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Your search keyword '"Gelikonov, Valentin M."' showing total 151 results
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151 results on '"Gelikonov, Valentin M."'

1. Hybrid M-mode-like OCT imaging of 3D microvasculature in vivo using reference-free processing of complex-valued B-scans

Author

Matveev, Lev A., Zaitsev, Vladimir Yu., Gelikonov, Grigory V., Matveyev, Alexandr L., Moiseev, Alexander A., Ksenofontov, Sergey, Gelikonov, Valentin M., Demidov, Valentin, and Vitkin, Alex

Subjects
Physics - Medical Physics, Physics - Biological Physics, Physics - Optics
Abstract

We propose a novel OCT-based method for visualizing microvasculature in 3D using reference-free processing of individual complex-valued B-scans with highly overlapped A-scans. In the lateral direction of such a B-scan, the amplitude and phase of speckles corresponding to vessel regions exhibit faster variability, and thus can be detected without comparison with other B-scans recorded in the same plane. This method combines elements of several existing OCT angiographic approaches, and exhibits: (i) enhanced robustness with respect to bulk tissue motion with frequencies up to tens of Hz; (ii) resolution of microcirculation images equal to that of structural images and (iii) possibility of quantifying the vessels in terms of their decorrelation rates., Comment: 4 pages, 2 figures

Published
2014
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3. Correlation-stability approach to elasticity mapping in OCT: comparison with displacement-based mapping and \textit{in vivo} demonstrations

Author

Zaitsev, Vladimir Yu., Matveev, Lev A., Gelikonov, Grigory V., Matveyev, Aleksandr L., and Gelikonov, Valentin M.

Subjects
Physics - Medical Physics, Physics - Biological Physics, Quantitative Biology - Quantitative Methods
Abstract

A variant of compression optical coherence elastography for mapping relative tissue stiffness is reported. Unlike conventionally discussed displacement-based (DB) elastorgaphy, in which the decrease in the cross-correlation is a negative factor causing errors in mapping displacement and strain fields, we propose to intentionally use the difference in the correlation stability (CS) for deformed tissue regions with different stiffness. We compare the parameter ranges (in terms of noise-to-signal ratio and strain) in which the conventional DB- and CS-approaches are operable. It is shown that the CS approach has such advantages as significantly wider operability region in terms of strain and is more tolerant to noises. This is favorable for freehand implementation of this approach. Examples of simulated and real CS-based elastographic OCT images are given., Comment: 4 pages, including 3 pages of the body text and 1 page with full-form references, 3 figures

Published
2012
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4. OCT in Gynecology

Author

Kuznetsova, Irina A., Gladkova, Natalia D., Gelikonov, Valentin M., Belinson, Jerome L., Shakhova, Natalia M., Feldchtein, Felix I., Drexler, Wolfgang, editor, and Fujimoto, James G., editor

Published
2015
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6. Optical Coherence Microscopy

Author

Gelikonov, Grigory V., Gelikonov, Valentin M., Ksenofontov, Sergey U., Morosov, Andrey N., Myakov, Alexey V., Potapov, Yury P., Saposhnikova, Veronika V., Sergeeva, Ekaterina A., Shabanov, Dmitry V., Shakhova, Natalia M., Zagainova, Elena V., and Tuchin, Valery V., editor

Published
2013
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7. Numerical method for axial motion artifact correction in retinal spectral-domain optical coherence tomography

Author

Ksenofontov, Sergey Yu., Shilyagin, Pavel A., Terpelov, Dmitry A., Gelikonov, Valentin M., and Gelikonov, Grigory V.

Abstract

A numerical method that compensates image distortions caused by random fluctuations of the distance to an object in spectral-domain optical coherence tomography (SD OCT) has been proposed and verified experimentally. The proposed method is based on the analysis of the phase shifts between adjacent scans that are caused by micrometer-scale displacements and the subsequent compensation for the displacements through phase-frequency correction in the spectral space. The efficiency of the method is demonstrated in model experiments with harmonic and random movements of a scattering object as well as during in vivo imaging of the retina of the human eye.

Published
2024
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8. Compact Optical Coherence Microscope

Author

Gelikonov, Grigory V., Gelikonov, Valentin M., Ksenofontov, Sergey U., Morosov, Andrey N., Myakov, Alexey V., Potapov, Yury P., Saposhnikova, Veronika V., Sergeeva, Ekaterina A., Shabanov, Dmitry V., Shakhova, Natalia M., Zagainova, Elena V., and Tuchin, Valery V., editor

Published
2004
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10. Motion Artifact Suppression Method for the Clinical Application of Otoscopic Spectral-Domain Optical Coherence Tomography.

Author

Ksenofontov, Sergey Y., Shilyagin, Pavel A., Gelikonov, Valentin M., and Gelikonov, Grigory V.

