1. Institute of Applied Physics

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    1. Mentioned In 130 Articles

    2. Cross-polarization optical coherence tomography for brain tumor imaging

      Explore Frontiers Neurology
      Cross-polarization optical coherence tomography for brain tumor imaging
      This paper considers valuable visual assessment criteria for distinguishing between tumorous and non-tumorous tissues, intraoperatively, using cross-polarization OCT (CP OCT) OCT with a functional extension, that enables detection of the polarization properties of the tissues in addition to their conventional light scattering. Materials and methods. The study was performed on 176 ex vivo human specimens obtained from 30 glioma patients. To measure the degree to which the typical parameters of ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Pavel A. Shilyagin

    3. Time-related ex vivo changes in the optical properties of normal brain tissues

      Explore IOPscience Neurology
      Time-related ex vivo changes in the optical properties of normal brain tissues
      The aim of the study was to observe time-related changes in the optical properties of normal brain tissues as measured using cross-polarization optical coherence tomography (CP OCT). 32 ex vivo tissue samples from 16 animals (rats) were monitored under different external conditions, over a period of 1 hour after excision, to measure time-related optical changes. It was found that the optical properties of white matter were quite stable over the ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Elena V. Zagaynova

    4. Optical coherence angiography without motion correction preprocessing

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      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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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Natalia D. Gladkova

    5. Quantitative nontumorous and tumorous human brain tissue assessment using microstructural co- and cross-polarized optical coherence tomography

      Explore Nature Publishing Group Neurology , Oncology
      Quantitative nontumorous and tumorous human brain tissue assessment using microstructural co- and cross-polarized optical coherence tomography
      Optical coherence tomography (OCT) is a promising method for detecting cancer margins during tumor resection. This study focused on differentiating tumorous from nontumorous tissues in human brain tissues using cross-polarization OCT (CP OCT). The study was performed on fresh ex vivo human brain tissues from 30 patients with high- and low-grade gliomas. Different tissue types that neurosurgeons should clearly distinguish during surgery, such as the cortex, white matter, necrosis and ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Elena V. Zagaynova

    6. Measurement and Compensation for the Amplitude and Phase Spectral Distortions of an Interference Signal in Optical Coherence Tomography for the Relative Optical-Spectrum Width Exceeding 10%

      Explore Home - Springer
      Measurement and Compensation for the Amplitude and Phase Spectral Distortions of an Interference Signal in Optical Coherence Tomography for the Relative Optical-Spectrum Width Exceeding 10%
      We describe a universal method of compensating for the arbitrary dispersion in the spectral and time domain optical coherence tomography systems. In combination with the amplitude method of correcting the optical-spectrum irregularities, this approach allows one to obtain the spectrally determined resolution if the instrument function is close to the Gaussian one. The efficiency of the method is demonstrated in the time and spectral domain optical coherence tomographies with the ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Valentin M. Gelikonov

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

      Explore IOPscience
      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 ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Valentin M. Gelikonov

    8. Time domain optical coherence tomography is a useful tool for diagnosing otitis media with effusion

      Explore IOPscience Otolaryngology
      Time domain optical coherence tomography is a useful tool for diagnosing otitis media with effusion
      The usability of time-domain optical coherence tomography equipped with a flexible endoscopic probe for detecting effusion in the tympanic cavity is shown in the clinical environment. The possibility of assessing the dynamic properties of effusion, particularly its contained scatterers' mobility, is shown in real clinical cases. A method of comparative assessment of scatterers' mobility is proposed.
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      Mentions: Natalia M. Shakhova Nizhny Novgorod State Medical Academy Institute of Applied Physics

    9. Optical coherence tomography‐based angiography device with real‐time angiography B‐scans visualization and hand‐held probe for everyday clinical use

      Explore Wiley Online Library
      Optical coherence tomography‐based angiography device with real‐time angiography B‐scans visualization and hand‐held probe for everyday clinical use
      ...xander Moiseev, Nano‐optics and highly sensitive optical measurement department, Institute of Applied Physics Russian Academy of Sciences, Nizhny Novgorod, Russia.Email: aleksandr.moiseev@gmail.com Alexander Moiseev, Nan...
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      Mentions: University of Toronto Natalia M. Shakhova I. Alex Vitkin

    10. Equidistant Recording of the Spectral Components in Ultra-Wideband Spectral-Domain Optical Coherence Tomography

      Explore Home - Springer
      Equidistant Recording of the Spectral Components in Ultra-Wideband Spectral-Domain Optical Coherence Tomography
      We develop an effective method for reducing nonequidistance when recording the spectral components of an interference signal in ultra-wideband spectral-domain optical coherence tomography. For this purpose, a corrector consisting of two identical prisms is used in a diffraction-grating spectrometer. The corrector rotation with respect to the diffraction-grating plane and a variation in the angle between the corrector elements allow one to adjust the equidistant spatial distribution of the spectral components ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Valentin M. Gelikonov

    11. Quantitative Cross-Polarization Optical Coherence Tomography Detection of Infiltrative Tumor Margin in a Rat Glioma Model: a Pilot Study

