Elasticity measurement method and system based on moving acoustic beam coherently exciting shear waves

Abstract

The invention discloses a mobile acoustic beam coherence excitation shear wave-based elasticity measurement method and system. The mobile acoustic beam coherence excitation shear wave-based elasticity measurement method comprises the steps of exciting soft tissues at multiple preset positions to vibrate to generate shear waves through transmitting mobile exciting acoustic beams to an excitation region; transmitting probe pulses to detect the shear waves generated by excitation and storing echo data; increasing a default step length to the movement speed of the current exciting acoustic beam, and further transmitting the mobile exciting acoustic beam until the movement speed is increased to a preset upper limit value; and calculating vibration amplitude values of all shear waves, searching the movement speed corresponding to the shear wave with the maximum vibration amplitude value, determining the movement speed to be a shear wave speed value of the soft tissues in the excitation region, and calculating the elastic parameter of the excitation region according to the shear wave speed value. The shear wave speed does not need to be estimated by using a time transit algorithm, and the vibration amplitude and the detection signal-to-noise ratios of the shear waves are effectively strengthened.

Description

technical field [0001] The invention relates to the field of medical technology, in particular to an elastic measurement method and system based on coherent excitation of shear waves by moving sound beams. Background technique [0002] The shear wave ultrasound elastography based on the acoustic radiation force can realize the quantitative measurement of the local elastic information of the soft tissue, which is to generate the acoustic radiation force by emitting high-intensity ultrasound to focus on the local area inside the tissue, so that the local tissue vibrates to generate a shear wave, and then Ultrasonic method is used to monitor the propagation of shear wave and calculate the propagation velocity of shear wave, so as to realize the quantitative analysis of soft tissue elasticity. At present, shear wave ultrasound elastography methods based on acoustic radiation force mainly include Acoustic radiation force imaging (ARFI), Surpersonic shear imaging (SSI), shear wave...

AI Technical Summary

Problems solved by technology

Due to the attenuation of the shear wave by soft tissue, the distance of the lateral propagation of the shear wave is very limited, and as the depth increases, the amplitude of the shear wave will become weaker, so that the signal-to-noise ratio of ultrasonic detection is very low and cannot be accurately detected. Estimation of shear wave velocity and tissue elasticity

Especially for some transducers and low-end imaging systems, their hardware conditions cannot support the emission of high-intensity long pulses, resulting in weaker acoustic radiation and unable to measure tissue elasticity

Images