherence tomography (OCT) is essential for detecting and managing many retinal diseases, [...]

Published
2018

208. Why microscope-integrated OCT is vital to gene therapy applications: Confirming subretinal injection as opposed to suprachoroidal or sub-RPE injection is crucial

Author

Dalton, Michelle

Subjects
Genetic aspects, Patient outcomes, Methods, Gene therapy -- Patient outcomes, Retinal pigment epithelium -- Genetic aspects, Optical tomography -- Methods
Abstract

INTRAOPERATIVE OPTICAL coherence tomography (OCT) allows surgeons to visualize retinal anatomy and provides the surgeon with real-time feedback on instrument-tissue interaction. Intraoperative microscope-integrated OCT can serve as confirmation for the [...]

Published
2018

209. Criteria helpful in defining DME treatment failure: Assessment may be best judged by persistence of macular edema identified with OCT

Author

Krader, Cheryl Guttman

Subjects
Care and treatment, Development and progression, Methods, Diabetic retinopathy -- Development and progression -- Care and treatment, Optical tomography -- Methods, Cystoid macular edema -- Development and progression -- Care and treatment
Abstract

Because diabetes is a growing epidemic, retina specialists can expect to treat more patients for diabetic macular edema (DME) in the future. Pharmacotherapy with antivascular endothelial growth factor (VEGF) agents [...]

Published
2018

214. Retinal Thickness Measurements From Optical Coherence Tomography Using a Markov Boundary Model

Author

Koozekanani, Dara, Boyer, Kim, and Roberts, Cynthia

Subjects
Retina, Optical tomography -- Methods, Markov processes -- Models, Ophthalmology -- Research, Business, Electronics, Electronics and electrical industries, Health care industry
Abstract

We present a system for detecting retinal boundaries in optical coherence tomography (OCT) B-scans. OCT is a relatively new imaging modality giving cross-sectional images that are qualitatively similar to ultrasound. However, the axial resolution with OCT is much higher, on the order of 10 [micro]m. Objective, quantitative measures of retinal thickness may be made from OCT images. Knowledge of retinal thickness is important in the evaluation and treatment of many ocular diseases. The boundary-detection system presented here uses a one-dimensional edge-detection kernel to yield edge primitives. These edge primitives are rated, selected, and organized to form a coherent boundary structure by use of a Markov model of retinal boundaries as detected by OCT. Qualitatively, the boundaries detected by the automated system generally agreed extremely well with the true retinal structure for the vast majority of OCT images. Only one of the 1450 evaluation images caused the algorithm to fail. A quantitative evaluation of the retinal boundaries was performed as well, using the clinical application of automatic retinal thickness determination. Retinal thickness measurements derived from the algorithm's results were compared with thickness measurements from manually corrected boundaries for 1450 test images. The algorithm's thickness measurements over a 1-mm region near the fovea differed from the corrected thickness measurements by less than 10 [micro]m for 74% of the images and by less than 25 [micro]m (10% of normal retinal thickness) for 98.4% of the images. These errors are near the machine's resolution limit and still well below clinical significance. Current, standard clinical practice involves a qualitative, visual assessment of retinal thickness. A robust, quantitatively accurate system such as ours can be expected to improve patient care. Index Terms--Boundary detection, edge detection, Markov models, ophthalmology, optical coherence tomography, perceptual organization, retina.

Published
2001

215. Reflective tomography reconstruction of satellite features--field results

Author

Matson, Charles L. and Mosley, Debora E.

Subjects
Optical radar -- Testing, Optical tomography -- Methods, Astronomy, Physics
Abstract

We report on the first satellite feature reconstruction, to our knowledge, by use of range-resolved reflective tomography techniques from nonimaging laser radar data collected on an orbiting satellite. The reconstructed features were two retroreflectors mounted on a satellite. The data were collected with a coherent laser radar system located at the Maui Space Surveillance Site in Maui, Hawaii. We utilized a filtered backpropagation algorithm to reconstruct the images using intensity projections created from the raw data. Key components of the image reconstruction process included the calculation of tomographic angles, the alignment of the intensity projections to an appropriate center of rotation, and compensation for the lack of data for a full 360 [degrees] set of views. [C] 2001 Optical Society of America OCIS codes: 110.6960, 280.3640.

