一种基于相对声程差的高精度逐点聚焦实现方法  

A high precision algorithm for dynamic focusing based on relative acoustic path difference in ultrasound imaging

作　　者：王平[1] 高阳[1] 范文政[1] 王林泓[2] 何为[1] 许琴[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]重庆电子工程职业学院,重庆400044

出　　处：《声学学报》2012年第5期508-515,共8页Acta Acustica

基　　金：广东省教育部产学研结合项目(2008B090500272);重庆大学研究生科技创新基金个人项目(CDJXS11150009);第四届国家大学生创新性实验项目(101061117)资助的课题

摘　　要：针对超声成像逐点聚焦延时参数容量大、工程实现困难的问题,提出一种基于相对声程差的高精度逐点聚焦实现方法。该方法对逐点聚焦延时参数进行分解,压缩存储,并在逐点聚焦过程中实时解压生成聚焦延时参数,用于高精度的逐点聚焦中。为了验证该方法,本文以128阵元16通道的凸阵探头为例,进行了相关的数学推导和证明。在此基础上,给出了基于FPGA(Field Programmable Gate Array)的高精度逐点聚焦模块的硬件实现原理框图,并对该逐点聚焦方法的性能进行了分析讨论,验证了该方法的优越性。Aiming at the problem of the extensive data storage and difficult to be implemented for dynamic receive focusing in ultrasound imaging, a method based on relative acoustic path difference is proposed. The core of this method is the decomposition and compression storage, and realization of high precision point-by-point focusing delay with realtime generation algorithm for focusing delay parameters. Take 16-channel 128-element convex array of transducers for example, the related mathematical derivation and the block diagram of point-by-point focusing module in FPGA （Field Programmable Gate Array） are given out. At last, the superiority of the proposed algorithm is analyzed and discussed.

关 键 词：聚焦方法 高精度 声程差 超声成像 工程实现 压缩存储 16通道 数学推导 

分 类 号：O426.9[理学—声学]