Gibbons J P, Khan F M
Department of Radiation Oncology, Richland Memorial Hospital, Columbia, South Carolina 29203, USA.
Med Phys. 1995 Sep;22(9):1451-7. doi: 10.1118/1.597569.
A method is introduced to calculate monitor units to points off axis. Extensive data are presented comparing this method with measured values of dose per monitor unit on the central ray of asymmetric fields produced by a variety of linear accelerators. The technique demonstrates improvement over existing methods that use large-field profile data. The method is found to be both simple and accurate: Agreement within +/- 2% is obtained using parameters readily available within the clinic.
介绍了一种计算离轴点监测单位的方法。给出了大量数据，将该方法与多种直线加速器产生的非对称野中心射线上每个监测单位剂量的测量值进行了比较。该技术相较于使用大野轮廓数据的现有方法有改进。发现该方法既简单又准确：使用临床中容易获得的参数，可实现±2%以内的一致性。
