摘要
We study the influence of tissue inhomogeneity on the focused ultrasound based on the phase screen model and the acoustic nonlinear equation. The inhomogeneous tissue is considered as a combination of a homogeneous medium and a phase aberration screen. Six polyethylene （PE） plates with various correlation lengths and standard deviations are made to mimic the inhomogeneity induced by the human body abdominal. Results indicate that the correlation length affects the side lobe structure of the beam pattern; while the standard deviation is associated with the focusing capability. This study provides a theoretical and experimental basis for the development of a precise treatment plan for high intensity focused ultrasound.
We study the influence of tissue inhomogeneity on the focused ultrasound based on the phase screen model and the acoustic nonlinear equation. The inhomogeneous tissue is considered as a combination of a homogeneous medium and a phase aberration screen. Six polyethylene （PE） plates with various correlation lengths and standard deviations are made to mimic the inhomogeneity induced by the human body abdominal. Results indicate that the correlation length affects the side lobe structure of the beam pattern; while the standard deviation is associated with the focusing capability. This study provides a theoretical and experimental basis for the development of a precise treatment plan for high intensity focused ultrasound.
基金
Supported by the National Basic Research Program of China under Grant Nos 2010CB732600 and 2011CB707900, and the National Natural Science Foundation of China under Grant Nos 10974093 and 10974098.
