Prasad S C, Bassano D A
SUNY, Health Science Center, Division of Radiological Sciences, Syracuse 13210.
Med Phys. 1991 Jul-Aug;18(4):763-4. doi: 10.1118/1.596628.
Maximum x-ray field sizes on many linear accelerators are obtained only with truncated corners. Transmissions through the corners of such fields has been measured utilizing film and ion chamber dosimetry for a number of accelerators. Transmissions are found to be significantly larger than for the movable jaws.
许多直线加速器上的最大X射线射野尺寸只有在边角被截断的情况下才能获得。对于多台加速器，已经利用胶片和电离室剂量测定法测量了穿过此类射野边角的透射率。结果发现，其透射率比活动挡块的透射率要大得多。
