医学高频超声编码成像中解码压缩技术的研究

The Research of Decoded Compression Arithmetic for Medical High-frequency Ultrasound Coded Excitation Imaging

将数字编码激励与现有眼科高频超声成像技术相结合,提出一种全新的高速数据检测和信号处理方法。由FPGA产生16位Golay互补序列,激励换能器产生超声波。数据采集电路实现了15 MHz高频超声回波信号的数字化,采样频率120 MHz,采样位数14 bits。解码压缩算法由FPGA实时实现,A序列解码和B序列解码交替进行,分别将回波信号与A,B解码序列卷积运算,两路延迟叠加即实现了Glayo码的实时解码压缩。实验表明,采用编码激励技术可以在保持发射电压和轴向分辨率的前提下,有效提升回波主瓣幅度,抑制旁瓣噪声,可有效提高信噪比。此法对于改善眼科超声图像质量,提高设备安全性等方面具有重要的应用价值。

This paper combined the coded excitation with the technique of ophthalmic high-frequency ultrasonic imaging, and raised a new high-velocity data detection and signal processing method. 16 bit Golay complementarity sequences were produced by FPGA, which excited the probe to produce ultrasonic waves. Data detection circuit achieved the digitalized of the 15 MHz high-frequency ultrasonic echo signals in real time. Sampling rate was 120MHz, and sampling bit was 14 bit. Decoded compression arithmetic was realized by FPGA in real time, in which A code compression was alternated with B code compression. The return echo was correlated with the corresponding decode filterA and filter B respectively, and then the echo was delayed and summed to complete the decoding process. The experiment indicated that coded excitation can effectively increase the range of mainlobe and decrease the range of sidelobe. This technique can effectively raise the signal-to-noise ratio, and has significant research value in advancing the ophthalmic ultrasonic image quality and raising the safety of the equipment.