      Explore Журнал СТМ
      Quantitative Cross-Polarization Optical Coherence Tomography Detection of Infiltrative Tumor Margin in a Rat Glioma Model: a Pilot Study
      Determining boundaries of infiltrative glial tumors remains a challenging problem in neurooncology. Optical coherence tomography (OCT) with cross-polarization (CP) visualization is a promising technique as a surgical guidance tool. However, the outcome of the procedures performed under OCT guidance strongly depends on the surgeons qualification. Thus, a quantitative method for assessing resection margins with OCT is required. The aim of this study was to develop a robust quantitative approach for ...
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      Mentions: University of Toronto I. Alex Vitkin Institute of Applied Physics

    12. Cross-Polarization Optical Coherence Tomography in Comparative in vivo and ex vivo Studies of the Optical Properties of Normal and Tumorous Brain Tissues

      Explore Журнал СТМ Neurology
      Cross-Polarization Optical Coherence Tomography in Comparative in vivo and ex vivo Studies of the Optical Properties of Normal and Tumorous Brain Tissues
      The aim of the study was to provide visual and quantitative evaluation of tumorous and normal brain tissue images obtained by cross-polarization optical coherence tomography (CP OCT) in a comparative in vivo and ex vivo study. Materials and Methods. The CP OCT as a non-damaging noninvasive optical method for tissue structure imaging was used in the study. It enables obtaining volumetric images of 2.42.41.25 mm 3 in ...
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      Mentions: Nizhny Novgorod State Medical Academy Institute of Applied Physics Natalia D. Gladkova

    14. Optical coherence tomography in gynecology: a narrative review

      Explore SPIE Digital Library Gynecology
      Optical coherence tomography in gynecology: a narrative review
      Modern gynecologic practice requires noninvasive diagnostics techniques capable of detecting morphological and functional alterations in tissues of female reproductive organs. Optical coherence tomography (OCT) is a promising tool for providing imaging of biotissues with high resolution at depths up to 2 mm. Design of the customized probes provides wide opportunities for OCT use in gynecology. This paper contains a retrospective insight into the history of OCT employment in gynecology, an ...
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      Mentions: Nizhny Novgorod State Medical Academy Institute of Applied Physics Mikhail Y. Kirillin

    15. A data-acquisition and control system for spectral-domain optical coherence tomography with a speed of 91 912 A-scans/s based on a USB 3.0 interface

      Explore Home - Springer
      A data-acquisition and control system for spectral-domain optical coherence tomography with a speed of 91 912 A-scans/s based on a USB 3.0 interface
      We describe a system of optical spectrum registration at the output of an interferometer with controlled phase shifts for an experimental device intended for visualizing the internal structure of an optically turbid specimen, using the method of spectral domain optical coherence tomography. A device for spectral domain optical coherence tomography based on a common-path optical scheme with a USB 3.0 interface for inputting data into a computer has been ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Valentin M. Gelikonov

    16. Medium chromatic dispersion calculation and correction in spectral-domain optical coherence tomography

      Explore Home - Springer
      Medium chromatic dispersion calculation and correction in spectral-domain optical coherence tomography
      A method for determining and correcting distortions in spectral-domain optical coherence tomography images caused by medium dispersion was developed. The method is based on analysis of the phase distribution of the interference signal recorded by an optical coherence tomography device using an iterative approach to find and compensate for the effect of a mediums chromatic dispersion on point-spread function broadening in optical coherence tomography. This enables compensation of the impact ...
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      Mentions: Institute of Applied Physics Grigory V. Gelikonov Valentin M. Gelikonov
    17. 1-15 of 130 1 2 3 4 5 6 7 8 9 »
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  4. About Institute of Applied Physics

    Institute of Applied Physics

    Institute of Applied Physics of the Russian Academy of Sciences (IAP RAS) was created by a Decree of the Soviet Government on July 28, 1976. Annually the IAP RAS performs about 350 scientific projects, funded by federal special programs, academic, industry, international and other programs and projects. Among the most prominent achievements of the Institute of Applied Physics RAS are the invention of gyrotrons and gyroklystrons and their upgrading to a high technical level, the development of effective methods to convert and transport powerful electromagnetic radiation, the elaboration of physical principles for excitation and reception of low-frequency sound fields in the ocean and the creation of hardware for hydroacoustics and long-term acoustical monitoring in the ocean, complexes for research of noise radiation characteristics of moving objects, the development of high-rate growth and precision processing of water-soluble crystals, developmet of optical coherent tomography to image biotissue structures and designing an optical tomograph for medical diagnostics of human internal organs  See IAP RAS OCT link HERE.

  5. Related Topics

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    2. Method for studying a sample and optical interferometer for doing the same
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    3. Gold nanoshells for OCT imaging contrast: From model to in-vivo study
      50 articles also mentioned Nizhny Novgorod State Medical Academy
    4. Optical coherence tomography apparatus, optical fiber lateral scanner and a method for studying biological tissues in vivo
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    5. Optimization of Fizeau-based optical coherence tomography with a reference Michelson interferometer
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