Search Results - "Sapozhnikov, O A"

Spatial Correction of an Acoustic Hologram for Reconstructing Surface Vibrations of an Axially Symmetric Ultrasound Transducer by Kaloev, A. Z., Nikolaev, D. A., Khokhlova, V. A., Tsysar, S. A., Sapozhnikov, O. A.

“…A method is proposed for spatially correcting an acoustic hologram recorded on an arbitrarily oriented planar area in front of an axially symmetric ultrasound…”
Get full text

Physical mechanisms of the therapeutic effect of ultrasound (a review) by Bailey, M. R., Khokhlova, V. A., Sapozhnikov, O. A., Kargl, S. G., Crum, L. A.

Get full text

Numerical modeling of finite-amplitude sound beams: Shock formation in the near field of a cw plane piston source by Khokhlova, V. A., Souchon, R., Tavakkoli, J., Sapozhnikov, O. A., Cathignol, D.

“…Two theoretical models and the corresponding numerical codes for the description of nonlinear acoustic beams radiated from intense cw sources in water are…”
Get full text

The mechanism of lesion formation by focused ultrasound ablation catheter for treatment of atrial fibrillation by Sinelnikov, Y. D., Fjield, T., Sapozhnikov, O. A.

“…The application of therapeutic ultrasound for the treatment of atrial fibrillation (AF) is investigated. The results of theoretical and experimental…”
Get full text

Broadband Vibrometry of a Two-Dimensional Ultrasound Array Using Transient Acoustic Holography by Tsysar, S. A., Nikolaev, D. A., Sapozhnikov, O. A.

“…The article presents the results of experimental determination of the structure of surface vibrations of a two-dimensional phased ultrasound probe using…”
Get full text

Phase Correction of the Channels of a Fully Populated Randomized Multielement Therapeutic Array Using the Acoustic Holography Method by Tsysar, S. A., Rosnitskiy, P. B., Asfandiyarov, S. A., Petrosyan, S. A., Khokhlova, V. A., Sapozhnikov, O. A.

“…The acoustic holography method was used to characterize a therapeutic focused fully populated 256-element ultrasonic transducer array. Elements of the array…”
Get full text

Calculating an Acoustic Trap for an Elastic Spherical Scatterer of Large Wave Size by Krokhmal, A. A., Krokhmal, N. E., Sapozhnikov, O. A.

“…Modeling is performed for an acoustic trap created in a liquid using a multi-element ring transducer operating in a megahertz frequency band. A GUI service…”
Get full text

Pilot ex vivo study on non-thermal ablation of human prostate adenocarcinoma tissue using boiling histotripsy by Rosnitskiy, P.B., Tsysar, S.A., Karzova, M.M., Buravkov, S.V., Malkov, P.G., Danilova, N.V., Ponomarchuk, E.M., Sapozhnikov, O.A., Khokhlova, T.D., Schade, G.R., Maxwell, A.D., Wang, Y.-N., Kadrev, A.V., Chernyaev, A.L., Okhobotov, D.A., Kamalov, A.A., Khokhlova, V.A.

“…•Histotripsy ablation of human prostate cancer ex vivo performed for the first time.•The dimensions of the lesion were consistent with those predicted before…”
Get full text

An exact solution to the Helmholtz equation for a quasi-Gaussian beam in the form of a superposition of two sources and sinks with complex coordinates by Sapozhnikov, O. A.

“…An exact solution to the Helmholtz equation is proposed. The solution describes a quasi-Gaussian beam with an arbitrary width and has the form of a…”
Get full text

Determination and Compensation of Axes Misalignment of Three-Coordinate Positioning Systems Using Acoustic Holography by Nikolaev, D. A., Tsysar, S. A., Sapozhnikov, O. A.

“…Automatic positioning systems are widely used to measure acoustic fields. In practice, the orthogonality of the mechanical axes of systems can be violated…”
Get full text

Compensation for Aberrations When Focusing Ultrasound Through the Skull Based on CT and MRI Data by Chupova, D. D., Rosnitskiy, P. B., Solontsov, O. V., Gavrilov, L. R., Sinitsyn, V. E., Mershina, E. A., Sapozhnikov, O. A., Khokhlova, V. A.

