Anhalt D, Hynynen K
Department of Radiation Oncology, University of Arizona Health Sciences Center, Tucson 85724.
Med Phys. 1988 Nov-Dec;15(6):919-21. doi: 10.1118/1.596176.
When inducing localized hyperthermia for superficial cancer therapy with microwaves there has often been question about the total power output from the applicator. Although specific absorption rates and thermograms are used to obtain localized power distributions and heating patterns, these provide, at best, only an approximation of the total power applied to tissues or phantoms. In this paper a calorimetric technique for obtaining total microwave output power from applicators is described. An experimental apparatus was constructed and it was found to be accurate to approximately +/- 5 W. The power output from four clinical microwave applicators as a function of applied electric power was measured and the efficiency was found to be 40% in average. Along with enhancing quality assurance, the areas of hyperthermia research which may benefit the most from this calorimetric technique are computer modeling and patient treatment planning.
在用微波诱导局部热疗治疗浅表癌症时，关于施加器的总功率输出一直存在疑问。尽管使用比吸收率和热成像图来获取局部功率分布和加热模式，但这些充其量只能提供施加到组织或体模上的总功率的近似值。本文描述了一种用于从施加器获取微波总输出功率的量热技术。构建了一个实验装置，发现其精度约为±5瓦。测量了四个临床微波施加器的功率输出与施加电功率的函数关系，发现平均效率为40%。除了加强质量保证外，热疗研究中可能从这种量热技术中受益最大的领域是计算机建模和患者治疗计划。
