title: Barker-coded excitation in ophthalmological ultrasound imaging.
abstract: High-frequency ultrasound is an attractive means to obtain fine-resolution images of biological tissues for ophthalmologic imaging. To solve the tradeoff between axial resolution and detection depth, existing in the conventional single-pulse excitation, this study develops a new method which uses 13-bit Barker-coded excitation and a mismatched filter for high-frequency ophthalmologic imaging. A novel imaging platform has been designed after trying out various encoding methods. The simulation and experiment result show that the mismatched filter can achieve a much higher out signal main to side lobe which is 9.7 times of the matched one. The coded excitation method has significant advantages over the single-pulse excitation system in terms of a lower MI, a higher resolution, and a deeper detection depth, which improve the quality of ophthalmic tissue imaging. Therefore, this method has great values in scientific application and medical market.
authors.affiliation: Institute of Biomedical Engineering Chinese Academy of Medical Sciences Tianjin 300192, China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Zhou
authors.affiliation: Institute of Biomedical Engineering Chinese Academy of Medical Sciences Tianjin 300192, China.
authors.forename: Xiao-Chun
authors.initials: XC
authors.lastname: Wang
authors.affiliation: Institute of Biomedical Engineering Chinese Academy of Medical Sciences Tianjin 300192, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.affiliation: Institute of Biomedical Engineering Chinese Academy of Medical Sciences Tianjin 300192, China.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Ji
authors.affiliation: Institute of Biomedical Engineering Chinese Academy of Medical Sciences Tianjin 300192, China.
authors.forename: Yan-Qun
authors.initials: YQ
authors.lastname: Wang
keywords: Barker; decoded compression; excitation imaging; ultrasound