TY - JOUR T1 - Feasibility of a Tungsten Rubber Grid Collimator for Electron Grid Therapy JF - Anticancer Research JO - Anticancer Res SP - 2799 LP - 2804 DO - 10.21873/anticanres.13407 VL - 39 IS - 6 AU - KENTA KIJIMA AU - ANCHALI KRISANACHINDA AU - MIKOTO TAMURA AU - YASUMASA NISHIMURA AU - HAJIME MONZEN Y1 - 2019/06/01 UR - http://ar.iiarjournals.org/content/39/6/2799.abstract N2 - Background/Aim: Spatially fractionated radiotherapy (grid therapy) can control some bulky tumors which is challenging for conventional radiotherapy. This study aimed to investigate whether a novel tungsten contained rubber (TCR) grid collimator can be employed in electron grid therapy. Materials and Methods: The TCR grid collimator placed on a solid water phantom, and percentage depth doses (PDDs) and lateral dose profiles were measured for 9 MeV electron beam with Gafchromic EBT3 films. At the lateral dose profile, the ratios of the dose in the areas with and without shielding (valley-to-peak ratios) were evaluated. Results: The dmax values with the 1, 2 and 3 mm TCR grid collimators were 1.2, 1.1 and 0.7 cm, respectively, while the valley-to-peak ratios at each dmax were 0.566, 0.412 and 0.293, respectively. Conclusion: Only the 2 mm TCR grid collimator had adequate dosimetric features compared to the conventional grid collimator and could be substituted. ER -