Ono S, Hirose T, Shiba T, Kuriya K, Watanabe K
Department of Radiology, Miyazaki Medical College.
Nihon Igaku Hoshasen Gakkai Zasshi. 1996 Mar;56(4):195-200.
Ultrasound (US) hyperthermia is a local heating method that has recently been introduced into clinical practice. A prototype and modified version of this system using a phantom model (agar with bone inserted) were evaluated. The prototype system consists of a power delivery unit (0.5 MHz frequency) with a circulating cooled water bolus. This system heats a shallow area irrespective of power output, but has a tendency to overheat the phantom surface. We incorporated three modifications into the prototype. The modified type has three frequency applicators (0.5, 1.0, 1.5MHz) and a secondary bolus. Aluminum-urethane shields were used to cover the phantom surface located over bone preventing overheating of bone. By changing the applicator's US frequency, we could change the depth of the heating area. Overheating of the phantom surface and bone thus was avoided. These results suggest that our modified US hyperthermia system with multiple frequency applicators, a secondary bolus and aluminum-urethane shields provided a good heating pattern.
超声（US）热疗是一种最近被引入临床实践的局部加热方法。对使用体模模型（插入骨骼的琼脂）的该系统的原型和改进版本进行了评估。原型系统由一个带有循环冷却水团的功率输送单元（频率为0.5MHz）组成。该系统无论功率输出如何都会加热浅表层区域，但有使体模表面过热的倾向。我们对原型进行了三项改进。改进型有三个频率的换能器（0.5、1.0、1.5MHz）和一个辅助水团。使用铝 - 聚氨酯屏蔽来覆盖位于骨骼上方的体模表面，防止骨骼过热。通过改变换能器的超声频率，可以改变加热区域的深度。从而避免了体模表面和骨骼的过热。这些结果表明，我们改进的具有多个频率换能器、辅助水团和铝 - 聚氨酯屏蔽的超声热疗系统提供了良好的加热模式。
