Patent ID: 11903769
Assignee: SHANTOU INSTITUTE OF ULTRASONIC INSTRUMENTS CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 0:
1. A first-order estimation method of shear wave velocity, comprising the steps of:
demodulating entry data, comprising the steps of:
during an ultrasonic inspection process, converting an ultrasonic echo signal into an electrical signal by an ultrasonic probe, and converting the electrical signal into digital echo data by an ultrasonic equipment,
forming a data matrix with different echo data obtained at different scanning positions and different scanning times during the ultrasonic inspection process, and
forming the data matrix into an entry matrix I1 by a quadrature modulation by taking IQ data in complex form as data points;

calculating an angle value of the IQ data in complex form, comprising the steps of:
calculating the angle value of the complex IQ data of each data point of the matrix I1, and obtaining a real number of the corresponding data point to form an angle value matrix I2;

calculating a real average value of the angle value matrix, comprising the steps of:
calculating the real average value of all data at the same scanning position of the angle value matrix I2 to obtain a single-column mean value matrix I3;

obtaining an offset matrix, comprising the steps of:
introducing a matching matrix I4, wherein the matching matrix I4 is a single-row matrix which has the same columns as the angle value matrix I2 and its data point values are all real numbers “1”, and obtaining an offset matrix I5 by multiplying the single-column mean value matrix I3 and the matching matrix I4;

obtaining a displacement matrix, comprising the steps of:
by mutual operations of the angle value matrix I2 and the offset matrix I5, obtaining the displacement matrix I6 which is a displacement value of a particle that changes with time in a propagation of a shear wave;

calculating shear wave velocity, comprising the steps of:
forming the data of the displacement matrix I6 into multiple sets of displacement curves on a coordinate axis, and a highest value point of each displacement curve is taken to calculate the shear wave velocity Vs(t).