Detection method and system for shear-wave velocity of acoustic radiation

Abstract

The application discloses a detection method and system for shear-wave velocity of acoustic radiation. The detection method comprises following steps: respectively selecting an impact position, a first detection position and a second detection position and impacting acoustic radiation force of the impact position; respectively accumulating two groups of time-depth-shear wave displacement matrixes along the depth direction in order to obtain two groups of accumulative displacement arrays formed by accumulation and composition; respectively searching maximum value of the two groups of accumulative displacement arrays and utilizing maximum value as shear-wave crest position time; and calculating shear-wave velocity according to the distance between the first detection position and the second detection position and shear-wave crest position time of the first detection position and the second detection position. The detection method and system for shear-wave velocity of acoustic radiation have following beneficial effects: without searching for focal positions of the displacement matrixes, the displacement matrixes are firstly accumulated along the depth direction and information on shear-wave crest in different depths is comprehensively utilized so that the time position where most shear-wave crests pass through is found out and the horizontal position where the maximum value is located is obtained, therefore calculating shear-wave velocity.

Description

technical field [0001] The present application relates to ultrasonic imaging technology, in particular to a method and system for detecting acoustic radiation shear wave velocity. Background technique [0002] The core of acoustic radiation force imaging is the quantitative analysis of tissue stiffness by capturing shear waves. Estimation of shear wave velocity is key to the calculation of Young's modulus (stiffness) and is the basis for imaging. In the paper "AcousticRadiationForceImpulseImaging: inVivoDemonstrationofClinicalFeasibility", the Duke University research group proposed the TOF (TimeofFlight, time of flight) method for shear wave velocity estimation. Such as figure 1 As shown, after using the acoustic radiation force to impact the position of the impact 30, select two position points on the tissue 10: the first detection position and the second detection position, record the distance between them as ΔR, and calculate by cross-correlation method The displaceme...

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Problems solved by technology

[0003] However, the TOF method also has the following defects: the TOF method requires first finding the shear wave depth position with the strongest displacement (that is, the focus position), and then drawing the flight curve, and then calculating the shear wave velocity by finding the peak position in the flight curve

This will greatly increase the time-consuming operation, and the operation overlap rate and redundancy are very large

2. The signal-to-noise ratio of the radiation force signal is required to be high, otherwise it is easy to mistake the noise point for the focal point

However, in the actual application of human body or animals, the effect of radiation force will be disturbed a lot, the focus position in the displacement matrix is ​​not easy to find, and when the effect of acoustic radiation force is weak, the tissue displacement caused by shear wave is not obvious, so the TOF method is used Difficult to pinpoint wave crest location and estimate wave velocity

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