Transient shearlet excitation system and transient shearlet excitation method based on ring external vibration

Abstract

The invention provides a transient shearlet excitation system and a transient shearlet excitation method based on ring external vibration. The transient shearlet excitation system comprises a transient shearlet excitation device driving module, a shearlet excitation device, an ultrasonic testing device and an elastic analysis module, wherein the transient shearlet excitation device driving module is used for generating transient low-frequency signals which are used for driving an electromagnetic vibrator after being amplified, and the electromagnetic vibrator drives the shearlet excitation device to vibrate; the shearlet excitation device is used for subjecting the medium surface to be tested to transient vibration under drive of vibration of the electromagnetic vibrator, and shearlet is generated in a medium; the ultrasonic testing device comprises an ultrasonic transducer arranged on a central axis of the shearlet excitation device, and is used for giving out ultrasonic waves to test sidelobe-focused shearlet components in the shearlet. The transient shearlet excitation system and the transient shearlet excitation method based on ring external vibration have the advantages that since the shearlet excitation device subjects the medium surface to be tested to transient vibration and superimposed shearlet components are generated in the central axis of the medium, energy and depth of the shearlet in the ring central axis direction of the medium to be tested are increased, and transient elastography test penetration depth is increased.

Description

technical field [0001] The invention relates to the field of shear wave technology, in particular to an instantaneous shear wave excitation system and method based on external vibration of a circular ring. 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. The VCTE (Vibration Control Transient Elasticity) patented technology for non-invasive quantitative diagnosis of liver stiffness, owned by French ECHOSENS company, is specially used for FibroScan (fiber scanning) equipment. The main device of this transient elastography technology is to fix the ultrasonic transducer on the electromagnetic oscillator , the electromagnetic oscillator generates low-frequency i...

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Problems solved by technology

[0005] In view of the deficiencies of the above-mentioned prior art, the object of the present invention is to provide an instantaneous shear wave excitation system and method based on the external vibration of the circular ring, aiming at solving the problem in the prior art that the electromagnetic oscillator drives the ultrasonic testing device. The ultrasonic transducer vibrates, the ultrasonic transducer itself vibrates the surface of the medium to be measured instantaneously, and the interior of the excitation medium generates instantaneous shear waves, while the shear wave energy directly below the tissue vibration driven by the ultrasonic transducer vibration is relatively weak. The downward propagation depth of shear wave is limited, and the detection penetration of transient elastic imaging is not enough, so it is difficult to realize the problem of deep elastic detection

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