Acoustic radiation force pulse elastic imaging method based on displacement attenuation characteristic

Abstract

The invention relates to an acoustic radiation force pulse elastic imaging method based on a displacement attenuation characteristic. A measurement system of the method mainly comprises a signal generator, an ultrasonic pulse transceiver, a radio frequency power amplifier, an excitation probe, a tracking probe, a data acquisition and processing system and a stepping motor; the excitation probe isused for generating acoustic radiation force and exciting a medium to generate displacement response, and an excitation signal of the probe is generated by the signal generator and is amplified by theradio frequency power amplifier; the tracking probe is excited by the ultrasonic pulse transceiver, and is used for receiving radio frequency echo signals before and after acoustic radiation force excitation, the data acquisition and processing system is used for acquiring and processing the echo signals, calculating displacement response of the medium due to acoustic radiation force excitation,and evaluating elastic characteristics of the medium; and the stepping motor is used for moving the tracking probe, so that the tracking probe detects the lateral direction, and the elastic distribution of a measurement area is reconstructed.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic elastography, and relates to utilizing the attenuation characteristic of displacement in the lateral direction to reconstruct the distribution of elastic properties of the medium by compensating the attenuation of displacement caused by shear waves in the process of medium propagation, effectively reducing the number of excitations of the excitation probe, and further Improving imaging efficiency, especially an acoustic radiation force pulse elastography method based on displacement attenuation properties. Background technique [0002] During the propagation of ultrasonic waves in the medium, the energy density changes due to the effects of absorption and scattering, thereby generating acoustic radiation force. When the acoustic radiation force acts on the medium with elastic properties, it will produce axial compression and stretching, and then produce displacement, and at the same time genera...

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Problems solved by technology

[0010] In the existing ultrasonic elastography method using acoustic radiation force excitation, the medium is excited by the acoustic radiation force generated by focused ultrasonic waves, and the response of the focused area is detected, which can only evaluate the elastic characteristics of the focused area, and it is necessary to control the focused ultrasonic transducer Only by moving the sensor to scan the measured object field can the elastic distribution of the entire measured object field be reconstructed, and the efficiency is low

However, in the SWEI method, information such as shear wave velocity is calculated by using the time information of the displacement generated in the lateral direction, and the elastic distribution of the measurement area is reconstructed. Low

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