Shear wave attenuation coefficient measuring method and system

A technology of attenuation coefficient and measurement method, which is applied in the direction of measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of measurement failure and ultrasonic detection method can not penetrate, and achieve the effect of avoiding measurement failure

Active Publication Date: 2020-09-08
MARVEL STONE HEALTHCARE CO LTD
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Problems solved by technology

[0014] The embodiment of the present invention provides a method and system for measuring the shear wave attenuation coefficient, which solves the problem that the ultrasonic detection method cannot penetrate certain media and cause measurement failure

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  • Shear wave attenuation coefficient measuring method and system
  • Shear wave attenuation coefficient measuring method and system
  • Shear wave attenuation coefficient measuring method and system

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Embodiment Construction

[0056] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0057] Embodiments of the present invention provide a method and system for measuring shear wave attenuation coefficients, which are used to solve the problem in the prior art that ultrasonic testing methods cannot penetrate certain media and cause measurement failures. Wherein, the method and the system are based on the same inventive concept, and since the principles of the method and the device to solve problems are similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

[0058] A plurality referred to in the present in...

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Abstract

The embodiment of the invention relates to a shear wave attenuation coefficient measurement method and system, and solves a problem of measurement failure caused by the fact that an ultrasonic detection method cannot penetrate through some media. The shear wave attenuation coefficient measuring method comprises the following steps of applying a nuclear magnetic resonance pulse sequence to a measured object with a stable vibration state, performing motion coding in cooperation with a static or controllable gradient magnetic field to detect nuclear magnetic resonance echo signals of at least twodifferent positions of the measured object, and analyzing and processing the nuclear magnetic resonance echo signals to obtain a shear wave attenuation coefficient; the system comprises a magnetic resonance system, a mechanical vibration excitation device and a nuclear magnetic resonance console. The method is advantaged in that the attenuation coefficient of the solid or semi-solid is measured in a non-invasive and non-destructive manner based on low-field nuclear magnetic resonance.

Description

technical field [0001] Embodiments of the present invention relate to a method and system for measuring a shear wave attenuation coefficient. Background technique [0002] The attenuation coefficient is also called the attenuation constant. is the real part of the propagation coefficient. It consists of two parts: classical absorption and molecular absorption. Classical absorption is the dissipation of sound energy due to the viscosity of the air, heat conduction effects, and the rotation of air molecules. Its magnitude is proportional to the square of the sound wave frequency and is related to air temperature and air pressure. Generally, this absorption can be ignored. . Molecular absorption is mainly caused by the vibrational relaxation effect of oxygen and nitrogen molecules in the air. It is closely related to the temperature and humidity of the air, and also changes with the increase or decrease of the sound wave frequency, but the change law is more complicated. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/02
CPCG01H11/02
Inventor 吴子岳王伟谦罗海陈潇叶洋
Owner MARVEL STONE HEALTHCARE CO LTD
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