Synthetic aperture ultrasonic imaging method with function of movement compensation

Abstract

The invention relates to a synthetic aperture ultrasonic imaging method with a function of movement compensation, and the method is used in a synthetic aperture ultrasonic energy converter array with N array elements, wherein the intervals among all array elements are equal, and all array element can emit signals and receive signals. The method comprises the steps: obtaining a first low-resolution scanning line in a linear scanning mode that a single focus is employed for transmission and receiving and a transmission focus and a receiving focus are the same; obtaining a movement estimation scanning line in a mode of employing an offset array element for receiving; carrying out estimation through employing the movement estimation scanning line, wherein an obtained estimation value is used for the compensation of the first low-resolution scanning line; obtaining second low-resolution scanning lines; enabling corresponding sampling points on other second low-resolution scanning lines in a virtual source opening angle to be multiplied by a weighted value, and then to be added to corresponding sampling points on the second low-resolution scanning lines corresponding to virtual sources; obtaining a high-resolution scanning line, and obtaining a high-resolution image. The virtual source is emission focuses of all array elements in the synthetic aperture ultrasonic energy converter array.

Description

technical field [0001] The invention relates to the field of synthetic aperture imaging, in particular to a synthetic aperture ultrasonic imaging method with motion compensation. Background technique [0002] The synthetic transmit aperture is transmitted by a single array element, received by a full aperture, and a low-resolution image (LRI) is obtained through beamforming, and a high-quality image (HRI) is obtained by coherently adding the LRI obtained by all transmit array elements. Because HRI achieves dynamic focusing on both transmission and reception, it has higher resolution than traditional ultrasound imaging methods. However, this synthetic transmit aperture imaging method faces three main problems: 1) poor penetration and low signal-to-noise ratio of echo signals caused by single-array emission; 2) motion between low-resolution images will reduce their coherence, thus 3) In the process of system implementation, a large number of radio frequency echo (RF) lines ne...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of poor imaging quality in the prior art when there is axial displacement, so as to provide a method for obtaining high-resolution images without increasing the number of shots.

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