Kumar P P, Henschke K, Mandal K P, Nibhanupudy J R, Patel I S
J Natl Med Assoc. 1977 Apr 1;69(4):223-6.
This paper describes the problems and solutions in using 18 MeV linear accelerator, with minimum 6 MeV electron capability, for total skin irradiation for mycosis fungoides. The 6 MeV electron energy can be degraded to acceptable electron energy of 3.2 MeV by interposing a plexiglass sheet of 9.6 mm in the beam. To minimize the bremsstrahlung, the degrading plexiglass should be kept away from the machine head. A wide area with uniform dose distribution over single plane can be achieved by using dual fields but homogenous dose distribution over irregular body surface cannot be achieved mainly because of self-shielding. The nails and the ocular lens can be easily shielded from the low energy electrons with 1.5 mm lead shield.
本文描述了使用具有至少6 MeV电子能量的18 MeV直线加速器进行蕈样肉芽肿全身皮肤照射时的问题及解决方案。通过在射束中插入一块9.6 mm的有机玻璃板，6 MeV的电子能量可降至可接受的3.2 MeV电子能量。为使轫致辐射最小化，降解用的有机玻璃板应远离机头。使用双野可在单平面上实现剂量分布均匀的大面积照射，但主要由于自身屏蔽，无法在不规则体表上实现均匀的剂量分布。用1.5 mm的铅屏蔽可轻松将指甲和晶状体与低能电子屏蔽开。
