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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37413
標題: | 模擬超音波燒灼肝腫瘤過程 Numerical investigation of liver tumor ablation by high-intensity ultrasound |
作者: | Ruan Chen-wei 阮辰帷 |
指導教授: | 許文翰 |
關鍵字: | 肝腫瘤,高強度超音波,灌流,acoustic streaming,nonlinear Westervelt equation, liver tumor,acoustics-thermal-fluid,high-intensity ultrasound,perfusion,convective cooling,acoustic streaming,nonlinear Westervelt equation, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | This study is aimed to predict the temperature near a liver tumor using the proposed acoustics-thermal-fluid coupling model. For capable of modeling heat absorption by tissues, the nonlinear acoustic model for simulating the high-intensity ultrasound is chosen so that wave distortion due to finite-amplitude propagation can be taken into account. The nonlinear hemodynamic model is also incorporated into the prediction of thermal dose in the physical domain, which has been split into the tissue domain, where homogenization dominates in perfusion domain and advection heat transfer is essential in the blood domain. Acoustic streaming, which may not be a negligible force in the determination of blood flow acceleration, will be also included in the present therapeutic system. In HIFU (High Intensity Focused Ultrasound), ultrasound is normally associated with the high frequency sound, which makes the calculation of acoustic pressure from the employed nonlinear Westervelt equation very expensive. This motivated us to develop a computationally very efficient alternating direction implicit scheme to solve the three dimensional wave equation by the proposed sixth-order accurate compact scheme for solving the inhomogeneous Helmholtz equation. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37413 |
全文授權: | 有償授權 |
顯示於系所單位: | 工程科學及海洋工程學系 |
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