超声成像中基于虚拟阵元的双聚焦波束合成方法  

The method of dual focusing beamforming based on virtual element in ultrasound imaging

作　　者：王平[1] 高阳[1] 曹世超[2] 邹强鑫[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]邢台职业技术学院电气工程系,刑台054035

出　　处：《重庆大学学报（自然科学版）》2013年第5期75-79,共5页Journal of Chongqing University

基　　金：广东省教育部产学研结合项目(2008B090500272);重庆市科技攻关项目(2011GGC159)

摘　　要：针对传统动态接收聚焦DRF波束合成方法在超声成像中分辨率和探测深度方面存在的不足,提出一种基于虚拟阵元的双聚焦波束合成方法。首先利用单一固定焦点进行第一次聚焦;然后利用虚拟阵元的概念计算第二次聚焦的延时参数;最后再根据延时叠加波束合成的原理及动态聚焦技术进行第二次聚焦,得到最终成像的扫描线数据。为验证该方法的有效性,进行了点散射目标成像实验。实验结果表明:双聚焦波束合成的超声成像方法在一定程度上有效地调和了分辨率与探测深度之间的矛盾,提高了超声成像的质量。According to the resolution and investigation depth deficiency of traditional dynamic receiving focusing （DRF） beamforming in ultrasound imaging,a dual focusing beamforming method based on virtual element is proposed. Firstly, single fixed focus point is used in the first focusing; and then the delay parameters used in the second focusing are calculated with the concept of virtual element; in the end the second focusing is carried out by delay-and-sum dynamic focus technique to obtain the imaging data. The experiments based on point pattern are used to verify the proposed method. The experimental results indicate that dual focusing beamforming applied to ultrasound imaging can resolve the contradiction between resolution and investigation depth in some extent and the method of dual focusing beamforming can effectively improve the imaging quality.

关 键 词：波束合成 超声成像 双聚焦 延时叠加 

分 类 号：TB553[理学—物理]