Published
2001

217. Evaluation of the Adaptive Speckle Suppression Filter for Coronary Optical Coherence Tomography Imaging

Author

Rogowska, Jadwiga and Brezinski, Mark E.

Subjects
Medical imaging equipment -- Usage, Optical tomography -- Methods, Filters (Mathematics) -- Evaluation, Coronary arteries, Business, Electronics, Electronics and electrical industries, Health care industry
Abstract

During the last few years, optical coherence tomography (OCT) has demonstrated considerable promise as a method of high-resolution intravascular imaging. The goal of this study was to apply and to test the applicability of the rotating kernel transformation (RKT) technique to the speckle reduction and enhancement of OCT images. The technique is locally adaptive. It is based on sequential application of directional masks and selection of the maximum of all outputs. This method enhances the image features by emphasizing thin edges while suppressing a noisy background. Qualitatively, the RKT algorithm provides noticeable improvement over the original image. All processed images are smoother and have better-defined borders of media, intima, and plaque. The quantitative evaluation of RKT performance showed that in terms of average contrast-to-noise ratio, there is a significant improvement in image quality between original and enhanced images. The RKT image enhancement technique shows great promise in improving OCT images for superior boundary identification. Index Terms--Coronary plaque, image speckle, optical coherence tomography, rotating kernel transformation technique.

Published
2000

218. Depth-resolved two-dimensional Stokes vectors of backscattered light and Mueller matrices of biological tissue measured with optical coherence tomography

Author

Jiao, Shuliang, Yao, Gang, and Wang, Lihong V.

Subjects
Matrices -- Research, Polarization (Light) -- Measurement, Tissue culture -- Research, Optics -- Research, Backscattering -- Measurement, Optical tomography -- Methods, Astronomy, Physics
Abstract

Mueller matrices provide a complete characterization of the optical polarization properties of biological tissue. A polarization-sensitive optical coherence tomography (OCT) system was built and used to investigate the optical polarization properties of biological tissues and other turbid media. The apparent degree of polarization (DOP) of the backscattered light was measured with both liquid and solid scattering samples. The DOP maintains the value of unity within the detectable depth for the solid sample, whereas the DOP decreases with the optical depth for the liquid sample. Two-dimensional depth-resolved images of both the Stokes vectors of the backscattered light and the full Mueller matrices of biological tissue were measured with this system. These polarization measurements revealed some tissue structures that are not perceptible with standard OCT. [C] 2000 Optical Society of America OCIS codes: 120.2130, 170.4500, 260.5430, 290.7050.

Published
2000

220. Authors' reply

Author

Moura, Frederico and Monteiro, MáRio

Subjects
Diagnosis, Care and treatment, Properties, Methods, Neurofibrils -- Properties, Optic nerve -- Properties, Optical tomography -- Methods, Eye diseases -- Diagnosis -- Care and treatment
Published
2010

221. Evaluation of retinal nerve fiber layer thickness measurements using optical coherence tomography in patients with tobacco-alcohol-induced toxic optic neuropathy

Author

Ramchandani, Suresh, Ramchandani, Sushama, and Ahuja, Indrajyotkaur

Subjects
Diagnosis, Care and treatment, Research, Properties, Methods, Neurofibrils -- Properties, Optic nerve -- Properties, Optical tomography -- Methods, Ophthalmology -- Analysis -- Research, Eye diseases -- Diagnosis -- Care and treatment
Published
2010

222. Authors' reply

Author

Gupta, Vishali, Gupta, Amod, and Gupta, Pawan

Subjects
Diagnosis, Care and treatment, Methods, Fluorescein angiography -- Methods, Retinal diseases -- Diagnosis -- Care and treatment, Optical tomography -- Methods, Fluorescence angiography -- Methods
Published
2010

225. Technologic advances integrate OCT into real-time surgeries: three devices in DISCOVER study show benefit of integrated approach, but barriers remain

Author

Dalton, Michelle

Subjects
Physiological aspects, Innovations, Methods, Retina -- Physiological aspects, Eye surgery -- Innovations, Optical tomography -- Methods
Abstract

CLEVELAND :: MICROSCOPE INTEGRATED intraoperative optical coherence tomography (iOCT) can confirm that surgical objectives of various retina surgeries have been met, said Justis P. Ehlers, MD. Dr. Ehlers and colleagues [...]

