Multi-shape plane shear wave composite imaging method based on Mach cone effects

Abstract

The invention provides a multi-shape plane shear wave composite imaging method based on Mach cone effects. Through regulating an acoustic radiation force to excite a probe to be quickly focused on different longitudinal depths of a tissue, a quickly-moving shear wave source is formed, coherent interference happens to shear waves generated by multiple wave sources due to Mach cone effects, a large-range shear wave plane moving to two sides is formed, the shear wave propagation condition is monitored in an ultra high-speed and ultrasonic mode, the shear wave speed is predicted, a tissue shear modulus is inverted, and a tissue elastic graph is generated; speeds or directions of shear wave sources are regulated, different shapes of shear wave planes are formed, a shear wave plane with a different shape generates a different sub elastic graph, and the sub elastic graphs are weighted and composited to form a final elastic graph. The tissue can be induced to generate large displacement, the imaging area is expanded, the shear wave elastic imaging robustness is enhanced, different shapes of shear waves are formed, the sub elastic graphs formed by the different shapes of shear waves are weighted, the imaging noise can be reduced, and the shear wave elastic imaging quality can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of medical ultrasonic imaging, in particular to a multi-shape plane shear wave composite imaging method based on the Mach cone effect. Background technique [0002] The elasticity (hardness) of tissue is closely related to its pathological state, so elastography can provide an important basis for disease diagnosis. When diseases such as breast cancer, liver cancer, prostate cancer, and thyroid nodules occur, tissue elasticity usually changes. [0003] According to different tissue excitation methods and response detection methods, a variety of elastography methods including quasi-static compression elastography and acoustic radiation force pulse elastography have been proposed. Among them, quasi-static compression elastography uses a probe to statically press tissue, and generates tissue relative elasticity maps by detecting tissue deformation, but quasi-static compression elastography has obvious artifacts...

AI Technical Summary

Problems solved by technology

[0008] The inventors of the present invention have found through research that although the existing shear wave elastography overcomes the shortcomings of quasi-static compression elastography that is limited to superficial organs and acoustic radiation force pulse elastography only detects the relative elasticity of focal tissue, it can provide Quantitative elastic parameter values ​​of internal organs, but there are still the following deficiencies: 1. For safety reasons, the excitation intensity of the acoustic radiation force is limited, and it is impossible to generate a large shear wave, so the induced tissue displacement is small and the detection is difficult; 2. The shear wave attenuates quickly during the propagation process, the imaging area is limited, and the image noise in the area far from the focus area is large; 3. The elasticity of the tissue is imaged by the shear wave generated by a single shear wave source, and the robustness is poor. Difficult to generate reliably high-quality elastic maps

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