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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

  • 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。

     

    Abstract: 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.

     

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