Subjects
OPTICAL coherence tomography, CLINICAL medicine, IMAGE reconstruction, OPERATING rooms
Abstract

A compact OCT device and a method for image reconstruction are described. The proposed algorithm contains a novel procedure for motion artifact suppression based on a correction of the phase of the original interferometric signal due to the mutual correlation of adjacent A-scans. This procedure corrects distortions caused by unwanted displacements of the probe relative to the object in real time at a speed of up to 3 mm/s and an image acquisition rate of 20 B-scans per second. All processing is performed in real time using only the CPU, allowing the device to be controlled from a consumer-grade laptop or compact PC without the need for a discrete GPU. Due to its compact size, the device can be used in the conditions of an ENT examination room or operating room and can be freely moved to another room without the help of additional personnel, if necessary. [ABSTRACT FROM AUTHOR]

Published
2023
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13. Optical Coherence Microscopy

Author

Gelikonov, Grigory V., primary, Gelikonov, Valentin M., additional, Ksenofontov, Sergey U., additional, Morosov, Andrey N., additional, Myakov, Alexey V., additional, Potapov, Yury P., additional, Saposhnikova, Veronika V., additional, Sergeeva, Ekaterina A., additional, Shabanov, Dmitry V., additional, Shakhova, Natalia M., additional, and Zagainova, Elena V., additional

Published
2012
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14. OCT Fundamentals and Clinical Applications of Endoscopic OCT

Author

Dolin, Lev S., primary, Gelikonov, Grigory V., additional, Gelikonov, Valentin M., additional, Gladkova, Natalia D., additional, Iksanov, Rashid R., additional, Kamensky, Vladislav A., additional, Kuranov, Roman V., additional, Sergeev, Alexander M., additional, Shakhova, Natalia M., additional, and Turchin, Ilya V., additional

Published
2012
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18. OCT-based three-dimensional strain mapping for elastography and relaxography

Author

Sovetsky, Alexander A., primary, Matveyev, Alexander L., additional, Gubarkova, Ekaterina V., additional, Matveev, Lev A., additional, Pavlova, Nadezhda P., additional, Plekhanov, Anton A., additional, Shabanov, Dmitry V., additional, Gelikonov, Valentin M., additional, Gelikonov, Grigory V., additional, Zagaynova, Elena V., additional, Gladkova, Natalia D., additional, and Zaitsev, Vladimir Yu., additional

Published
2019
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19. Development of real-time multimodal OCT with manual operation capabilities and emergence of its applications in clinical practice

Author

Gelikonov, Grigory V., primary, Matveev, Lev A., additional, Ksenofontov, Sergey Y., additional, Matkivsky, Vasily A., additional, Moiseev, Alexander A., additional, Matveyev, Aleksandr L., additional, Shabanov, Dmitry V., additional, Shilyagin, Pavel A., additional, Terpelov, Dmitry A., additional, Gladkova, Natalia D., additional, Zagaynova, Elena V., additional, Zaitsev, Vladimir U., additional, and Gelikonov, Valentin M., additional

Published
2019
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20. Two-dimensional OCT-relaxography of collagenous tissues

Author

Matveev, Lev A., primary, Karashtin, Dmitry A., primary, Shabanov, Dmitry V., primary, Gelikonov, Grigory V., primary, Gelikonov, Valentin M., primary, Zagaynova, Elena V., primary, Gladkova, Natalia D., primary, Vitkin, Alex, primary, Zaitsev, Vladimir Y., primary, Sovetsky, Alexander A., primary, Matveyev, Alexander L., primary, Gubarkova, Ekaterina V., primary, Sirotkina, Marina A., primary, and Druzhkova, Irina N., primary

Published
2018
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23. Quasistatic in-depth local strain relaxation/creep rate mapping using phase-sensitive optical coherence tomography

Author

Matveev, Lev A., primary, Karashtin, Dmitry A., primary, Sovetsky, Aleksandr A., primary, Gubarkova, Ekaterina V., primary, Sirotkina, Marina A., primary, Matveyev, Alexander L., primary, Shabanov, Dmitry V., primary, Gelikonov, Grigory V., primary, Gelikonov, Valentin M., primary, Druzhkova, Irina N., primary, Gladkova, Natalia D., primary, Vitkin, Alex, primary, Zagaynova, Elena V., primary, and Zaitsev, Vladimir Y., primary

Published
2017
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25. Two-dimensional OCT-relaxography of collagenous tissues.

Author

Matveev, Lev A., Sovetsky, Aleksandr A., Druzhkova, Irina N., Karashtin, Dmitry A., Matveyev, Alexander L., Shabanov, Dmitry V., Gelikonov, Grigory V., Gubarkova, Ekaterina V., Sirotkina, Marina A., Gelikonov, Valentin M., Gladkova, Natalia D., Vitkin, Alex, Zagaynova, Elena V., and Zaitsev, Vladimir Yu.

