Abstract
Enhanced dynamic wedge factors (EDWF) are characterized by a strong field sizedependence. In contrast to physical wedge factors, the EDWF decrease as thefield size is increased: for 6 MV 60° wedge, the EDWF decreases by50% when the field size is increased from 4×4 cm2 to20×20 cm2. A method that eliminates the field size dependence ofEDWF was developed and investigated in this work. In this method, the wedgedfield shape is determined by a multileaf collimator. The initial position ofthe moving Y jaw is determined by the field size and the stationary Y jawis kept fixed at 10 cm for field sizes ⩽20 cm in thewedged direction. For all other fields, the stationary Y jaw setting isdetermined by the field size. The modified method results in EDWF that areindependent of field size, with no change in the wedge dose distribution whencompared with the conventional use of EDW.
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