Published
2015

226. Early treatment, prevention key to postsurgical CME cases: careful OCT evaluation; topical steroid and NSAID therapy among strategies

Author

Gebhart, Fred

Subjects
Care and treatment, Dosage and administration, Methods, Nonsteroidal anti-inflammatory agents -- Dosage and administration, Optical tomography -- Methods, Cataract extraction -- Methods, Cystoid macular edema -- Care and treatment, Nonsteroidal anti-inflammatory drugs -- Dosage and administration, Eye diseases -- Care and treatment, Cataract -- Surgery
Abstract

OVERLAND PARK, KS :: CYSTOID MACULAR EDEMA (CME) remains a significant clinical issue following uncomplicated cataract surgery. CME affects about 1% of patients--10 to 25 times the incidence of postoperative [...]

Published
2015

227. Pick your poison

Author

Dunbar, Mark T.

Subjects
Drug therapy, Complications and side effects, Development and progression, Methods, Chemotherapy -- Complications and side effects, Optical tomography -- Methods, Vision disorders -- Development and progression -- Drug therapy, Cancer -- Chemotherapy
Abstract

Life-saving drugs can have detrimental effects. Are you aware of which medicines can complicate vision? A 64-year-old Hispanic female presented with complaints of blurred vision in both eyes for approximately [...]

Published
2015

228. Optic pallor prompts VEP test: when the visual field and SD-OCT were normal, VEP helped solve the mystery of a patient's optic nerve pallor

Author

Trottini, Michael and DelGiodice, Michael

Subjects
Diagnosis, Care and treatment, Measurement, Methods, Optical tomography -- Methods, Visual evoked potentials -- Measurement, Refractive errors -- Diagnosis -- Care and treatment, Eye -- Refractive errors, Visual evoked response -- Measurement
Abstract

A 40-year-old white male presented for a LASIK evaluation with a complaint of blurry distance vision related to myopia in both eyes. His medical and ocular histories were unremarkable and [...]

Published
2015

229. This Year's Model: Technology advances by leaps and bounds but your responsibility remains the same

Author

Persico, Jack

Subjects
Management, Diagnosis, Methods, Company business management, Ophthalmological tests -- Methods -- Management, Medical technology -- Management, Optical tomography -- Methods, Glaucoma -- Diagnosis
Abstract

Walking the exhibit floor at the recent SECO conference, I was struck again by how revolutionary optometric technology has become, especially in glaucoma. A colleague and I stopped to watch [...]

Published
2018

230. Findings from Justus-Liebig-University in the Area of Optical Coherence Tomography Described (Structure-Function Correlation in Hemianopic Vision Loss in Children Aged 3-6 Years Using OCT and SVOP, and Comparison with Adult Eyes)

Subjects
Development and progression, Diagnosis, Medical examination, Physiological aspects, Methods, Hemianopsia -- Development and progression -- Diagnosis, Visual fields -- Medical examination -- Physiological aspects, Eye examination -- Methods, Optical tomography -- Methods, Perimetry -- Methods, Pediatric diseases -- Development and progression -- Diagnosis
Abstract

2018 DEC 28 (NewsRx) -- By a News Reporter-Staff News Editor at Health & Medicine Week -- Research findings on Optical Coherence Tomography are discussed in a new report. According [...]

Published
2018

231. Combining images, not codes: with new OCT technology comes new coding do's and don'ts

Author

Rumpakis, John

Subjects
Evaluation, Methods, Practice guidelines (Medicine) -- Evaluation, Optical tomography -- Methods
Abstract

OCT is quickly becoming an integral part of optometric practice. From a coding standpoint, OCT was first introduced in 1999 with code 92135, scanning computerized ophthalmic diagnostic imaging (e.g., scanning [...]

Published
2017

232. 3D carnivorous plants

Subjects
Biologists -- Interviews, Carnivorous plants -- Genetic aspects, Optical tomography -- Methods, Growth (Plants) -- Genetic aspects, Science and technology
Abstract

Prominent molecular biologist Enrico Coen has discovered multiple classes of regulatory genes that are vital to the evolution and development of flowers. His research, team--based at the John Innes Centre [...]