Published
2018
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27. Vessel-contrast enhancement in label-free optical coherence angiography based on phase and amplitude speckle variability

Author

Matveev, Lev A., additional, Demidov, Valentin, additional, Moiseev, Alexander A., additional, Gelikonov, Grigory V., additional, Matveyev, Alexandr L., additional, Gelikonov, Valentin M., additional, Karabut, Maria M., additional, Gubarkova, Ekaterina V., additional, Finagina, Elena S., additional, Sirotkina, Marina A., additional, Maslennikova, Anna V., additional, Gladkova, Natalia D., additional, Vitkin, Alex, additional, and Zaitsev, Vladimir Y., additional

Published
2016
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29. An approach to OCT-based microvascular imaging using reference-free processing of complex valued B-scans

Author

Matveev, Lev A., additional, Gelikonov, Grigory V., additional, Matveyev, Alexandr L., additional, Moiseev, Alexander A., additional, Ksenofontov, Sergey, additional, Gelikonov, Valentin M., additional, Sirotkina, Marina A., additional, Buyanova, Natalia L., additional, Gladkova, Natalia D., additional, Demidov, Valentin, additional, Vitkin, Alex, additional, and Zaitsev, Vladimir Y., additional

Published
2015
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31. Hybrid M-mode-like OCT imaging of three-dimensional microvasculature in vivo using reference-free processing of complex valued B-scans

Author

Matveev, Lev A., primary, Zaitsev, Vladimir Yu., additional, Gelikonov, Grigory V., additional, Matveyev, Alexandr L., additional, Moiseev, Alexander A., additional, Ksenofontov, Sergey Yu., additional, Gelikonov, Valentin M., additional, Sirotkina, Marina A., additional, Gladkova, Natalia D., additional, Demidov, Valentin, additional, and Vitkin, Alex, additional

Published
2015
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32. Scan-pattern and signal processing for microvasculature visualization with complex SD-OCT: tissue-motion artifacts robustness and decorrelation time - blood vessel characteristics

Author

Matveev, Lev A., additional, Zaitsev, Vladimir Y., additional, Gelikonov, Grigory V., additional, Matveyev, Alexandr L., additional, Moiseev, Alexander A., additional, Ksenofontov, Sergey Y., additional, Gelikonov, Valentin M., additional, Demidov, Valentin, additional, and Vitkin, Alex, additional

Published
2015
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36. Two-dimensional OCT-relaxography of collagenous tissues

Author

Todea, Carmen, Podoleanu, Adrian, Duma, Virgil-Florin, Matveev, Lev A., Sovetsky, Alexandr A., Druzhkova, Irina N., Karashtin, Dmitry A., Matveyev, Alexander L., Shabanov, Dmitry V., Gelikonov, Grigory V., Gubarkova, Ekaterina V., Sirotkina, Marina A., Gelikonov, Valentin M., Gladkova, Natalia D., Vitkin, Alex, Zagaynova, Elena V., and Zaitsev, Vladimir Yu.

Published
2018
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41. Multi-modal optical imaging characterization of atherosclerotic plaques.

Author

Gubarkova, Ekaterina V., Dudenkova, Varvara V., Feldchtein, Felix I., Timofeeva, Lidia B., Kiseleva, Elena B., Kuznetsov, Sergei S., Shakhov, Boris E., Moiseev, Alexander A., Gelikonov, Valentin M., Gelikonov, Gregory V., Vitkin, Alex, and Gladkova, Natalia D.

Abstract

We combined cross-polarization optical coherence tomography (CP OCT) and non-linear microscopy based on second harmonic generation (SHG) and two-photon-excited fluorescence (2PEF) to assess collagen and elastin fibers and other vascular structures in the development of atherosclerosis, including identification of vulnerable plaques, which remains an important clinical problem and imaging application. CP OCT's ability to visualize tissue birefringence and cross-scattering adds new information about the microstructure and composition of the plaque. However its interpretation can be ambiguous, because backscattering contrast may have a similar appearance to the birefringence related fringes. Our results represent a step towards minimally invasive characterization and monitoring of different stages of atherosclerosis, including vulnerable plaques. CP OCT image of intimal thickening in the human coronary artery. The dark stripe in the cross-polarization channel (arrow) is a polarization fringe related to the phase retardation between two eigen polarization states. It is histologically located in the area of the lipid pool, however this stripe is a polarization artifact, rather than direct visualization of the lipid pool. [ABSTRACT FROM AUTHOR]

Published
2016
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46. Quasistatic in-depth local strain relaxation/creep rate mapping using phase-sensitive optical coherence tomography

Author

Wojtkowski, Maciej, Boppart, Stephen A., Oh, Wang-Yuhl, Matveev, Lev A., Karashtin, Dmitry A., Sovetsky, Aleksandr A., Gubarkova, Ekaterina V., Sirotkina, Marina A., Matveyev, Alexander L., Shabanov, Dmitry V., Gelikonov, Grigory V., Gelikonov, Valentin M., Druzhkova, Irina N., Gladkova, Natalia D., Vitkin, Alex, Zagaynova, Elena V., and Zaitsev, Vladimir Yu.

Published
2017
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