Davis M G, Nyerick C E, Horton J L, Hogstrom K R
Department of Radiation Physics, The University of Texas M. D. Anderson Cancer Center, Houston 77030, USA.
Med Phys. 1996 Apr;23(4):521-2. doi: 10.1118/1.597683.
The effects of the mechanical loss of a stainless steel primary scattering foil on a 12-MeV electron beam from a dedicated intraoperative electron accelerator are discussed. Routine quality assurance tests, including dose output constancy, energy constancy, and beam uniformity (flatness and symmetry), were used to determine the nature of the malfunction when it occurred. It is concluded that these quality assurance checks, if done with the frequencies recommended by the AAPM Task Group 40 Report [Med. Phys. 21, 581-619 (1994)] and repeated at the time of occurrence, are sufficient to detect loss of an electron scattering foil.
讨论了专用术中电子加速器产生的12 MeV电子束中不锈钢初级散射箔片机械损耗的影响。当故障发生时，使用包括剂量输出稳定性、能量稳定性和射束均匀性（平坦度和对称性）在内的常规质量保证测试来确定故障的性质。得出的结论是，如果按照美国医学物理学家协会任务组40报告[《医学物理》21, 581 - 619 (1994)]推荐的频率进行这些质量保证检查，并在故障发生时重复进行，就足以检测到电子散射箔片的损耗。
