Physical basis of RF hyperthermia for cancer therapy (1). Measurement for distribution in absorbed power from radiofrequency exposure in agar phantom.
Physical basis of RF hyperthermia for cancer therapy (1). Measurement for distribution in absorbed power from radiofrequency exposure in agar phantom.
复制标题
射频热疗癌症治疗的物理基础 (1)。
DOI：
10.1269/jrr.21.180
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发表时间：
1980
影响因子：
2
通讯作者：
E. Kano
中科院分区：
文献类型：
--
作者：
T. Ishida;H. Kato;J. Miyakoshi;M. Furukawa;S. Ohsaki;E. Kano
通过在 13.56 MHz 射频辐射后立即扫描热电偶来测量模型中吸收的射频功率的分布；使用的模型由2.0W/W％琼脂、0.5W/W％NaCl和97.5W/W％蒸馏水组成，并且在电导率和介电常数方面与高含水量组织相当。体模中心轴中点吸收的射频功率随着其厚度的增加呈指数下降。当射频电极变小时，中点的下降更为显着。中点至 1 cm 深度处的相对吸收射频功率以及体模的相对厚度与电极直径之间的关系显示为一种指数函数，与电极直径无关。当体模厚度小于电极直径时，中点有效加热直径等于电极直径；当体模厚度大于电极直径时，中点有效加热直径大于电极直径。
Distribution of the absorbed RF power in a phantom was measured by scanning the thermocouple immediately after RF-irradiation of 13.56 MHz; a phantom used was composed of 2.0 W/W % agar, 0.5 W/W % NaCI and 97.5 W/W % distilled water and equivalent to high water content tissue both in the electric conductivity and the dielectric constant. Absorbed RF power at the midpoint on the central axis of the phantom decreased exponentially in accordance with increasing in its thickness. And the decrease at the midpoint was more remarkable at the RF electrodes got smaller. Relationship between relative absorbed RF power at the midpoint to that at 1 cm in the depth and relative thickness of the phantom to the diameter of electrodes was shown as a sort of exponential function regardless the diameter of electrodes. The effective heating diameter at the midpoint was equal to the diameter of electrode if the thickness of phantom was smaller than the diameter of electrode, while the effective heating diameter became larger than the diameter of electrode as the thickness of phantom became larger than the diameter of electrode.