Coffey C W, Morris R, Martin J, Maruyama Y
Department of Radiation Medicine, University of Kentucky Medical Center, Lexington 40536.
Int J Radiat Oncol Biol Phys. 1989 Mar;16(3):849-55. doi: 10.1016/0360-3016(89)90505-1.
This investigation presents the beam characteristics of a newly-marketed variable energy superficial X ray machine for radiotherapy. The X ray system hardware, including a high voltage generator, and console software allow for nine independent operator-selected X ray beams from 10-150 kVp. Filament current values are also independently variable; 1.0-13.0 mA for 90-150 kVp, and 1.0-30.0 mA for 10-90 kVp. The HVL's, effective energies, and radiation outputs for the nine combinations of kVp and mA are presented. In addition, percentage depth dose and beam uniformity results are presented as a function of cone size. Radiation output stability and reproducibility results are included. Discussion of adaptation of this X ray system to the Papillon technique for the treatment of rectal cancers is presented.
本研究展示了一种新上市的用于放射治疗的可变能量浅表X射线机的射束特性。X射线系统硬件（包括高压发生器）及控制台软件允许操作员从10 - 150 kVp中选择九种独立的X射线束。灯丝电流值也可独立变化；90 - 150 kVp时为1.0 - 13.0 mA，10 - 90 kVp时为1.0 - 30.0 mA。给出了kVp和mA九种组合的半值层、有效能量及辐射输出。此外，给出了百分深度剂量和射束均匀性结果与锥形尺寸的函数关系。还包括辐射输出稳定性和再现性结果。文中讨论了这种X射线系统在帕皮永技术治疗直肠癌方面的适用性。
