Zwicker R D, Shahabi S, Wu A, Sternick E S
Med Phys. 1985 May-Jun;12(3):347-9. doi: 10.1118/1.595694.
Measurements were undertaken with 30 degrees and 45 degrees large wedges on a 6-MV linac to determine the effective wedge angle for various combinations of open and wedged fields. The validity of Tatcher's equation, relating effective wedge angle to maximum dose weightings, was examined over a range of field sizes from 5 X 5 to 20 X 20 cm. An alternative equation involving only central axis quantities was also investigated. The results obtained from an analysis of point dose measurements indicate that, for these wedges, either equation yields sufficient accuracy for clinical purposes.
在一台6兆伏直线加速器上，使用30度和45度的大楔形板进行测量，以确定不同开放野和楔形野组合的有效楔形角。在5×5至20×20厘米的一系列射野尺寸范围内，检验了将有效楔形角与最大剂量权重相关联的塔彻尔方程的有效性。还研究了一个仅涉及中心轴量的替代方程。从点剂量测量分析中获得的结果表明，对于这些楔形板，这两个方程中的任何一个在临床应用中都能产生足够的精度。
