1. Valentin M. Gelikonov

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    1. Mentioned In 67 Articles

    2. Elastographic mapping in optical coherence tomography using an unconventional approach based on correlation stability

      Elastographic mapping in optical coherence tomography using an unconventional approach based on correlation stability
      ...images are presented. Vladimir Y. Zaitsev ; Lev A. Matveev ; Alexandr L. Matveyev ; Grigory V. Gelikonov and Valentin M. Gelikonov "Elastographic mapping in optical coherence tomography using an unconventional approach...
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    3. Spectral reflectometry method and device

      Spectral reflectometry method and device
      An optical low-coherence reflectometry with spectral reception for obtaining images without coherent noise caused by self-interference of the radiation scattered from the studied object and by spurious reflections in the optical path of the system is disclosed. Two or more consecutive measurements of the interference spectrum are made. During at least one measurement of the interference spectrum by means of the interference control unit the phase between the interfering parts ...
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    4. A correlation-stability approach to elasticity mapping in optical coherence tomography

      A correlation-stability approach to elasticity mapping in optical coherence tomography
      A variant of compressional optical coherence elastography for mapping of the relative stiffness of biological tissues is reported. Unlike conventionally discussed displacement-based (DB) elastography, in which the decrease in the cross-correlation between subsequently obtained images is a negative factor causing errors in the mapping displacement and strain fields, we propose to intentionally use the difference in the correlation stability (CS) for deformed-tissue regions with different stiffnesses. We compare the parameter ...
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    5. Dual instrument for in vivo and ex vivo OCT imaging in an ENT department

      Dual instrument for in vivo and ex vivo OCT imaging in an ENT department
      A dual instrument is assembled to investigate the usefulness of optical coherence tomography (OCT) imaging in an ear, nose and throat (ENT) department. Instrument 1 is dedicated to in vivo laryngeal investigation, based on an endoscope probe head assembled by compounding a miniature transversal flying spot scanning probe with a commercial fiber bundle endoscope. This dual probe head is used to implement a dual channel nasolaryngeal endoscopy-OCT system. The two ...
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    6. Digital refocusing for transverse resolution improvement in optical coherence tomography

      Digital refocusing for transverse resolution improvement in optical coherence tomography
      Based on the fact that spectral domain (SD) optical coherence tomography (OCT) data can be treated as digital holography (DH) data acquired pointwise, we develop a spectral refocusing algorithm and show its ability to shift the focal region of OCT images obtained from SD OCT data acquired with a tightly focused scanning beam. Although refocusing itself depends on the refractive index of the studied media, we propose a procedure capable ...
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    7. Suppression of image autocorrelation artefacts in spectral domain optical coherence tomography and multiwave digital holography

      Suppression of image autocorrelation artefacts in spectral domain optical coherence tomography and multiwave digital holography
      An improved method for suppressing image artefacts in spectral domain optical coherence tomography (SD OCT) and multiwave digital holography, caused by the influence of coherent noise in the course of successive registration of an autocorrelation component and informative signal is reported. The method allows complete suppression of all types of coherent noises, provided that the sample of values used to record the autocorrelation component satisfies the conditions of Kotelnikov's ...
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    8. Optical coherence tomography device and method having improved boundary control and distortion correction

      Optical coherence tomography device and method having improved boundary control and distortion correction
      Variants of an interferometric device are developed for examining internal structures of objects by means of optical coherence tomography, which allow for controlling a boundary location of the observation range. The device also allows for correcting a distortion of the tomographic image of the object under study, caused by lateral scanning, due to aberrations of the optical path length for the low-coherence optical radiation directed towards the object. Embodiments of ...
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    9. 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 ...
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    10. 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 ...
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    11. Single-shot full complex spectrum spectrometer-based OCT with a single-line photodiode array

      Single-shot full complex spectrum spectrometer-based OCT with a single-line photodiode array
      An efficient technique of simultaneous obtaining of quadrature spectral components of interference signal in spectrometer-based OCT using a single-line linear photodiode array is proposed. The components are obtained in air-spaced non-polarization interferometer by partition of reference beam onto two parts and using an achromatic phase shifter. Several setups are described and compared.
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    12. Optical Coherence Tomography Used $500M of Federally Funded Research Over The Past Decade: How was it Used, What was Accomplished, and What’s to Come?

      Optical Coherence Tomography Used $500M of Federally Funded Research Over The Past Decade: How was it Used, What was Accomplished, and What’s to Come?
      The field of optical coherence tomography (OCT) has blossomed dramatically since some of the first work by various researchers around the world in the late 1980s and early 1990s. Since then there have been dozens of companies created, hundreds of research groups working on OCT, thousands of research articles published, millions of patients scanned with OCT, hundreds of millions of venture capital and corporate R&D dollars invested, hundreds of ...
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    13. Feature Of The Week 3/13/11: Russian Scientists Investigate Cross Polarization OCT for Early Bladder Cancer Detection

      Feature Of The Week 3/13/11: Russian Scientists Investigate Cross Polarization OCT for Early Bladder Cancer Detection
      ...nce tomography for early bladder-cancer detection: statistical study, Journal of Biophotonics, 1-14 (2010). V. M. Gelikonov and G. V. Gelikonov, New approach to cross-polarized optical coherence tomography based on ort...
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    14. Tunable Frequency Selector

      Tunable Frequency Selector
      The invention relates to laser technology and can be used for producing tunable lasers in the near-infrared range for spectral optical coherence tomography. The proposed tunable frequency selector can be used for a tunable laser having an active resonator with a shortest possible optical length, which resonator comprises the frequency selector, for operation in the generation of a single longitudinal mode in the active resonator. By using the frequency selector ...
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    15. 31-45 of 67 « 1 2 3 4 5 »
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  2. About Valentin M. Gelikonov

    Valentin M. Gelikonov

    Valentin M. Gelikonov graduated from the Gorky State University in 1966 and received his Ph.D. in 1985 and his Dr. Sc. in physics and mathematics in 2007. His fields of scientific interests include high sensitive optical measurements, low coherence fiber-optic interferometry, optical coherence tomography (OCT). He is Head of Department of Nonlinear Dynamics and Optics at the Institute of Applied Physics RAS. He has published about 120 papers in the fields of laser measurements, fiber-optic interferometry, and OCT. Dr. Gelikonov received the State Prize of the Russian Federation in Science and Technology in 1999.