针对超声成像系统逐点聚焦在工程实现中存储量大的缺点,提出一种动态聚焦最优分段方法.首先根据给定的聚焦延时约束误差进行几何分段,然后依据聚焦通道数和采样率计算各分段的位置序数和相应的聚焦延时参数,最后通过动态调整折线逼近单位实现对各个通道的聚焦延时误差的进一步优化.在此基础上,提出了与之相应的聚焦延时参数的压缩存储与实时生成方法.为了验证该方法的有效性,进行了聚焦误差分析和点目标成像实验.实验数据分析与测试结果表明:所提出的方法可以对全程探测范围内的动态聚焦进行最优分段,并将各通道的聚焦延时误差限定在约束误差范围内,且其成像效果与逐点聚焦成像效果基本一致,结构相似性指标达到0.9477.%According to the difficulty of dynamic focusing in ultrasound system,an optimal segmentation method for dynamic focus is proposed. Firstly,according to the given error constraints,the geometrical segmentation positions are calculated. Secondly,based on the focusing channels and the sampling frequency,the number of segmentation positions for focusing channels and the focus delays of each channel can be obtained. Then optimizing the focusing error of each channel is implemented by dynamically changing the quantization unit. Correspondingly,the hardware scheme of the focus delays compression and generation are put forward. In order to verify the validity,the focusing error analysis and point target imaging experiment are conducted. The numerical analysis and experimental results indicate the proposed approach can obtain the optimal segmentations and the focusing errors are limited to the given error constraints. The Structural Similarity of imaging results between the proposed approach and the ideal focusing method is 0.9477.
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