Published
2013

234. Beyond retinal nerve fiber layer loss: what optical imaging can reveal: advances in technology have helped answer numerous questions, while raising new queries

Author

Dalton, Michelle

Subjects
Medical examination, Methods, Retina -- Medical examination, Optical tomography -- Methods
Abstract

NEW YORK :: These days, it is commonplace to use optical coherence tomography (OCT) to measure retinal nerve fiber layer (RNFL) thinning with optic nerve injury, due to glaucoma, optic [...]

Published
2015

235. Optical coherence tomography tracks glaucoma progression: improved, noninvasive device quickly shows cross-section, measures nerve fiber layer thickness. (Technology still new)

Author

Scerra, Chet

Subjects
Diagnosis, Development and progression, Methods, Optical tomography -- Methods, Glaucoma -- Development and progression -- Diagnosis
Abstract

Reviewed by Joel S. Schuman, MD Orlando--Optical coherence tomography (OCT, Carl Zeiss Meditec) offers superior sensitivity and specificity in detecting glaucoma and its progression, according to Boston glaucoma specialist Joel [...]

Published
2003

236. Study: role of fellow eye in AMD therapy: monthly OCT monitoring necessary for early detection, prompt treatment to maximize outcomes

Author

Dalton, Michelle

Subjects
Diagnosis, Standards, Methods, Macular degeneration -- Research -- Diagnosis, Patient care -- Standards, Optical tomography -- Methods, Patients -- Care and treatment
Abstract

SECOND EYES WITH neovascular age-related macular degeneration (AMD) typically start treatment with better baseline visual acuity. However, they do not show significant vision gain but maintain better mean visual acuity [...]

Published
2014

237. Vitrectomy, OCT imaging aid managing of refractory CSDME: visual improvement now possible in eyes that previously had little chance of good outcome. (Approaches evolving)

Author

Hassan, Tarek S. and Ho, Allen C.

Subjects
Care and treatment, Methods, Macular degeneration -- Care and treatment, Diabetic retinopathy -- Care and treatment, Optical tomography -- Methods, Vitrectomy -- Methods
Abstract

The management of diffuse clinically significant diabetic macular edema (CSDME) refractory to conventional laser treatment is a complex and often frustrating part of daily clinical practice. Focal CSDME from discrete, [...]

Published
2002

238. Progressive Change of Optical Coherence Tomography Scans in Retinal Degeneration Slow Mice

Author

Horio, Naoichi, Kachi, Syu, Hori, Kenji, Okamoto, Yoko, Yamamoto, Etsuko, Terasaki, Hiroko, and Miyahe, Yozo

Subjects
Retinal degeneration -- Diagnosis, Optical tomography -- Methods, Health
Abstract

Objective: To study whether optical coherence tomography (OCT) scans correlate retinal histologic findings with the progression of retinal degeneration in retinal degeneration slow (rds) mice. Methods: Sensory retinal thickness (SRT) and outer retinal thickness (ORT), representing photoreceptor cell layer, in temporal retina at a distance 1 to 2 disc diameters from the optic disc were measured using scan profile in OCT from 6 healthy mice (16 weeks old) and 2-week-old (n=6), 6-week-old (n=4), and 60-week-old (n=2) rds mice. Histologic sections were obtained from Epon-embedded retinas from the corresponding location. Results: Cross-sectional OCT images correlated to the corresponding histologic sections in each mouse. Both SRT and ORT of 2-week-old rds mice (150 [+ or -] 4 [micro]m and 28 [+ or -] 4 [micro]m, respectively) lacking photoreceptor outer segments were already shorter than those of healthy mice (174 [+ or -] 5 [micro]m and 37 [+ or -] 6 [micro]m, respectively) (P [is less than] .001). In 6-week-old mice, microscopic findings revealed a decreased number of nuclei in the outer nuclear layer, and SRT and ORT (136 [+ or -] 2 [micro]m and 20 [+ or -] 1 [micro]m, respectively) were shorter than those of 2-week-old rds mice (P [is less than] .001). The SRT of 60-week-old rds mice without a photoreceptor layer was remarkably reduced (120 [+ or -] 7 [micro]m), and no ORT could be measured. Conclusion: Our findings suggest a possible relationship between SRT and ORT, as measured by OCT, and histologic change in retinal degenerative diseases. Clinical Relevance: The quantitative analysis obtained by OCT scans may have potential to detect progressive change in degenerative retina and may be used in studying human retinal degeneration. Arch Ophthalmol. 2001;119:1329-1332

