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Feasibility of a Tungsten Rubber Grid Collimator for Electron Grid Therapy
Kenta Kijima1, Anchali Krisanachinda2, Mikoto Tamura1
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osaka, Japan.
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.
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