STUDIES ON ULTRASONIC SCATTERING FROM QUASI-PERIODIC STRUCTURES

This study extends the work done on nonuniform phase statistics by inc luding additional results based on quasi-periodic scattering. Three pa rameters are used to predict the presence of regular structure within the region of interest. The signal-to-noise ratio of phase and the chi (2) statistic resulting from conducting a goodness of fit test are two parameters used to verify whether the phase signal followed a uniform distribution. A third parameter, the power spectral density (PSD), wa s studied and its ability to provide information on the level of perio dicity present was analyzed. Computer simulations and experiments on t issue mimicking phantoms were carried out, the results of which indica te that the parameters introduced in this paper have good potential in providing a better understanding of scattering from a collection of q uasi-periodic scatterers.