北京生物医学工程

Chirp编码激励磁声成像信号处理方法研究

Research on signal processing method of Chirp coded excitation for magneto-acoustic imaging

作者：张顺起张鑫山马任殷涛刘志朋

单位：中国医学科学院生物医学工程研究所（天津300192）

关键词：磁声成像; Chirp信号; 编码激励; 脉冲压缩; 信噪比

分类号：R318.04

出版年·卷·期（页码）：2019·38·6（611-616）

摘要：

目的磁声信号信噪比低限制了磁声成像的图像质量，本研究提出Chirp脉冲编码激励的磁声成像信号处理方法，以提高磁声信号信噪比，缩短信号处理时间。方法本研究通过仿真计算和磁声信号的实验测量，对不同脉冲宽度的Chirp信号编码激励的磁声信号进行了研究。结果对于体外实验猪肉与金属丝模型，编码激励明显提高磁声信号信噪比，10 μs、50 μs、100 μs的Chirp激励，磁声信号信噪比相比于单脉冲激励分别提高7.65倍、42倍和90.1倍。同时处理时间明显缩短，100 μs的Chirp激励下处理时间相比于单脉冲平均方法处理时间缩短为原来的1.2 %。结论本研究的脉冲编码处理方法对于提高磁声信号信噪比，改善成像质量，提高整体成像效率，具有重要意义。

Objective The low signal-to-noise ratio (SNR) of magneto-acoustic signals limits the image quality of magneto-acoustic imaging. A Chirp coded excitation signal processing method for magneto-acoustic imaging is proposed in this paper. The SNR of magneto-acoustic signal is improved and the signal processing time is shortened by using this approach. Methods In this paper, Chirp coded excitation for magneto-acoustic signals under different pulse widths are studied by simulation and experimental measurement. Results The SNRs of magneto-acoustic signals are increased by 7.65 times, 42 times, and 90.1 times under 10μs, 50μs and 100μs Chirp excitation respectively, for the pork and wire sample. At the same time, the processing time is significantly shortened to 1.2% of the average method under the single pulse excitation. Conclusions The pulse coding method is of great significance to improve the SNR of magneto-acoustic signals, image quality and imaging efficiency.

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