An Approach to Tissue Characterization Based on Wave Theory Using a New Velocity Analysis Technique

In this paper we will discuss an approach to tissue characterization which was developed within our group. First our approach will be outlined.One of the basic steps we use here is a high resolution Synthetic Focusing procedure (Berkhout et al.,1982). For this procedure, and also for tissue characterization itself, correct knowledge of the sound propagation velocity is essential. In the second part of this paper a method will be put forward to determine values of the sound propagation velocity with little prior knowledge of the medium.This method is based on the minimization of the entropy of the synthetically focused image. Now an optimally focused image can be produced,which may be analysed in detail.In the final part of this paper we will discuss a method of analysis,based on two dimensional Fourier transformation of the r.f.data of part of the image.