Ultrasound inverse scattering determination of speed of sound, density, and absorption

This paper presents a method of determining three intrinsic mechanical parameters of an unknown object in the framework of ultrasound inverse scattering tomography. Those parameters are the speed of sound, density, and absorption whose values are given as the solution of an inhomogeneous Helmholtz wave equation. Computer simulations are carried out using the sinc basis moment method and Newton-Raphson method in an measurement configuration where the object is insonified by an incident plane wave over 360° and the scattered field is collected by detectors arranged in a rectangular fashion around it. Two distinct frequencies are used to separate each parameter of three Gaussian objects that are either overlapped at the same location or separately positioned from each other. The density turns out to be rather difficult to reconstruct as compared with the other two parameters