论文部分内容阅读
针对超声激励成像一直受“多径反射干扰”的影响,消除多径伪影的相关算法一直未能有所突破的问题,设计了一个超声激励成像的仿真软件,为消除多径干扰的算法研究提供条件。仿真软件设计的难点在于多重反射路径的快速准确计算。通过研究,采用改进的Cyrus-Beck算法确定声传播轨迹与各个边界的交点和反射路径,能更有效快捷地进行声传播轨迹的解算,编程实现上也大大减少了代码量。结果表明:仿真软件可以较好地仿真超声激励成像过程,得到的接收信号能较好地反应多径反射情况,为研究消除多径干扰的算法奠定了重要基础。将仿真信号与Greenleaf团队用物理实验获取的信号进行对比,两信号波形非常相似,验证了该仿真软件的有效性。
In view of the fact that the ultrasonic imaging has been affected by “multipath reflection interference ” and the algorithm of eliminating multipath artifacts has been unable to make any breakthrough, a simulation software of ultrasonic excitation imaging has been designed. In order to eliminate multipath interference Algorithm research provides the conditions. The difficulty of simulation software design is the fast and accurate calculation of multiple reflection paths. Through the research, the modified Cyrus-Beck algorithm is used to determine the intersection point and reflection path of the sound propagation trajectory and each boundary, so that the solution of the sound propagation trajectory can be solved more efficiently and effectively, and the amount of code can be greatly reduced in programming. The results show that the simulation software can simulate the process of ultrasonic excitation imaging well, and the received signal can reflect the situation of multipath reflection well, which lays an important foundation for the research on the algorithm of eliminating multipath interference. The simulated signal is compared with the signals obtained by the Greenleaf team with physical experiments. The two signal waveforms are very similar, which verifies the validity of the simulation software.