Tissue viscoelasticity measuring method based on shear wave amplitude and phase detection

Abstract

The invention provides a tissue viscoelasticity measuring method based on shear wave amplitude and phase detection. An acoustic radiation force excitation probe and an ultrasonic echo detection probe are used for detection at the same time, the acoustic radiation force excitation probe generates push wave beams, tissue generates shear waves at certain frequency, the ultrasonic echo detection probe generates detection wave beams to detect amplitude attenuation and phase change of the shear waves on a propagation path, the elasticity modulus and viscosity coefficient of the tissue are estimated through an amplitude attenuation coefficient and a speed detection value, in other words, the elasticity modulus and viscosity coefficient of the tissue can be quantitatively detected at the same time, precise and rich mechanical parameter information is provided for diagnosis of multiple diseases, the clinical application range of ultrasonic elastography can be widened, and the level of ultrasonic elastography can be improved. The method can carry out detection through the shear waves at one frequency, the system complexity and design cost are reduced, detection efficiency is improved, phase detection noise caused by high-frequency shear waves is avoided, and the accuracy of mechanical tissue parameter detection is improved.

Description

technical field [0001] The invention relates to the technical field of medical ultrasonic engineering, in particular to a method for measuring tissue viscoelasticity based on shear wave amplitude and phase detection. Background technique [0002] Ultrasound elastography is proposed in recent years and has shown great application prospects in clinical diagnosis. Pathological changes in tissues usually cause changes in elasticity (stiffness), such as liver fibrosis, liver cirrhosis, breast cancer, prostate cancer, etc. Therefore, tissue elastography can be used as a basis for the diagnosis of some major diseases. [0003] Tissues, however, are typically viscoelastic bodies, possessing viscous properties in addition to elasticity. Stickiness is also related to the pathological state of the tissue, and the detection of stickiness is also of great significance in medicine. However, the inventors of the present invention have found that many current elastography methods only pr...

AI Technical Summary

Problems solved by technology

[0008] In view of the fact that the existing ultrasonic elastography only provides the elastic parameter information of the tissue, the shear wave dispersion ultrasonic excitation technology needs to excite the tissue to generate shear waves of various frequencies. When the shear wave frequency is high, the detection accuracy is limited and the detection speed is slow. To solve the technical problem, the present invention provides a method for measuring tissue viscoelasticity based on shear wave amplitude and phase detection. The present invention models the tissue into a viscoelastic model that is closer to the characteristics of the tissue itself, using only one frequency of shear Wave energy simultaneously detects two characteristic parameters of tissue elasticity and viscosity

Images