Methods First,we measured the dose rate for several fields and depths with and without 60 degree wedge on Siemens MD7745 and GE Saturne41 medical linear accelerators,and got the wedge factors for these fields and depths.

• 方法对SIEMENS MD7745直线加速器和GE Saturne41直线加速器,6MV-X线,60°楔形滤片,测量不同大小的照射野且不同深度处加和不加楔形滤片时的剂量率,计算楔形因子。