射频加温装置入射功率和循环水温对升温的影响

Influence of incident power and circulating water temperature on temperature elevation in radiofrequency heating device

目的 了解RF 8深部加温治疗冷却循环水温度及入射功率的变化对加温局部温度的影响 ,掌握加温的有效范围 ,寻找临床治疗合适的冷却循环水温度。方法 选择两个相同直径 (30cm)的电极对固体等效肌肉琼脂体模进行加温。在设定循环水 10℃时 ,测试不同入射功率两电极中心垂直轴之间各点的温度 ;以及不同循环水温度时体模水平中心平面及其上下各 5cm处平面内的温度分布。结果 在体模上下表面中心的连线上 ,入射功率和升温速率呈现明显的线性关系 (r =0 .999,P=0 .0 2 0 ) ;体模与电极接触的两侧表面到大约 5cm深处温度变化差别较大 ,循环水为 6℃时电极接触体模表层的温度低于体模基础温度 ,10℃与 16℃时体模表浅部温度逐渐升高。结论 容式射频深部加温治疗机RF 8在深部加温治疗时 ,入射功率与升温速率呈正比关系 ;在两个直径 30cm电极加温时 ,进入体模表面约 5cm以内温度分布比较均匀 ;冷却循环水温度影响体模表浅部的温度。

Objective To observe the influence of variation of incident power and cooling circulation water temperature (CCWT) on the temperature elevation of heated object in radiofrequency-8 (RF-8) deep-seated heating device, identify the heating effective area and find appropriate CCWT that adapts to clinical hyperthermia. Methods A pair of probes with diameter of 30?cm were selected to heat a solid muscular isoeffective agar pattern. While CCWT was set at 10?℃, the temperature of each point between the central axes of the two probes was tested, one by one, as the incident power differed. Temperature distribution on the central plane and those 5?cm above and below were also tested. Results There was a distinct linear correlation between the incident power and temperature elevation rate (r=0.999,P=0.020). The temperature variation was obviously greater from the pattern-probe connecting area to a depth of 5?cm. When CCWT was 6?℃, the temperature of the pattern-probe connecting area was lower than the basic pattern temperature. When the temperature of circulation water was 10?℃ and 16?℃, the temperature of the superficial part of the pattern increased gradually. Conclusions When RF-8 deep-seated heating device is in work, there is a distinct linear correlation between the incident power and temperature elevation rate. When a pair of probes with diameter of 30?cm are used during heating, temperature distribution is even from the surface of the pattern to a depth of 5?cm. CCWT has an effect on the temperature of superficial part of the pattern.