Ultrafast Composite Plane Wave Imaging Method Based on Broadband Acoustic Metamaterials

Abstract

The invention discloses an ultrafast composite plane wave imaging method based on a broadband acoustic metamaterial. The method is realized by an ultrafast composite plane wave imaging device; the device includes a transmitting and receiving ultrasonic probe and an acoustic metamaterial structure. and Respectively receive the echo signal reflected by the measured object at the first preset receiving angle, the second preset receiving angle and the third preset receiving angle; the preset receiving frequency is n times the preset transmitting frequency; the first preset receiving The angle is equal to the first preset transmitting angle, the second preset receiving angle is smaller than the first preset transmitting angle, and the third preset receiving angle is larger than the first preset transmitting angle; the echo signal is used to reconstruct the image of the measured object. The invention can improve imaging depth and imaging quality.

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 imaging depth and imaging quality. [0003] In terms of imaging quality, the emergence of ultrafast plane waves has revolutionized the field of medical imaging, and the imaging frame rate can reach thousands, which greatly improves the frame rate of conventional ultrasound imaging. Compared with the line-to-line focusing imaging method of conventional ultrasound imaging, ultrafast plane wave imaging adopts a surface-to-surface non-focusing imaging method. Unfocused transmit / receive modes are 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 transient elastograp...

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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