High Intensity Focused Ultrasound Thermal Therapy for Liver Tumors with Motion Prediction and Tracking Control

• Main Authors: Jian-Wen Liu, 劉建玟
• Other Authors: 陳永耀
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/72222435025387916603

碩士 === 國立臺灣大學 === 電機工程學研究所 === 94 === High intensity focus ultrasound is a non-invasive method to treat the tumor. A phased array transducer has the ability to change focus position or produce multi-focus by adjusting the amplitude and phase of each element on the surface of transducer. The characteristic of phased array can be utilized to kill the tumor that has reciprocation due to breathing within human body. Image guidance in hyperthermia offers the potential for deliver thermal dosage to a moving tumor precisely. Because MRI image provides not only the temperature varying but also other information, combining MRI with HIFU for treating tumor is the main purpose. In this study, CCD image is used to imitate MRI image. A platform is controlled by servo-motor to simulate the organ motion due to breathing. However, tracking a target via image processing takes a small period of time including of image acquisition, image processing and delay of communications. To overcome the whole system time delay, it is necessary to develop a predictive algorithm. Neural network is used to predict the future trend of tumor to overcome the system time delay. And interpolation is used to reconstruct trajectory between sampling points to let the heating can be continuous.