超声成像中盲反卷积的通用系统函数的研究

Research of Uniform System Function in Blind-deconvolution of Ultrasound Imaging

目的:研究超声成像的盲反卷积中如何选取与组织无关的通用系统函数。方法:选用高阶谱分析的方法(双频倒谱法)进行纵向、横向二维系统函数辨识,估计出与组织无关的超声系统函数,并根据分辨率增益、中心频率、带宽等参数选取通用系统函数。结果:将通用系统函数应用于同设备产生的任意图像信号的反卷积处理中,能取得更好的分辨率增益。结论:本法估计出的与组织无关的超声系统函数,纠正了以往组织相关的反卷积处理模式的根本性弊端,并使得超声成像在线反卷积成为可能。

Objective To estimate uniform system function（SF） in the blind-deconvolution of ultrasound imaging.Methods Higher-order spectral analysis（Dual-frequency cepstrum） was employed to estimate axial and lateral two-dimension SF,which was tissue-independent,and then the uniform system function was chosen according to resolution gain,center frequency and bandwidth.Results Applying uniform system function to any image signal deconvolution generated by the same device could obtain better resolution gain.Conclusion The estimated tissue-independent ultrasound SF corrects the conventional tissue-dependent deconvolution process.The method makes it possible to conduct on-line decovolution of ultrasound imaging.