一种融合动态孔径的聚焦延迟参数压缩方法  

Focus delay parameter compression method combined with dynamic aperture control

作　　者：王平[1] 邹强鑫[1] 王林泓[2] 王思奇[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401331

出　　处：《仪器仪表学报》2013年第9期2080-2086,共7页Chinese Journal of Scientific Instrument

基　　金：中央高校基本科研业务费科研专项(CDJZR11150004)资助项目

摘　　要：针对逐点动态聚焦延迟数据存储量大的问题,提出了一种融合动态孔径的聚焦延迟参数压缩方法。该方法在相对声程差的基础上,结合动态孔径控制方法,通过存储各阵元的相应开启位置、开启位置对应的初始数据及各阵元数据发生递减的位置序号,可实现逐点动态聚焦的延迟参数的压缩存储。对于聚焦过程而言,在进行动态孔径控制的同时,对存储值进行解压处理,实时地生成各阵元对应聚焦延迟参数,即可用于有效的逐点动态聚焦。本文采用32通道128阵元凸阵探头进行仿真实验,并对其展开相应的计算与推导。实验结果表明:所提出的压缩存储方法不仅实现动态孔径与逐点动态聚焦的有机融合,更是大幅度地提高了聚焦延迟参数的压缩效率,有效提高了成像质量。Aiming at the large storage capacity problem of point to point dynamic focus delay data, a focus delay pa- rameter compression method combined with dynamic aperture is put forward. On the basis of relative acoustic path difference and dynamic aperture control, the compression storage of point to point dynamic focus delay parameters is accomplished by storing the channel-opening positions, its quantized initial values and the position ordinal numbers when the channel data decreasing happens ; and the compression storage of the point to point dynamic focus delay pa- rameters is achieved. In the process of focusing, the stored data are decompressed with dynamic aperture control, the focus delay parameters of the channels are generated in real time, which can be used in the effective point to point dynamic focusing. A 32-channel 128-element convex array of transducers was used to carry out simulation experi- ment;and the related mathematical derivation and calculation were performed. The experimental results indicate that the proposed compression storage method can not only achieve the organic integration of point to point dynamic focus and dynamic aperture control, but also greatly improve the compression efficiency of the focus delay parameters;and effectively improves the imaging quality.

关 键 词：超声成像 逐点动态聚焦 动态孔径 相对声程差 压缩存储 

分 类 号：TB553[理学—物理]