基于合成孔径技术的内镜超声相控阵成像算法  

Phased Array Imaging Algorithm for Endoscopic Ultrasound Based on Synthetic Aperture Imaging Technique

作　　者：张闯[1] 陈晓冬[1] 汪毅[1] 李莹[1] 焦志海[1] 郁道银[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院光电信息技术科学教育部重点实验室,天津300072

出　　处：《光学学报》2014年第12期90-94,共5页Acta Optica Sinica

基　　金：国家"十二五"科技支撑计划(2012BAI19B02)

摘　　要：利用孔径大小为2.32mm的16阵元换能器,搭建了一套16通道的内镜超声相控阵成像实验系统。在此基础上提出了一种适用于内镜成像的相控阵成像算法(PAI),该算法利用延时和叠加算法(DAS)取得扫描线数据,再利用合成孔径技术中的相干样点叠加,得到高分辨率图像。该相控阵成像算法实现了发射和接收的动态聚焦。经FieldII仿真和内镜探头超声成像实验验证,与延时和叠加算法以及动态接收聚焦算法(DRF)相比,图像的理论横向分辨率分别提高了93.68%和17.5%,实验获得的实际横向分辨率分别提高了92.78%和14.69%,验证了相控阵成像算法和实验系统的可行性。With a 16-element transducer whose aperture size is 2.32 mm, an experimental endoscopic ultrasonic phased array imaging system which has 16 channels is constructed. A novel phased array imaging algorithm （PAD is proposed. The algorithm applies the image lines obtained by the delay and sum algorithm （DAS） as input data, and takes advantage of the synthetic aperture imaging which picks out the coherent samples of the recorded echoes and sums these samples. The algorithm finally obtains a high resolution image. The algorithm is dynamically focused in both transmission and receiving. With FieldII, the results of simulation indicate that PAI can increase the lateral resolution by 93. 68% and 17. 5% respectively, compared with DAS and dynamic receiving focusing algorithm （DRF）. The experimental results indicate that PAI can increase the lateral resolution by 92. 78% and 14. 69% respectively, compared with DAS and DRF. The simulation and experiment finally verify the feasibility of the phased array imaging algorithm and the experimental system.

关 键 词：成像系统 超声成像 相控阵 合成孔径 动态聚焦 FieldII 

分 类 号：R197.39[医药卫生—卫生事业管理]