Title :
Ultrasound inverse scattering determination of speed of sound, density, and absorption
Author :
Kwon, Sung-Jae ; Jeong, Mok-Kun
Author_Institution :
Dept. of Electron. & Commun. Eng., Daejin Univ., Kyunggi, South Korea
Abstract :
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
Keywords :
Helmholtz equations; Newton-Raphson method; acoustic tomography; bioacoustics; biological tissues; biomechanics; biomedical ultrasonics; density; image reconstruction; inverse problems; medical image processing; method of moments; ultrasonic absorption; ultrasonic velocity; Gaussian objects; Newton-Raphson method; Taylor series; absorption; biological tissue; computer simulations; density; finite difference approximation; image reconstruction; inhomogeneous Helmholtz wave equation; intrinsic mechanical parameters; rectangular arranged detectors; sinc basis moment method; speed of sound; ultrasound inverse scattering tomography; unknown object; Absorption; Acoustic scattering; Computer simulation; Inverse problems; Moment methods; Newton method; Partial differential equations; Tomography; Ultrasonic imaging; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1998. Proceedings., 1998 IEEE
Conference_Location :
Sendai
Print_ISBN :
0-7803-4095-7
DOI :
10.1109/ULTSYM.1998.765258