|Title:||Temperature Control of Ultrasound Hyperthermia with Optimal Thermocouple Location and Target Temperature||Authors:||LIN, WIN-LI
|Keywords:||超音波高溫療法;最佳化;控制;高溫療法;ULTRASOUND HYPERTHERMIA;OPTIMIZATION;CONTROL;HYPERTHERMIA||Issue Date:||1993||Source:||醫學工程,v.5||Journal Issue:||n.4||Start page/Pages:||504-514||Abstract:||
Scanned, focused ultrasound systems (SFUS) have considerable flexibility in shaping the power deposition field during hyperthermia treatments(HTs). When Employing this adaptability, many complicated, interacting decisions must be made to obtain an optimal treatment temperature distribution (TD). This optimal treatment problem has been studied: (1) using an optimization scheme which is based onα 3-D radially symmetrical simulation program to search for a set of optimal scan parameters (SPs) to give a suitable power deposition (PD) pattern, and (2) using a control algorithm to obtain a suitable output power to overcome the blood perfusion variation. When applying control algorithm to determine the magnitude of output power, the locations and the target temperatures of control therocouples are very important. Since the blood perfusion( distribution and variation) is unknown and the number of the inserted thermocouples is limited. In order to solve these problems, a process based on optimization is used to obtain the control thermocouple locations and the respective target temperatures. Simulations and in vivo dog experiment results show: (1) the system can get to the steady-state very fast, (2) the steady-state temperature distribution is pretty good, and(3) the transient temperature response is always kept around the target temperature even though the blood perfusion of the treatment region is unknown.#A5293061
|Appears in Collections:||醫學工程學研究所|
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