高帧率超声成像系统中一种高质量成像模式的实现

为解决高帧率(high frame rate,HFR)成像系统在通过一次发射事件成像时成像质量不够理想的问题,提出了一种以降低HFR成像系统的帧频为代价来换取高质量成像的方法.首先给出了一个更一般化的HFR成像模型,成像过程中选择不同参数的阵列波作为发射信号,一次发射事件得到一幅图像频谱,然后把数次发射事件得到的图像频谱用平均的方法合成为一帧图像频谱,最后通过Fourier变换重建图像.仿真结果表明该方案提高了成像的频谱范围,降低了成像的旁瓣幅度,从而得到了高质量的成像,并保证了较高的系统帧率.

Implementation of High Quality Imaging Mode in the High Frame Rate Ultrasonic Imaging System

The poor image quality in the high frame rate (HFR) ultrasonic imaging system is due to the fact that only one transmission event is used for constructing images. In order to solve this problem, a solution is presented, which achieves high quality imaging at the cost of reducing frame rate. In the solution, a more general HFR model is developed. In the imaging process, the array beam with different parameters is used as transmitted signal, and the image spectrum is obtained. Several image spectra related to different transmit events are synthesized to form one frame of image spectrum. The simulation result shows that the solution increases the spectrum range of an image and suppresses its sidelobe,thus achieving high quality image while maintaining a relatively high frame rate.