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

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.