title: Methods of analysis for backscattering from tissues.
abstract: Two techniques for tissue characterization by ultrasonic analysis are described. In the first, using narrow-band pulses, the angular variation I (theta) of the ultrasonic intensity back-scattered by vegetal or animal targets is analysed. We examine how it is possible to estimate the surface roughness and the average spatial periodicity d characteristic of the tissues, by calculating the Fourier transform or the autocorrelation function of I (theta). In the second technique the sample is insonified with a broadband pulse at a fixed angle. A value of the mean periodicity can be obtained directly from the frequency spectrum of the echo for tissues of fairly regular structure.
mesh_terms: D000818:Animals; D002645:Chickens; D005583:Fourier Analysis; D005895:Gizzard, Avian / Q000033:anatomy & histology; D008099:Liver / Q000033:anatomy & histology; D008962:Models, Theoretical; D010507:Periodicity; D013057:Spectrum Analysis / Q000379:methods*; D013552:Swine; D014465:Ultrasonics / Q000379:methods*; D014463:Ultrasonography