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Content Provider | IEEE Xplore Digital Library |
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Author | Sua Bae Tai-Kyong Song Jin Ho Chang |
Copyright Year | 2014 |
Description | Author affiliation: Dept. of Electron. Eng., Sogang Univ., Seoul, South Korea (Sua Bae; Tai-Kyong Song; Jin Ho Chang) |
Abstract | Shear wave (SW) elasticity imaging is based on the estimation of shear wave speed (SWS) induced by the radiation force of an ultrasound beam. Although the SW initially propagates in the direction perpendicular to the pushing beam, the SW direction changes because of its refraction occurring during traveling in an inhomogeneous medium. The refraction can cause the estimation errors of SWS when the speed is measured along the initial propagation direction. In this paper, we demonstrate that the conventional SWS reconstruction methods yield biased estimates in refractive region. To overcome the problems, also, we propose a novel method in which the differences of SW arrival time in orthogonal directions are used to calculate both the speed and the direction of SW. In the proposed method, SW velocity vectors are estimated and thus their speed can be measured along the propagation direction. Therefore, the estimation errors due to the refraction can be minimized. By the simulations and phantom experiments, we verified that the proposed method can provide more accurate and uniform SWS map than the conventional methods especially in the refractive region. |
Starting Page | 1113 |
Ending Page | 1116 |
File Size | 752631 |
Page Count | 4 |
File Format | |
e-ISBN | 9781479970490 |
DOI | 10.1109/ULTSYM.2014.0273 |
Language | English |
Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Publisher Date | 2014-09-03 |
Publisher Place | USA |
Access Restriction | Subscribed |
Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subject Keyword | Elasticity Ultrasonic imaging Phantoms Acoustics Estimation Image reconstruction shear wave speed map reconstruction shear wave elasticity imaging refraction artifacts |
Content Type | Text |
Resource Type | Article |
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