Elastography Method Based on Focused Ultrasonic Acoustic Signals

Abstract

The invention relates to an elastic imaging method based on focused ultrasonic acoustic vibration signals. The imaging system used includes a signal generator, an ultrasonic pulse transceiver, a power amplifier, an excitation probe, a tracking probe, a data acquisition card, a computer and a motion controller. By exciting the excitation probe, it generates ARF in the focus area, causing the vibration of the medium in the focus area, and then emits the secondary ultrasonic wave, detects the amplitude information of the secondary ultrasonic wave, evaluates the elastic characteristics of the medium, moves the excitation probe, and makes it scan the entire object. Measure the object field and reconstruct the elastic distribution of the medium.

Description

Technical field[0001]The present invention belongs to the field of ultrasonic elastic imaging, and the secondary ultrasonic signal detecting medium elastic characteristics using the focus ultrasonic radiation force excitation, and the method of reconstructing the dielectric elastic distribution, particularly an elastic imaging method based on the focus ultrasonic resonance signal.Background technique[0002]The elasticity characteristics of the biological tissue are inherent mechanical properties in the organism. There are differences in the elastic properties of each part in the human body (especially the lesion tissue), and some pathological phenomena and physiological activities will cause changes in the elasticity of biological tissue. Therefore, biological organizations carry rich physiological and pathological information. Palpation is one of the most traditional methods for diagnosing the elasticity of biological tissue, which is simple to operate, but the diagnosis results are...

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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 imaging; 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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