1. Boris Považay

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    1. Mentioned In 53 Articles

    2. Time-Resolved Ultra–High Resolution Optical Coherence Tomography for Real-Time Monitoring of Selective Retina Therapy

      Explore IOVS Journal Ophthalmology
      Time-Resolved Ultra–High Resolution Optical Coherence Tomography for Real-Time Monitoring of Selective Retina Therapy
      Purpose : Selective retina therapy (SRT) is a novel treatment for retinal pathologies, solely targeting the RPE. During SRT, the detection of an immediate tissue reaction is challenging, as tissue effects remain limited to intracellular RPE photodisruption. Time-resolved ultra-high axial resolution optical coherence tomography (OCT) is thus evaluated for the monitoring of dynamic optical changes at and around the RPE during SRT. Methods : An experimental OCT system with an ultra-high axial ...
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      Mentions: Sebastian Wolf University of Bern Boris Považay

    3. Real-time optical coherence tomography observation of retinal tissue damage during laser photocoagulation therapy on ex-vivo porcine samples

      Explore Conference Proceedings Ophthalmology
      Real-time optical coherence tomography observation of retinal tissue damage during laser photocoagulation therapy on ex-vivo porcine samples
      Retinal laser photocoagulation represents a widely used treatment for retinal pathologies such as diabetic chorioretinopathy or diabetic edema. For effective treatment, an appropriate choice of the treatment energy dose is crucial to prevent excessive tissue damage caused by over-irradiation of the retina. In this manuscript we investigate simultaneous and time-resolved optical coherence tomography for its applicability to provide feedback to the ophthalmologist about the introduced retinal damage during laser photocoagulation ...
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      Mentions: University of Bern Boris Považay Christoph Meier

    4. Single-pulse CARS based multimodal nonlinear optical microscope for bioimaging

      Explore OSA | OSA Publishing
      Single-pulse CARS based multimodal nonlinear optical microscope for bioimaging
      Noninvasive label-free imaging of biological systems raises demand not only for high-speed three-dimensional prescreening of morphology over a wide-field of view but also it seeks to extract the microscopic functional and molecular details within. Capitalizing on the unique advantages brought out by different nonlinear optical effects, a multimodal nonlinear optical microscope can be a powerful tool for bioimaging. Bringing together the intensity-dependent contrast mechanismsviasecond harmonic generation, third harmonic generation and ...
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      Mentions: Wolfgang Drexler Medical University of Vienna Boris Hermann

    7. Fiber-optically integrated cost-effective spectrometer for optical coherence tomography

      Explore Conference Proceedings
      Fiber-optically integrated cost-effective spectrometer for optical coherence tomography
      A tilted fiber Bragg grating (TFBG) was integrated as the dispersive element in a high performance biomedical imaging system. The spectrum emitted by the 23 mm long active region of the fiber is projected through custom designed optics consisting of a cylindrical lens for vertical beam collimation and successively by an achromatic doublet onto a linear detector array. High resolution tomograms of biomedical samples were successfully acquired by the frequency ...
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      Mentions: Ling Wang Boris Považay Christoph Meier

    10. Cost-effective optical coherence tomography spectrometer based on a tilted fiber Bragg grating

      Explore Conference Proceedings NDE/NDT , Other Non-Medical
      Cost-effective optical coherence tomography spectrometer based on a tilted fiber Bragg grating
      A compact, fiber-based spectrometer for biomedical application utilizing a tilted fiber Bragg grating (TFBG) as integrated dispersive element is demonstrated. Based on a 45 UV-written PS750 TFBG a refractive spectrometer with 2.06 radiant/m dispersion and a numerical aperture of 0.1 was set up and tested as integrated detector for an optical coherence tomography (OCT) system. Featuring a 23 mm long active region at the fiber the spectrum ...
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      Mentions: Ling Wang Boris Považay Christoph Meier

    11. Feature Of The Week 12/1/13: Simultaneous Dual Wavelength Eye-Tracked Ultrahigh Resolution Retinal and Choroidal OCT

      Explore Optical Coherence Tomography News Ophthalmology
      Feature Of The Week 12/1/13: Simultaneous Dual Wavelength Eye-Tracked Ultrahigh Resolution Retinal and Choroidal OCT
      An eye-tracked high resolution OCT device is presented for clinical multimodal imaging of the retina and the deep choroid, based on the platform of a commercial Heidelberg-Engineering SPECTRALIS OCT device. The system is aimed to drive the development of novel therapeutic approaches for better eye care. The dual spectrometer based frequency domain OCT with built-in confocal scanning laser ophthalmoscope (SLO) operating at 735 nm, corrects for eye-motion in real time ...
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      Mentions: Wolfgang Drexler Heidelberg Engineering Exalos

