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We investigated the parameter optimization of ridge filter thickness using aMonte Carlo simulation for carbon ion therapy. For this study, a ridge filterwas designed for the Spread-Out Bragg Peak (SOBP) by considering the relativebiological effect (RBE). The thickness, height, and width of the ridge filterwere designed by using the FLUKA and GEANT4 code, and we analyzed and comparedthe results of the physical dose distribution for the FLUKA and GEANT4 coding.The results show that the minimum width of the groove for the ridge filtershould be at least 0.4cm for the appropriate biological dose. The SOBP sectionsare 8cm, 9cm, and 10cm, respectively, when heights are 3.5cm, 4.0cm, and 4.5cm.The height of the ridge filter is designed to be associated with the SOBPwidth. Also, the results for the FLUKA and GEANT4 code show that an averagevalue of difference is 3% and a maximum error is 5%; however, its trend wassimilar. Therefore, the height and width of the groove for the ridge filter areused for important parameters to decide the length and plateau of SOBP.

A comparison study of ridge filter parameter using FLUKA and GEANT4 simulation code