Science Letters:A new coding scheme in coded ultrasound using staggering repetition interval  

作　　者：Cheng JIN Si-ping CHEN Zheng-di QIN 

机构地区：[1]School of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou 310027, China [2]School of Medicine, Shenzhen University, Shenzhen 518060, China [3]Nokia Corporation, Tampere 33100, Finland

出　　处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2009年第8期1213-1216,共4页浙江大学学报（英文版）A辑（应用物理与工程）

基　　金：Project (Nos.60772147 and 60871060) supported by the National Natural Science Foundation of China

摘　　要：The increase of frame rate,though with the potential in a coded ultrasound system,is generally concomitant with the simultaneous transmission of a number of apertures,and in consequence leads to increased cross-talks between different apertures.In view of this,a new coding scheme using staggering repetition interval was proposed.The transmitting signals were constructed by repeating the two(or more) modulated codes using staggering repetition interval,and then allocated to and transmitted simultaneously among different apertures.The decoding process was based on the subsection-matched filter under the assistance of different matched filters for different apertures.At last the outputs of subsection-matched filtering were added together.Staggering changed the positions of cross-correlation(CC) peaks from coinciding,which resulted in an effective reduction of CC.Our theoretical analysis and simulations showed that,the coding scheme can be used to reduce cross-talk,and a good cross-talk reduction will be achieved if the staggering delay is kept in an appropriate range.The increase of frame rate, though with the potential in a coded ultrasound system, is generally concomitant with the simultaneous transmission of a number of apertures, and in consequence leads to increased cross-talks between different apertures. In view of this, a new coding scheme using staggering repetition interval was proposed. The transmitting signals were constructed by repeating the two （or more） modulated codes using staggering repetition interval, and then allocated to and transmitted simultaneously among different apertures. The decoding process was based on the subsection-matched filter under the assistance of different matched filters for different apertures. At last the outputs of subsection-matched filtering were added together. Staggering changed the positions of cross-correlation （CC） peaks from coinciding, which resulted in an effective reduction of CC. Our theoretical analysis and simulations showed that, the coding scheme can be used to reduce cross-talk, and a good cross-talk reduction will be achieved if the staggering delay is kept in an appropriate range.

关 键 词：Coded ultrasound Frame rate Cross-correlation （CC） Staggering Ultrasonic imaging 

分 类 号：TN919.31[电子电信—通信与信息系统] P315.2[电子电信—信息与通信工程]