Patent ID: 9737281
Date: 2017-08-22
CPC Classifications: A61B,G01S

Claim:
1. An ultrasound diagnostic equipment comprising: an ultrasound probe which transmits an ultrasound wave toward an inner part of a subject, which receives the ultrasound wave reflected by a particle body in the subject, and which outputs a received signal, wherein the particle body is a biological structure in the subject; a signal processing circuit which is configured to: (i) measure respective intensities of a plurality of predetermined frequencies in the received signal output by the ultrasound probe, (ii) calculate, as an intensity ratio, a ratio of the respective intensities of the plurality of frequencies in the received signal with respect to each other, and (iii) calculate a particle size of the particle body based on the calculated intensity ratio; and a memory which stores, in advance, a relation between (i) a Z function of Stenzel and (ii) a product k·a, where a is a particle radius of the particle body, k is defined as ω/c, ω is frequency of the ultrasound wave, and c is speed of the ultrasound wave, and wherein the Z function of Stenzel is directly proportional to intensity such that a ratio of Z functions of the plurality of frequencies in the received signal is the same as the intensity ratio; wherein the signal processing circuit (i) obtains the ratio of Z functions of the plurality of frequencies in accordance with the calculated intensity ratio, (ii) compares the ratio of Z functions of the plurality of frequencies with the relation stored in the memory, (iii) identifies Z functions in the stored relation which satisfy the obtained ratio of Z functions, each of the identified Z functions corresponding to one of the plurality of frequencies in the received signal, and (iv) calculates the particle size based on at least one of the identified Z functions using the stored relation.