1. Articles from S. V. Frolov

    1-5 of 5
    1. Selection of Flow-Diverter Stent Models Using Optical Coherence Tomography and Mathematical Modeling of Hemodynamics

      Selection of Flow-Diverter Stent Models Using Optical Coherence Tomography and Mathematical Modeling of Hemodynamics

      We describe a method for increasing the effectiveness of surgery to position flow-diverter stents into cerebral arteries with aneurysms based on the combined use of mathematical modeling of hemodynamics and compression elastography. Approaches to determining Young's modulus and the Poisson's ratio for phantom of cerebral artery walls on the basis of endoscopic optical coherence tomography data were developed and tested. The applicability of this method was verified using a model of internal carotid artery aneurysm using a mathematical hemodynamic model taking into account the mechanical properties of the cerebral artery wall.

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    2. Monte-Carlo simulation of OCT structural images of human skin using experimental B-scans and voxel based approach to optical properties distribution

      Monte-Carlo simulation of OCT structural images of human skin using experimental B-scans and voxel based approach to optical properties distribution

      A method of optical coherence tomography (OCT) structural images reconstruction using Monte Carlo simulations is described. Biological object is considered as a set of 3D elements that allow simulation of media, structure of which cannot be described analytically. Each voxel is characterized by its refractive index and anisotropy parameter, scattering and absorption coefficients. B-scans of the inner structure are used to reconstruct a simulated image instead of analytical representation of the boundary geometry. Henye-Greenstein scattering function, Beer-Lambert-Bouguer law and Fresnel equations are used for photon transport description. Efficiency of the described technique is checked by the comparison of the simulated ...

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    3. Feature Of The Week 3/23/14: Tambov State Technical University Investigates One Specific Velocity Color Mapping One Specific Velocity Color Mapping

      Feature Of The Week 3/23/14: Tambov State Technical University Investigates One Specific Velocity Color Mapping One Specific Velocity Color Mapping

      The method of sign-sensitive mapping of the given range of velocities in a flow with complex geometry based on the principles of optical coherence tomography is described. To produce an alternating-sign flow, the 1% aqueous intralipid solution and the tilted capillary entry with the contraction coefficient 4:1 are used. The mapping is controlled using two parameters, the value of one specific velocity (OSV) for mapping and the accuracy of its determination. The structure image and two OSV images (for positive and negative direction of motion) are obtained as a result of selecting and processing the relevant parts of the ...

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    4. Doppler mapping of an alternating-sign flow with complex geometry using optical coherence tomography

      Doppler mapping of an alternating-sign flow with complex geometry using optical coherence tomography

      The method of sign-sensitive mapping of the given range of velocities in a flow with complex geometry based on the principles of optical coherence tomography is described. To produce an alternating-sign flow, the 1% aqueous intralipid solution and the tilted capillary entry with the contraction coefficient 4:1 are used. The mapping is controlled using two parameters, the value of one specific velocity (OSV) for mapping and the accuracy of its determination. The structure image and two OSV images (for positive and negative direction of motion) are obtained as a result of selecting and processing the relevant parts of the ...

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    5. Visualization of Blood Vessels Using Optical Coherence Tomography

      Visualization of Blood Vessels Using Optical Coherence Tomography

      New methods of optical coherence tomography (OCT) have been developed. OCT is a modern technique for noninvasive in vivo examination of upper layers of human skin and subcutaneous blood vessels using nonionizing radiation. The instruments described in this work use a low-power (0.2–0.4 mW) superluminescent diode. Several wavelengths can be applied simultaneously. Raster scanning and raster averaging in the interferometer sample arm increase the signal-to-noise ratio by 4–10 dB.

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    1-5 of 5
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    1. (1 articles) Cranfield University
    2. (1 articles) University of Athens
    3. (1 articles) Sun Yat-Sen University
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    Visualization of Blood Vessels Using Optical Coherence Tomography Doppler mapping of an alternating-sign flow with complex geometry using optical coherence tomography Feature Of The Week 3/23/14: Tambov State Technical University Investigates One Specific Velocity Color Mapping One Specific Velocity Color Mapping Monte-Carlo simulation of OCT structural images of human skin using experimental B-scans and voxel based approach to optical properties distribution Selection of Flow-Diverter Stent Models Using Optical Coherence Tomography and Mathematical Modeling of Hemodynamics Transient reduction in the retinal microvascular network following implantation surgery of implantable collamer lens: An OCT angiography study Evaluation of retinal vascular density and related factors in youth myopia without maculopathy using OCTA Detection Sensitivity of Retinitis Pigmentosa Progression Using Static Perimetry and Optical Coherence Tomography Post-remission retinal microvascular and choroidal thickness changes in eyes with Behḉet’s disease posterior uveitis: an OCTA longitudinal study Optical (OCT) Physicist Opening at Cylite Pty Ltd In vivo correlation between morphological characteristics of coronary plaques and functional characteristics of carotid arteries in acute coronary syndrome Diagnosis of retinal disorders from Optical Coherence Tomography images using CNN