FIELD: medicine.
SUBSTANCE: group of inventions relates to medical equipment, specifically to means of determining viscoelastic medium parameter. Method involves applying a defined single-frequency mechanical vibration to a viscoelastic medium to form a transverse wave in a viscoelastic medium, emitting ultrasonic waves from a single-channel source to a viscoelastic medium and receiving the ultrasonic echo signals during propagation of the transverse wave in the viscoelastic medium, obtaining data on the maximum movement of the transverse wave at different depths in accordance with the ultrasonic echoes, wherein each set of data on maximum displacement represents maximum amplitude of transverse wave oscillations, when transverse wave passes through different depths in viscoelastic medium, approximation of each set of data on maximum displacement to obtain graph of attenuation of maximum displacement, determination of viscoelasticity parameter of viscoelastic medium based on decay curve of maximum displacement, wherein approximation of each set of data on maximum displacement to obtain graph of attenuation of maximum displacement comprises: performing filtering processing of each set of data on maximum movement in time and frequency regions for screening abnormal data on maximum displacement, polynomial approximation of each set of data on maximum movement after excluding abnormal data to obtain a schedule of attenuation of maximum displacement. Device comprises a main computing device and a probe, which comprises a vibrator and an ultrasonic transducer, wherein vibrator controlled by main computing device applies single-frequency mechanical vibration to viscoelastic medium to form transverse wave in viscoelastic medium, in the process of propagation of the transverse wave in a viscoelastic medium, the converter controlled by the main computing device emits ultrasonic waves from the single-channel source to the viscoelastic medium and receives ultrasonic echo signals, and the main computing device comprises a first information acquisition module configured to collect data on the transverse shear movement at different depths in accordance with the ultrasonic echoes, wherein each set of data on maximum displacement represents maximum amplitude of transverse wave oscillations when transverse wave passes through different depths in viscoelastic medium, a computational module configured to approximate the maximum displacement data to obtain a maximum displacement decay schedule, and a first determination module configured to determine a viscoelastic parameter of the viscoelastic medium from a maximum displacement decay schedule, wherein the computing unit comprises a first computing unit configured to perform filtering processing of each set of data on maximum movement in the time and frequency regions, to screen out abnormal data in each set of data on maximum displacement, a second computing unit configured to polynomial approximation of each set of data on maximum movement after excluding abnormal data to obtain a graph of attenuation of maximum displacement.
EFFECT: use of inventions provides more accurate measurement of tissue fibrosis.
8 cl, 5 dwg
