Subband characteristics of ultrasonic echo envelope

This paper studies subband characteristics of the backscattered ultrasonic echo. The backscattered ultrasonic echo from tissues is described in terms of Rayleigh distribution or K-distribution. Subband decomposition of ultrasonic echo envelope is modelled by a generalized Gaussian distribution (GGD). In regions of resolvable details, the subband statistics fits into the heavy-tail of the distribution while the tails decay at a faster rate in homogeneous regions. It is shown that the GGD model and its parameters are versatile in modelling the subband statistics of the backscattered envelope from tissues. Thus the GGD may provide a feasible model as a prior distribution to facilitate development of speckle reduction algorithms using subband decomposition.