High Intensity Focused Ultrasound Treatment and Image-based Tracking with Periodic Tumor Motion
Date Issued
2005
Date
2005
Author(s)
Huang, Jeng-Sheng
DOI
zh-TW
Abstract
Image guidance in hyperthermia offers the potential for precise thermal dose delivery to a moving tumor. MR-Image guided ultrasound thermal therapy has been investigated in many studies recently. MR-Image offers not only the temperature field in the tissue but also the other information, for instance, perfusion…etc.
Phased array transducer has the ability to change the focus position and patterns by tuning the phase and power per element on array transducer. The main system is to combine CCD image system used to simulate image acquired by medical image(MRI, Ultrasound Image, diagnostic x-ray imaging ) with HIFU(High Intensity Focus Ultrasound). Putting tissue on the movable plane controlled by servo-motor simulates the organ motion by respiration. To integrate motion system, image sensor and sonic-system is the main operation for solving "locked on target" through image detection.
However, the delivery of a treatment plan through sonic beam tracking requires adequate consideration of treatment system latencies, including image acquisition, image processing, communication delays, control system processing, inductance within the motor, mechanical damping, etc. Regular respiratory motion fitted by Fourier series is ordered to overcome system delay.
Subjects
馬達
影像追蹤
相位陣列換能器
超音波熱治療
腫瘤運動
Servo-motor
Image guidance
Phased-array transducer
HIFU
Respiratory tumor motion tracking
Type
thesis