Estimation method for biological tissue two-dimensional displacement field in ultrasonic elastography

Abstract

The invention discloses an estimation method for a biological tissue two-dimensional displacement field in ultrasonic elastography. The estimation method comprises the following steps of: (1) acquiring an ultrasonic image and estimating a longitudinal displacement component; (2) establishing a system discrete equation through a biological tissue mechanical model; and (3) estimating the biological tissue two-dimensional displacement field through H-infinity filtering. The estimation method for the two-dimensional displacement field disclosed by the invention obtains the optimal estimation for the displacement field by using a conventionally obtained longitudinal displacement measured value through an H-infinity filtering algorithm under the restriction of the biological mechanical model, so that the estimation method restores a high-quality lateral displacement component simultaneously when effectively filtering out the noise inside and outside the system, and is used for strain calculation and the reconstruction of elastic parameters; and compared with conventional methods, the estimation method disclosed by the invention can play a very effective role in the estimation for lateral displacement in the ultrasonic elastography.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic imaging, and in particular relates to a method for estimating a two-dimensional displacement field of biological tissue in ultrasonic elastic imaging. Background technique [0002] Ultrasonic elastography technology is a new type of ultrasonic imaging technology that has emerged in recent years to reflect the internal elastic characteristics of biological tissues. It uses ultrasonic RF signals to track the deformation and movement information of biological tissues before and after being squeezed by external forces, and obtains biological tissue through a certain algorithm. Mechanical properties such as strain and elastic modulus. Because biological tissue lesions are closely related to their mechanical characteristics, such as common breast cancer lesions are usually harder than normal tissues, ultrasound elastography can provide important auxiliary information for clinical medical diagnosis an...

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Problems solved by technology

However, in ultrasound elastography, since the spatial resolution of ultrasound signals in the lateral direction is significantly lower than that in the longitudinal direction, high-intensity numerical interpolation is required in the lateral direction.

Therefore, so far, the estimation of the two-dimensional displacement field is still restricted by the hardware conditions of the ultrasonic probe, so that the accuracy and resolution of the lateral displacement component cannot be very satisfactory.

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