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由日本三菱 ML - 2 0 0 MDX型号直线加速器 ( 10 MV )与国产 BJX- 型三维立体定向治疗系统匹配组成 X刀装置 ,介绍其辐射场剂量学有关参数的测量 ,其中包括利用小体积 ( 0 .0 15cc)的针尖电离室对不同射野直径 ( Φ5～ 4 5m m )的组织最大比 ( TMR )、总散射输出因子 ( St)的测量 ;使用胶片法测量离轴比 ( O AR) ;采用Φ160 m m有机玻璃球形模体和组织等效头形模体测量辐射场的剂量分布 ,并用此法验证了治疗计划与实施治疗的一致性
The X-knife device was matched with a domestic BJX-type three-dimensional stereotactic therapeutic system by the Japan Mitsubishi ML-200 MDX linear accelerator (10 MV) to measure the dosimetry parameters of the radiation field, including the measurement of small dose (0 .0 15cc) from the tip ionization chamber to the TMR and St of different field diameters (Φ5 ~ 45m); the off-axis ratio (O AR) was measured by the film method; The dose distribution of the radiation field was measured by Φ160 mm plexiglass spherical phantom and tissue equivalent head phantom, and this method was used to verify the consistency of the treatment plan and the implementation of the treatment