Published
2001

239. Anterior segment imaging: identifying the landmarks

Author

Nolan, Winifred

Subjects
Optical tomography -- Methods, Optical tomography -- Usage, Anterior chamber (Eye) -- Analysis, Angle-closure glaucoma -- Diagnosis, Angle-closure glaucoma -- Risk factors, Diagnostic imaging -- Methods, Health
Published
2008

241. iOCT: next paradigm shift for vitreoretinal surgery? Technology eases visualization; gives immediate feedback on completion of objectives

Author

Krader, Cheryl Guttman

Subjects
Innovations, Methods, Eye surgery -- Innovations, Optical tomography -- Methods, Eye -- Surgery
Abstract

CLEVELAND :: Intraoperative ocular coherence tomography (iOCT) is a useful asset when performing macular surgery and other vitreoretinal procedures. Considering the advantages it provides, iOCT may be the next paradigm [...]

Published
2016

243. The evolution of OCT: optical coherence tomography could help monitor disease progression in neurological disorders, such as MS. By Diana L. Shechtman, OD, and Paul M. Karpecki, OD

Author

Shechtman, Diana L. and Karpecki, Paul M.

Subjects
Diagnosis, Methods, Optical tomography -- Methods, Nervous system diseases -- Diagnosis
Abstract

Once viewed primarily as an instrument for observation of retinal disease, the clinical use of optical coherence tomography (OCT) has been expanded to include several novel applications in both ophthalmic [...]

Published
2014

245. OCT, angiography make retinal strides: void still exists for clinical diagnostic technologies that combine structure and function

Author

Charters, Lynda

Subjects
Diagnosis, Methods, Angiography -- Methods, Eye examination -- Methods, Retinal diseases -- Diagnosis, Optical tomography -- Methods, Eye -- Medical examination
Abstract

OPTICAL COHERENCE tomography (OCT) has seen important clinical diagnostic advances during the year and wide-field angiography is promising for the future as well. However, ophthalmologists note a gap in the [...]

Published
2013

246. How to tame a steroid response: I prescribed steroids for a patient with bilateral uveitis and central serous retinopathy--then she had an IOP increase. Now what do I do?

Author

Fanelli, James L.

Subjects
Control, Diagnosis, Drug therapy, Measurement, Methods, Health aspects, Intraocular pressure -- Measurement -- Control, Visual acuity -- Measurement, Steroids (Drugs) -- Health aspects, Retinal diseases -- Diagnosis -- Drug therapy, Optical tomography -- Methods
Abstract

A 41-year-old white female was referred for a retinal evaluation in March 2013. She complained of blurred vision OU and an achy, 'sore' feeling OS. When I first saw her, [...]

Published
2013

247. Pioneering efforts: intraoperative OCT useful tool during vitreoretinal surgery, according to new study

Author

Dalton, Michelle

Subjects
Methods, Eye surgery -- Reports -- Methods, Optical tomography -- Methods, Eye -- Surgery
Abstract

CLEVELAND Optical coherence tomography (OCT) can be successfully used during vitreoretinal surgery and can provide significant information about various milestones throughout the surgery, said Justis P. Ehlers, MD. 'Anatomic visualization [...]

Published
2013

249. MS and the retina: SD-OCT not only can be used to diagnose multiple sclerosis, but also document its progression

Author

Shechtman, Diana L. and Karpecki, Paul M.

Subjects
Diagnosis, Development and progression, Methods, Optical tomography -- Methods, Multiple sclerosis -- Development and progression -- Diagnosis
Abstract

A 43-year-old white female presented for a comprehensive eye exam. Her medical history was significant for multiple sclerosis (MS), which was diagnosed five years earlier. Her last MRI was performed [...]

Published
2013

250. A non-invasive look at trabecular meshwork: how novel OCT platform detects and measures motion, may advance glaucoma research and patient care

Author

Krader, Cheryl Guttman

Subjects
Care and treatment, Methods, Optical tomography -- Methods, Glaucoma -- Care and treatment
Abstract

SEATTLE:: Phase-sensitive optical coherence tomography (PhS-OCT) for in vivo evaluation is a promising tool for advancing glaucoma research and patient care, according to findings from a human study presented by [...]

Published
2013

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