Biggs P J, Shipley W U
Int J Radiat Oncol Biol Phys. 1986 Jan;12(1):131-5. doi: 10.1016/0360-3016(86)90427-x.
We have made a device that improves the dose distributions of X ray fields from a 25 MV accelerator by increasing the width of the 95% dose relative to the 50%. This device, called a beam width improving device, is a specially designed "compensator," consisting of two lead sheets taped onto a plastic blocking tray and is tailored for each field so that it can accommodate square fields, rectangular fields and fields with corner cuts. Comparison of profiles with and without this compensator indicates an increase in the width of the 95% dose of approximately 8 mm for small fields to approximately 14 mm for large fields.
我们制造了一种装置，通过增加95%剂量相对于50%剂量的宽度，改善了来自25兆伏加速器的X射线束的剂量分布。这种装置称为束宽改善装置，是一种经过特殊设计的“补偿器”，由两张铅片粘贴在塑料挡块托盘上组成，并且针对每个射野进行定制，以便能够适应方形射野、矩形射野和带有切角的射野。有和没有这种补偿器的剂量分布图比较表明，对于小射野，95%剂量的宽度增加约8毫米，对于大射野增加约14毫米。
