International Society for Industrial Process Tomography

Analysis of Displacement Imaging Associated with Acoustic Radiation Force Impulse

Xuyang Bao, Shengnan Zhang, Yanbin Xu^*, Feng Dong

Tianjin Key Laboratory of Process Measurement and Control

School of Electrical and Information Engineering, Tianjin University, Tianjin, P.R. China

^*Email: xuyanbin@tju.edu.cn

ABSTRACT

Radiation force is a phenomenon in wave motion where part of the energy of the traveling wave is converted into momentum after experiencing absorption, scattering, or reflection. Monitoring the tissue response within the radiation force region of excitation and generating images of tissue’s displacements, acoustic radiation force impulse elasticity imaging is a popular imaging method which has been developed in recent years. This paper discussed the displacement attenuation in lateral directions. Exploring the feasibility of making full use of this kind of displacements, a direct displacement imaging was proposed. The simulation model was built for the proposed direct displacement Imaging. Simulation results demonstrated the direct displacement imaging generated from acoustic radiation force impulse was able to identify the accurate size and locate the exact position of the lesion effectively. The analysis of displacement investigated the effects of tissue Young’s modulus and lateral position on media displacements generated at a single forcing location. These results indicate that the direct displacement imaging have the potential to provide a fast detection of the ROI with high contrast in a relatively large region of imaging in lateral directions.

Keywords Acoustic radiation force impulse, Elastography, Medical imaging

Industrial Application Biomedical engineering