Haider B, Lewin P A, Thomenius K E
Department of Electrical and Computer, Drexel University, Philadelphia, PA 19104, USA.
IEEE Trans Ultrason Ferroelectr Freq Control. 1998;45(1):98-113. doi: 10.1109/58.646915.
Range sidelobe artifacts which are associated with pulse compression methods can be reduced with a new method composed of pulse elongation and deconvolution (PED). While pulse compression and PED yield similar signal-to-noise ratio (SNR) improvements, PED inherently minimizes the range sidelobe artifacts. The deconvolution is implemented as a stabilized inverse filter. With proper selection of the excitation waveform an exact inverse filter can be implemented. The excitation waveform is optimized in a minimum mean square error (MMSE) sense. An analytical expression for the power spectrum of the optimal pulse is presented and several techniques to numerically optimize the excitation pulse are shown. The effects of PED are demonstrated in computer simulations as well as ultrasonic images.
与脉冲压缩方法相关的距离旁瓣伪像可以通过一种由脉冲展宽和反卷积（PED）组成的新方法来减少。虽然脉冲压缩和PED在提高信噪比（SNR）方面效果相似，但PED本质上能将距离旁瓣伪像最小化。反卷积通过一个稳定的逆滤波器来实现。通过适当选择激励波形，可以实现精确的逆滤波器。激励波形在最小均方误差（MMSE）意义下进行优化。给出了最优脉冲功率谱的解析表达式，并展示了几种数值优化激励脉冲的技术。PED的效果在计算机模拟以及超声图像中得到了验证。
