Optimal ultrasonic array focusing in attenuative media.

Authors :: Ganguli A
Gao RX
Liang K
Jundt J
Source :: Ultrasonics [Ultrasonics] 2011 Dec; Vol. 51 (8), pp. 911-20. Date of Electronic Publication: 2011 May 25.
Publication Year :: 2011
Abstract: This paper presents a parametric study on the efficiency of ultrasound focusing in an attenuative medium, using phased arrays. Specifically, an analytical model of ultrasound wave focusing in a homogeneous, isotropic and attenuative fluid with point sources is presented. Calculations based on the model have shown that in an attenuative medium, an optimum frequency exists for the best focusing performance for a particular size of aperture and focal distance. The effect of different f numbers on the focusing performance in the attenuative medium is further investigated. The information obtained from the analytical model provides insights into the design and installation of a phased transducer array for energy efficient wave focusing.<br /> (Copyright © 2011 Elsevier B.V. All rights reserved.)