1. Articles from S. G. Proskurin

    1-7 of 7
    1. 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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    2. 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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    3. 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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    4. 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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    5. Imaging of subcutaneous blood vessels and flow velocity profiles by optical coherence tomography

      Imaging of subcutaneous blood vessels and flow velocity profiles by optical coherence tomography

      We have applied a compact low power rapid scanning Doppler Optical Coherence Tomography system to monitor multi-dimensional velocity profiles within the complex vessels and simultaneous real-time non-invasive imaging of skin tissues morphology in vivo, in the wavelength range of 1.3–1.5 nm. Optical clearing of skin tissues has been utilized to achieve depth of OCT images up to 1.7 mm. Current approach enables applying low-power (0.4–0.5 mW) and low-noise broadband near-infrared light sources and obtaining OCT images with down to 12 μm spatial resolution. Two-dimensional time-domain OCT images of complex flow velocity profiles in ...

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    6. Optical coherence tomography imaging depth enhancement by superficial skin optical clearing

      Optical coherence tomography imaging depth enhancement by superficial skin optical clearing
      Non-invasive imaging of human skin and human skin tissues by optical coherence tomography (OCT) is a field exciting a great deal of interest especially in terms of day-to-day medical and biomedical diagnostics.We develop rapid scanning OCT system for non-invasive real-time imaging of topical skin tissues in vivo. We investigate the possibility of OCT image enhancement along the transcutaneous diffusion into the skin an optical clearing agent. Diffusion of optical clearing agents, e.g. such as glycerol, temporary increases transparency of topical skin tissues that allows for unrestricted sounding radiation permeating deeper into the skin. Increasing transparency of superficial skin ...
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    7. Visualisation of human subcutaneous blood vessels by increasing coherence probing depth

      Visualisation of human subcutaneous blood vessels by increasing coherence probing depth
      An improved Fourier-domain rapid-scanning optical delay in the reference arm of a Michelson interferometer is described which allows the use of a low-power superluminescent diode (down to 0.2 mW) and of a few wavelengths simultaneously. The method of raster scanning and averaging in the sample arm of the interferometer within a pixel provides an additional increase in the signal-to-noise ratio by 4–10 dB and, in combination with optical clearing, an increase in the coherence probing depth for the human skin in vivo up to 1.5–1.6 mm. As a result, subcutaneous blood vessels are visualised for ...
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    1-7 of 7
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  2. Topics in the News

    1. (4 articles) Cranfield University
    2. (1 articles) Saratov State University
    3. (1 articles) Medical University of Vienna
    4. (1 articles) University of Otago
    5. (1 articles) University of Athens
    6. (1 articles) Sun Yat-Sen University
    7. (1 articles) Kyoto University Graduate School of Medicine
    8. (1 articles) Columbia University
    9. (1 articles) University College London
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    Optical coherence tomography imaging depth enhancement by superficial skin optical clearing Imaging of subcutaneous blood vessels and flow velocity profiles by optical coherence tomography Visualisation of human subcutaneous blood vessels by increasing coherence probing depth 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 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