Instantaneous elasticity imaging code detection method and system

Abstract

The present invention discloses an instantaneous elasticity imaging code detection method and a system. The method comprises the steps: an instantaneous low-frequency signal sent by a signal generator is subjected to power amplification to drive an electromagnetic vibrator and motivate the generation of an instantaneous shear wave inside a medium; modulating the coding of an ultrasonic pulse signal, detecting and tracking the vibration signal of the instantaneous shear wave based on the coded excitation technique to obtain a coded ultrasonic echo signal; amplifying and sampling the received coded ultrasonic echo signal to obtain coded detection echo discrete data; decoding according to the digital pulse compression technique to obtain a vibration displacement signal generated during the propagating process of the shear wave in a to-be-detected medium; according to the extracted displacement signal, calculating the speed of the instantaneous shear wave and the elastic modulus of the to-be-detected medium; and outputting the speed of the instantaneous shear wave and the elastic modulus of the to-be-detected medium. According to the technical scheme of the invention, the average emission energy of signals is improved, and the signal-to-noise ratio of echo signals is increased. Meanwhile, the system detection sensitivity and the ultrasonic penetration capability are improved. Moreover, the vibration signal extraction quality of the shear wave is improved, and the depth-detection penetrating power of the instantaneous elasticity imaging process is enhanced.

Description

technical field [0001] The invention relates to the technical field of elastography, in particular to a method and system for detecting codes of instantaneous elastography. Background technique [0002] Transient elastography technology provides a fast, simple, non-invasive and completely painless method for detecting liver stiffness. Its principle is mainly to judge the stiffness of the liver by measuring the propagation speed of low-frequency shear waves in liver tissue fibers, thereby evaluating the liver stiffness. degree of fibrosis. French company ECHOSENS owns the VCTE (Vibration Controlled Transient Elasticity) patented technology for non-invasive quantitative diagnosis of liver hardness, which is specially used for FibroScan equipment. The main device of this transient elastic imaging technology is to fix the ultrasonic transducer on the electromagnetic vibrator, which generates low The instantaneous vibration drives the ultrasonic transducer probe itself to produc...

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method and system for transient elastography encoding detection, aiming at solving the problem of the attenuation of ultrasonic signals in the prior art, which makes it difficult to detect the tiny tissue vibration signals caused by shear wave propagation at depth positions. The signal is extracted to detect the phenomenon that the penetration is not enough, and it is difficult to achieve accurate detection of defects

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