“…The study compares the capabilities of using 3D acoustic models of the human head, constructed using magnetic resonance imaging (MRI) and computed tomography…”
Get full text

Determination of the Elastic Properties of a Solid Sphere Based on the Results of Acoustic Beam Scattering by Kotelnikova, L. M., Nikolaev, D. A., Tsysar, S. A., Sapozhnikov, O. A.

“…When using elastic spherical scatterers in acoustic problems, it is necessary to know their main elastic parameters that characterize the internal resonances…”
Get full text

Designing Fully Populated Phased Arrays for Noninvasive Ultrasound Surgery with Controlled Degree of Irregularity in the Arrangement of Elements by Rosnitskiy, P. B., Sapozhnikov, O. A., Gavrilov, L. R., Khokhlova, V. A.

“…When designing phased antenna arrays for use in noninvasive ultrasound surgery, it is desirable to provide the highest possible power for a given array…”
Get full text

Creating a Reference Plane Ultrasonic Wave in a Fluid Using a Plane Piezoelectric Transducer with a Large Wave Dimension by Krokhmal, A. A., Nikolaev, D. A., Tsysar, S. A., Sapozhnikov, O. A.

“…The article discusses the possibility of using a plane piezoelectric transducer with a large wave dimension as the source of a reference plane ultrasonic wave,…”
Get full text

Use of Phase Masks to Construct the Required Spatial Pattern of an Ultrasonic Field by Nikolaev, D. A., Petrosyan, S. A., Tsysar, S. A., Rosnitsky, P. B., Sapozhnikov, O. A.

“…A way of constructing a required distribution of an ultrasonic field in the range of megahertz frequencies in a liquid is developed by combining a system of…”
Get full text

Nonlinear Spherical Standing Waves in an Acoustically Excited Liquid Drop by Sapozhnikov, O. A., Annenkova, E. A.

“…Nonlinear evolution of a standing acoustic wave in a spherical resonator with a perfectly soft surface is analyzed. Quadratic approximation of nonlinear…”
Get full text

Controlling the Coefficient of Reflection of Sound from a Plane Piezoelectric Plate by Selecting its Electrical Load by Kotelnikova, L. M., Krokhmal, A. A., Nikolaev, D. A., Tsysar, S. A., Sapozhnikov, O. A.

“…An analysis is performed of the possibility of minimizing the coefficient of reflection of a plane acoustic wave from a plane piezoelectric transducer by…”
Get full text

Theoretical Study of the Cavitation Mechanism of the Twinkling Artefact in the Ultrasound Imaging of Kidney Stones by Polyanskiy, A. I., Sapozhnikov, O. A.

“…A numerical model is constructed that allows signals of diagnostic ultrasonic pulses scattered on stones and bubbles to be obtained. The model is based on…”
Get full text

Estimation of the Thickness Profile of a Human Skull Phantom by Ultrasound Methods Using a Two-Dimensional Array by Asfandiyarov, S. A., Rosnitskiy, P. B., Tsysar, S. A., Yuldashev, P. V., Khokhlova, V. A., Sinitsyn, V. E., Mershina, E. A., Sapozhnikov, O. A.

“…The paper presents the results of evaluating the thickness profile of a skull phantom using a two-dimensional ultrasound array consisting of piezoelectric…”
Get full text

Creating Tubular Structures from Tissue Spheroids via the Acoustic Radiation Force by Krokhmal, A. A., Sapozhnikov, O. A., Koudan, E. V., Gryadunova, A. A., Tsysar, S. A., Petrov, C. V., Pereira, F., Hesuani, Y. D., Mironov, V. A., Parfenov, V. A.

“…A method is proposed of fabricating tubular constructs from tissue spheroids (conglomerates of cells up to 200 μm in size) in a nutrient fluid using the…”
Get full text