1. Articles from Dmitry A. Terpelov

    1-6 of 6
    1. Optical coherence angiography without motion correction preprocessing

      Optical coherence angiography without motion correction preprocessing

      The method for vessel visualization from optical coherence tomography (OCT) data is presented. The method is based on high-frequency filtration of the normalized absolute values of the scattered field measured with OCT. It is shown that in contrast with optical coherence angiography based on the processing of complex values of a scattered field, the proposed processing does not require motion correction preprocessing while providing resulting angiographic images of comparable quality.

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    2. Digital refocusing in optical coherence tomography using finite impulse response filters

      Digital refocusing in optical coherence tomography using finite impulse response filters

      A finite impulse response filter, which shifts the focal plane in optical coherence tomography (OCT) images, is proposed. Since several OCT images with the focal plane in various positions can be fused into one image with increased lateral resolution, such a filter facilitates the creation of an OCT system with numerically increased lateral resolution, operating in real-time, i.e. showing one OCT B-scan with increased lateral resolution while collecting data for the next B-scan. Since the proposed real-time resolution enhancement method is phase-sensitive, the method for estimating and compensating phase shifts between consecutive B-scans during data acquisition is also discussed.

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    3. Noniterative method of reconstruction optical coherence tomography images with improved lateralresolution in semitransparent media

      Noniterative method of reconstruction optical coherence tomography images with improved lateralresolution in semitransparent media

      A method of OCT imaging with a resolution throughout the investigated volume equal to the resolution in the best-focused region is described. It is based on summation of three-dimensional scattered field distributions at the wavelengths determined by OCT source spectral decomposition. A method of finding parameters needed for algorithmic realization of the summation is also proposed. The proposed approaches are tested on several model media, including biological ones.

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    4. Feature Of The Week 4/1/12: Russian Institute of Applied Physics Investigates Digital Refocusing in Optical Coherence Tomography Systems

      Feature Of The Week 4/1/12: Russian Institute of Applied Physics Investigates Digital Refocusing in Optical Coherence Tomography Systems

      Over the past few years using electronic post optical detection processing to create a synthetic receiver field-of-view has become a very promising technique for offering improved performance in biomedical optical imaging systems. Various approaches around this basic theme have been used in OCT and non-OCT systems such as synthetic aperture radar, digital holography, and other microscopy techniques.  The approach not only allows for improving the classic depth-of-focus vs lateral resolution tradeoff in OCT systems but offers other promising performance enhancement such as eliminating the need for deformable mirrors in adaptive optics ophthalmic imaging and application benefits in other fields such ...

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    5. Digital refocusing in optical coherence tomography

      Digital refocusing in optical coherence tomography

      The problem of restoration Optical Coherence Tomography (OCT) images, acquired with tightly focused probing beam, in out-of-focus region for improving lateral resolution of the OCT has been considered. Phase stability issue has been discussed and phase equalization algorithm has been proposed. After phase equalization, the algorithm of digital refocusing, based on some methods from the DH, have been applied to the simulated as well as to experimental OCT data, acquired with tightly focused scanning beam to restore micrometer lateral resolution in the whole investigated volume.

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    6. Coherent noise compensation improvement in spectral-domain optical coherence tomography

      Coherent noise compensation improvement in spectral-domain optical coherence tomography

      An efficient technique of the coherent noise separation of and compensation for in spectral-domain optical coherence tomography (SD-OCT) is proposed and validated. The coherent noise is separated during one exposure by modulating the relative delay of the signal and reference waves by a certain waveform. It is shown that the influence of internal motions in an object on the coherent noise separation quality can be reduced by increasing of modulation frequency. The technique has been numerically and experimentally validated.

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    1-6 of 6
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  2. Topics in the News

    1. (6 articles) Institute of Applied Physics
    2. (6 articles) Dmitry A. Terpelov
    3. (6 articles) Grigory V. Gelikonov
    4. (5 articles) Valentin M. Gelikonov
    5. (5 articles) Pavel A. Shilyagin
    6. (1 articles) Elena B. Kiseleva
    7. (1 articles) Natalia D. Gladkova
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    Coherent noise compensation improvement in spectral-domain optical coherence tomography Digital refocusing in optical coherence tomography Feature Of The Week 4/1/12: Russian Institute of Applied Physics Investigates Digital Refocusing in Optical Coherence Tomography Systems Noniterative method of reconstruction optical coherence tomography images with improved lateralresolution in semitransparent media Digital refocusing in optical coherence tomography using finite impulse response filters Optical coherence angiography without motion correction preprocessing An air of optimism takes hold for CF sufferers Optical coherence tomography for dynamic axial correction of an optical end-effector for robot-guided surgical laser ablation Optical Coherence Tomography Angiography to Assess Vascular Remodeling of the Choriocapillaris After Low-Fluence Photodynamic Therapy for Chronic Central Serous Chorioretinopathy Automatic Classification of Retinal Optical Coherence Tomography Images With Layer Guided Convolutional Neural Network Diagnostic accuracy of intracoronary optical coherence tomography-derived fractional flow reserve for assessment of coronary stenosis severity Segmentation of Retinal Cysts From Optical Coherence Tomography Volumes Via Selective Enhancement