| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 87 === Conventional thermal therapy strategies, constrained by the transducer design, usually keep the heating temperature at 43 to 45oC and have a long heating duration. However, because of the thermolysis and circulation of human bodies, this kind of thermal therapy strategy needs more energy and could not heating tumor precisely without affecting normal tissues around it.
This study, based on the bio-heat transfer equation, is to investigate the practicability of high temperature thermal therapy. The transient analysis is used in stead of traditional steady state one. The intensity, temperature and thermal dose distribution study of nonfocused cylindrical ultrasound applicator applied to intracavitary hyperthermia suggests many propositions on prostate, rectum, and vaginal tumor treatment.
Moreover, for the further investigation of high temperature thermal therapy, a selected small tissue cube is heated by different heating schemes to obtain some concepts about heating process and system design. Besides, large blood vessels transited the heating region are also an important factor to hyperthermia failure. Hence we simulate this by a simple vessel model across the heating tissue cube to assess the practicability of empirical treatment.
Some elementary investigation of ultrasound wave field simulated by damped wave equation is also presented.
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