De Leeuw A A, Mooibroek J, Lagendijk J J
Department of Radiotherapy, University Hospital, Utrecht, The Netherlands.
Int J Hyperthermia. 1991 Jul-Aug;7(4):605-11. doi: 10.3109/02656739109034972.
Cylindrical and elliptical homogenous phantoms were used to investigate, both theoretically and experimentally, the effect of phantom positioning on the specific absorption rate (SAR) distribution of the 'Coaxial TEM' system. Theoretical predictions indicated that the maximum of the SAR distribution was stationary around the central axis of the applicator system, irrespective of the position of the phantom. Therefore the maximum SAR can be located at different phantom sites as required. Although two-dimensional models give a qualitative insight in the phenomena studied, they lack quantitive agreement. The steering capacity has been confirmed experimentally and is now clinically applied by positioning the tumour mass according to these insights.
使用圆柱形和椭圆形均匀体模从理论和实验两方面研究体模定位对“同轴横电磁波”系统比吸收率（SAR）分布的影响。理论预测表明，SAR分布的最大值在施源器系统的中心轴周围是固定的，与体模的位置无关。因此，最大SAR可以根据需要位于不同的体模部位。虽然二维模型能对所研究的现象提供定性的见解，但它们缺乏定量的一致性。这种调控能力已通过实验得到证实，现在临床上根据这些见解对肿瘤块进行定位来应用。
