Title :
Nonlinear Effects on Confocal-Beam Radiation-Force Imaging
Author :
Giannoula, A. ; Hatzinakos, Dimitrios ; Cobbold, Richard S. C.
Author_Institution :
Dept. of Electr. & Comput. Eng., Toronto Univ., Ont.
Abstract :
The dynamic acoustic radiation force produced by two confocal ultrasound beams, can be used for imaging the acoustic properties of tissue. In this paper we investigate how nonlinear propagation in an attenuating medium can affect image quality. Specifically, the effects of the second harmonic on the image formation process are studied, by means of the system point-spread-function (PSF). Incorporation of tissue nonlinearities in the model and extraction of higher-harmonic information, indicates that a more localized radiation force distribution and reduced sidelobe effects can be achieved and this could improve image resolution
Keywords :
biomedical ultrasonics; harmonic analysis; image resolution; medical image processing; ultrasonic propagation; confocal ultrasound beams; confocal-beam radiation-force imaging; dynamic acoustic radiation force; higher-harmonic information; image formation process; image quality; image resolution; nonlinear effects; nonlinear propagation; point-spread-function; Acoustic beams; Acoustic imaging; Acoustic propagation; Data mining; Elasticity; Focusing; Frequency; Image resolution; Ultrasonic imaging; Vibration measurement;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on
Conference_Location :
Toulouse
Print_ISBN :
1-4244-0469-X
DOI :
10.1109/ICASSP.2006.1660546
