Abrath F G, Purdy J A
Radiology. 1980 Sep;136(3):757-62. doi: 10.1148/radiology.136.3.6773106.
The design and construction details of wedge filters for 25-MV x-ray beams are presented. The authors studied how the characteristics of wedged fields affect their clinical use with 25 MV x rays, paying particular attention to the effects of (a) the wedge angle, (b) the variation of the wedge angle with field size, (c) the variation with depth of the isodose angles relative to th central axis, and (d) the wedge factor. The analysis of the data pertinent to the above parameters is presented for 30 degrees, 45 degrees, and 60 degrees wedges. In addition, the authors experimentally confirmed the accuracy of Tatcher's method (7), by which a wide range of wedge angles smaller than the nominal angle can be generated by using a combination of open and wedge beams.
介绍了用于25兆伏X射线束的楔形滤过器的设计和构造细节。作者研究了楔形射野的特性如何影响其在25兆伏X射线下的临床应用，特别关注以下因素的影响：(a)楔形角；(b)楔形角随射野大小的变化；(c)相对于中心轴的等剂量角随深度的变化；以及(d)楔形因子。给出了针对30度、45度和60度楔形的与上述参数相关的数据的分析。此外，作者通过实验证实了塔彻方法(7)的准确性，通过使用开放射野和楔形射野的组合可以产生比标称角小得多的一系列楔形角。
