Ultrafast composite plane wave imaging method based on broadband acoustic metamaterial

Abstract

The invention discloses an ultrafast composite plane wave imaging method based on a broadband acoustic metamaterial. The method is implemented through an ultrafast composite plane wave imaging device.The device comprises a transmission-receiving ultrasonic probe and an acoustic metamaterial structure. The method comprises the steps that the transmission-receiving ultrasonic probe is controlled togive out an ultrasonic signal at a preset transmission frequency and a first preset transmission angle; the preset transmission frequency is equal to a response frequency of the acoustic metamaterialstructure; the transmission-receiving ultrasonic probe is controlled to receive an echo signal reflected by a measured object at a preset receiving frequency and at a first preset receiving angle ora second preset receiving angle or a third preset receiving angle separately; the preset receiving frequency is n times of the preset transmission frequency; the first preset receiving angle is equalto the first preset transmission angle, the second preset receiving angle is smaller than the first preset transmission angle, and the third preset receiving angle is larger than the first preset transmission angle; the echo signal is adopted for reestablishing an image of the measured object. According to the method, the imaging depth and imaging quality can be improved.

Description

Technical field [0001] The invention relates to the technical field of ultrafast plane wave imaging, in particular to an ultrafast composite plane wave imaging method based on broadband acoustic metamaterials. Background technique [0002] At present, the evaluation criteria for medical ultrasound images mainly focus on two aspects: imaging depth and imaging quality. [0003] In terms of imaging quality, the emergence of ultrafast plane waves has revolutionized the field of medical imaging. The imaging frame rate can reach thousands, which greatly improves the frame rate of conventional ultrasound imaging. Compared with the line-to-line focused imaging method of conventional ultrasound imaging, ultrafast plane wave imaging uses a surface-to-surface non-focus imaging method. The non-focused transmit / receive mode is the key to ultrafast plane wave imaging. In 2002, Tanter et al. measured the shear wave velocity based on ultrafast plane wave imaging and proposed instantaneous elasto...

AI Technical Summary

Problems solved by technology

In 2015, the Tanter team expanded the composite imaging method and proposed an ultra-fast multi-wave imaging method that does not need to compromise the frame rate and can improve the image signal-to-noise ratio. its clinical application

However, the development of acoustic metamaterials is still in the low-frequency stage, and the research on high-frequency metamaterials is still in the exploratory stage.

[0005] In summary, the existing ultrafast plane wave imaging method is based on coherent composite plane wave imaging. Due to the non-focusing characteristics of plane waves, energy is lost and affects imaging depth and imaging quality.

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