超声成像系统的动态孔径控制方法

The method of dynamic aperture control technology based on ultrasound imaging system

动态孔径控制技术是超声成像系统的一个重要环节,良好的动态孔径控制技术能够有效地改善图像质量。在深入分析超声信号的合成波束分布规律的基础上,提出一种能够消除聚焦波束扫描死区的动态孔径控制方法。该方法根据探头阵元数对探测区域进行均匀的区域分割,计算得到完全覆盖相邻两条扫描线之间区域的聚焦波束在该深度下所需的波束宽度,再根据不同探测深度的波束宽度反推该深度下所需的孔径大小。该方法不受探头参数特性改变,以及探测对象变化的影响,在超声成像系统具有普遍适用性。仿真成像表明:采用该动态孔径控制方法能够有效提高超声图像的整体质量。

Dynamic aperture control technology is one of the most important parts in ultrasonic imaging system.Excellent control technology of dynamic aperture can effectively improve the quality of ultrasonic imaging.Based on deep analysis of ultrasonic beam distribution,a control method for dynamic aperture which can eliminate the scanning dead zone of focused beam is presented.The detection region is even divided according to the number of probe array elements.The desired focused beam width is calculated between the next two scan lines at different depths,and then according to the beam width,the required aperture size for different depths is determined.The method is not affected by the probe parameters or detection objects,and it can be widely employed in ultrasonic imaging system.The simulation experiments indicate that the proposed method can effectively improve the whole quality of ultrasonic imaging.