    12. Simultaneous dual wavelength eye-tracked ultrahigh resolution retinal and choroidal optical coherence tomography

      Explore opticsinfobase.org Ophthalmology
      Simultaneous dual wavelength eye-tracked ultrahigh resolution retinal and choroidal optical coherence tomography
      We demonstrate an optical coherence tomography device that simultaneously combines different novel ultrabroad bandwidth light sources centered in the 800 and 1060 nm regions, operating at 66 kHz depth scan rate, and a confocal laser scanning ophthalmoscope-based eye tracker to permit motion-artifact-free, ultrahigh resolution and high contrast retinal and choroidal imaging. The two wavelengths of the device provide the complementary information needed for diagnosis of subtle retinal changes, while also ...
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      Mentions: Wolfgang Drexler Exalos Peter E. Andersen

    13. Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip

      Explore opticsinfobase.org
      Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip
      Optical coherence tomography (OCT) has enabled clinical applications that revolutionized in vivo medical diagnostics. Nevertheless, its current limitations owing to cost, size, complexity, and the need for accurate alignment must be overcome by radically novel approaches. Exploiting integrated optics, we assemble the central components of a spectral-domain OCT system on a silicon chip. The spectrometer comprises an arrayed-waveguide grating with 136-nm free spectral range and 0.21-nm wavelength resolution. The ...
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      Mentions: Wolfgang Drexler Medical University of Vienna University of Twente

    14. Advanced integrated spectrometer designs for miniaturized optical coherence tomography systems

      Explore Conference Proceedings
      Advanced integrated spectrometer designs for miniaturized optical coherence tomography systems
      Optical coherence tomography (OCT) has enabled clinical applications that revolutionized in vivo medical diagnostics. Nevertheless, its current limitations owing to cost, size, complexity, and the need for accurate alignment must be overcome by radically novel approaches. Exploiting integrated optics, the central components of a spectral-domain OCT (SD-OCT) system can be integrated on a chip. Arrayed-waveguide grating (AWG) spectrometers with their high spectral resolution and compactness are excellent candidates for on-chip ...
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      Mentions: Wolfgang Drexler Medical University of Vienna University of Twente

    15. Choroidal Thinning in Diabetes Type 1 Detected by 3-Dimensional 1060 nm Optical Coherence Tomography

      Explore iovs.org Ophthalmology
      Choroidal Thinning in Diabetes Type 1 Detected by 3-Dimensional 1060 nm Optical Coherence Tomography
      Purpose. To map choroidal (ChT) and retinal thickness (RT) in patients with diabetes type 1 with and without maculopathy and retinopathy in order to compare them with healthy subjects using high speed 3-dimensional (3D) 1060 nm optical coherence tomography (OCT). Methods. Thirty-three eyes from 33 diabetes type 1 subjects (23–57 years, 15 male) divided into groups of without pathology (NDR) and with pathology (DR; including microaneurysms, exudates, clinically significant ...
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      Mentions: Wolfgang Drexler Medical University of Vienna Susanne Binder

    16. Graphics processing unit-based dispersion encoded full-range frequency-domain optical coherence tomography

      Explore Linking to Scitation Content Ophthalmology
      Graphics processing unit-based dispersion encoded full-range frequency-domain optical coherence tomography
      Dispersion encoded full-range (DEFR) frequency-domain optical coherence tomography (FD-OCT) and its enhanced version, fast DEFR, utilize dispersion mismatch between sample and reference arm to eliminate the ambiguity in OCT signals caused by non-complex valued spectral measurement, thereby numerically doubling the usable information content. By iteratively suppressing asymmetrically dispersed complex conjugate artifacts of OCT-signal pulses the complex valued signal can be recovered without additional measurements, thus doubling the spatial signal range ...
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      Mentions: Cardiff University Medical University of Vienna Ling Wang
    17. 1-15 of 53 1 2 3 4 »
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  4. About Boris Považay

    Boris Považay

    Boris Povazay received his Ph.D. degree in Electrical Engineering from the Vienna University of Technology in 2006. From 2006 to 2009 he was lecturer at the School of Optometry and Vision Sciences, Cardiff University. In 2010 he joined the Center for Medical Physics and Biomedical Engineering, Medical University of Vienna as assistant professor. Since 2012 he works at the OptoLab at the Institute for Human Centered Engineering, Bern University of Applied Sciences and in the semiconductor industry. His current research interests are focused on development of novel imaging modalities such as OCT and other optical processes and applications in lithography and biomedicine.

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