McCullough E C, Anderson J A
Med Phys. 1982 Mar-Apr;9(2):261-8. doi: 10.1118/1.595162.
A prototype electron applicator system providing circular and rectangular fields for use in intraoperative electron beam therapy with a Varian Clinac 18 linear accelerator has been fabricated. The dosimetric properties of this system for a variety of electron-beam energies, applicator sizes, and x-ray collimator settings was documented. Significant findings include: (a) surface dose values are in excess of 90% for electron energies of 12 MeV and above; (b) for the 18-MeV beam, the deepest depth where the central axis dose in 90% of its maximum value is in excess of 50 mm for circular applicators whose diameters are in excess of 5 cm; and (c) the treatment time to deliver 1000 rads "given dose" (at given dose rate of 300 MU/min) is on the order of 3-4 min. Cross-field behavior is acceptable for the intended application and x-ray contamination is less than 4% for any applicator/electron energy combination. A system for irregular field blocking and TLD verification dosimetry has been developed.
已制造出一种原型电子施源器系统，该系统可为瓦里安Clinac 18直线加速器术中电子束治疗提供圆形和矩形射野。记录了该系统在各种电子束能量、施源器尺寸和X射线准直器设置下的剂量学特性。重要发现包括：(a) 对于12 MeV及以上的电子能量，表面剂量值超过90%；(b) 对于18 MeV的射束，对于直径超过5 cm的圆形施源器，中心轴剂量达到其最大值的90%时的最深深度超过50 mm；(c) 以300 MU/min的给定剂量率输送1000拉德“给定剂量”的治疗时间约为3 - 4分钟。对于预期应用，交叉射野特性是可接受的，并且对于任何施源器/电子能量组合，X射线污染小于4%。已开发出一种用于不规则射野遮挡和热释光剂量计验证剂量学的系统。
