Dose volume histogram analysis for comparison of usability of linear accelerator flattening filter

The wedge filter has two movements, fixed and dynamic. In this study, the depth dose distribution was analyzed to determine the stability of the dose distribution and dose volume histograms obtained by evaluating the usability of the critical normal tissue dose around the tumor dose. The depth dose was analyzed from the dose distribution from a Linac (6 MV and 10 MV irradiation feld of energy 20×20 cm², wedge filter with a SSD of 100 cm and 15°, 30°, 45° Y1-in (Left -7 cm), Y2-out (Right +7 cm). To analyze the fluctuations of the depth dose, a fxed wedge and dynamic wedge toe portion was examined according to the energy and angle because the size of the fluctuations was included in the error bound and did not show significant differences. The neck, breast, and pelvic dosimetry in tumor tissue are measured more commonly with a dynamic wedge than a fxed wedge presumably due to the error range. On the other hand, dosimetry of the surrounding normal tissue is more common using a fxed wedge than with a dynamic wedge