Method and device of delay control for ultrasonic imaging

Abstract

The invention discloses a method and a device of delay control for ultrasonic imaging. The method includes steps of calculating an initial delay error generated if an ultrasonic wave in each channel arrives at an initial focus point of a corresponding scanning line in advance and calculating a relative value of a delay error between each focus point and a previous adjacent focus point on the same scanning line corresponding to each channel; accumulating to obtain the delay error of the focus point corresponding to each channel according to the initial delay errors calculated in advance and the relative delay errors calculated in advance of all focus points; adding each delay error and delay which is calculated according to sound velocity of a scanned object together to obtain real delay of the corresponding focus point corresponding to the corresponding channel; or respectively calculating delays in a probe matching layer and the scanned object, adding the delays together to obtain real delay, and then performing delay control to transmission and receiving of the ultrasonic wave by the aid of the real delay. Phase correction is realized by the delay control, delay of the ultrasonic wave of different channels arriving at the same focus point is more accurate, and imaging quality of an ultrasonic system is improved.

Description

technical field [0001] The present invention relates to an ultrasonic imaging control in a medical ultrasonic imaging system, in particular to an ultrasonic imaging delay control method in the beam forming process of the medical ultrasonic imaging system, and a control device using the control method. Background technique [0002] In a medical ultrasound imaging system, beamforming is the first step in digital domain processing, and the accuracy of the beamforming process greatly affects the subsequent processing and even the final imaging quality. The acquisition of in-phase data is the most important step in the beamforming process. For this reason, different ultrasound systems have performed various processes in order to obtain accurate channel data. For example, some systems obtain more precise data by increasing the sampling rate In the case of limited capacity, some systems use interpolation algorithms to approximately improve the delay accuracy. These methods have cer...

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Problems solved by technology

[0004] The present invention considers the phase difference caused by the difference between the acoustic characteristics inside the probe and the acoustic characteristics of the scanning object, and proposes an ultrasonic imaging delay control method and device to solve the problem of ultrasonic images being affected by the delayed phase error in the current ultrasonic imaging system quality problem

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