Tolbert D D, Lane R G, Paliwal B R, Frost S W, Chin K B, Dercks J
Med Phys. 1977 Sep-Oct;4(5):419-22. doi: 10.1118/1.594322.
The characteristics of wedged fields which affect their clinical use have been examined for the 10-MV x-ray beam from the Clinac-18. The methods used for obtaining and analyzing the wedged-field data are discussed. These characteristics have been examined in terms of (a) the wedge angle, (b) the variation of the wedge angle with field size, (c) the variation in the angle through which isodose curves between the approximate depths of 5 and 15 cm are turned relative to the central axis as a function of depth, and (d) the variation of wedge central-axis transmission factor with field size. Analysis of the data pertinent to these categories is presented for the 15-, 30-, 45-, and 60-deg wedges. In addition, the effect of the 60-deg wedge upon the position of maximum dose on the central axis was determined.
已对Clinac - 18型加速器产生的10兆伏X射线束的楔形野影响其临床应用的特性进行了研究。讨论了获取和分析楔形野数据所使用的方法。已从以下几个方面对这些特性进行了研究：(a)楔形角；(b)楔形角随射野大小的变化；(c)在大约5厘米至15厘米深度之间等剂量曲线相对于中心轴转动的角度随深度的变化；(d)楔形中心轴透射因子随射野大小的变化。给出了针对15°、30°、45°和60°楔形野与这些类别相关的数据的分析。此外，还确定了60°楔形野对中心轴上最大剂量位置的影响。
