Elastic characteristic detecting method based on focused ultrasonic acoustic vibration signal

Abstract

The invention relates to an elastic characteristic detecting method based on a focused ultrasonic acoustic vibration signal. An adopted detecting system comprises a signal generator, an ultrasonic pulse transceiver, a power amplifier, a stimulation probe, a tracking probe, an N1 collecting card and a computer. By stimulating the stimulation probe, ARF is generated on a focusing area, vibration ofa focusing area medium is caused, then secondary ultrasonic waves are emitted, amplitude information of the secondary ultrasonic waves is detected, and the elastic characteristic of a medium is evaluated.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic elastography, and relates to a method for detecting elastic properties of a medium by using secondary ultrasonic signals excited by focused ultrasonic acoustic radiation force, in particular to a method for detecting elastic properties based on focused ultrasonic acoustic vibration signals. Background technique [0002] The elastic properties of biological tissue are the inherent mechanical properties in the body. Different biological tissues (especially diseased tissues) have different elastic properties in different parts of the human body. Some pathological phenomena and physiological activities will cause changes in the elastic properties of biological tissues. Therefore, biological tissues carry a wealth of physiological and pathological information. Palpation is one of the most traditional methods for diagnosing the elastic properties of biological tissues. This method is simple and easy ...

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Problems solved by technology

It can be seen from the above steps that this method has many steps and takes a long time; since the displacement caused by this method is on the order of microns, this method requires a measurement system with a higher sampling frequency, or uses techniques such as upsampling to increase the amount of data; And the detection resolution depends on different algorithms, different parameter selection and other factors

However, the existing method based on harmonic ARF excitation directly detects the low-frequency sound waves excited by medium vibration. Because the sound wave frequency is very low and decays slowly, it has high resolution. However, in this method, the harmonic ARF needs to be composed of two Confocal ultrasonic transducers with a small frequency difference are generated by simultaneous excitation or amplitude modulation. The structure of the confocal ultrasonic transducer is complex, and the two beams of ultrasonic waves will generate standing waves during the propagation process, which will affect the accuracy of detection; use In the amplitude modulation method, energy modulation occurs across the entire surface of the sensor, and the oscillating ARF affects the surface of the sensor

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