Dosimetric Characteristics of a 3D-printed Bolus Fabricated using Different Filament Materials for Radiation Therapy

초록

This study aims to evaluate the dosimetric characteristics of a three-dimensional (3D) bolus fabricated using different filament materials to replace clinical bolus, a commercially available tissue equivalent in radiation therapy. The build-up region and the maximum dose depth (Dmax) in different filament materials, thicknesses, and various photon energies were calculated using the GATE Monte Carlo code. The 3D-printed boluses were placed on the water phantom at a source-to-surface distance of 100 cm, and the field size was set as 10 × 10 cm2. The dose distributions were evaluated for eight thermoplastic filaments with the thicknesses of 0.5, 1.0, 1.5, and 2.0 cm. Consequently, the filaments most similar to the maximum dose depth of the simulated linear accelerator exhibited the TPUs at 1.4, 2.4, and 3.2 cm for the photon energies of 6, 10, and 15 MV, PLAs at 1.5, 2.4, and 3.1 cm, and PETGs at 1.5, 2.4, and 3.0 cm, respectively. © 2022 The Korean Physical Society. All rights reserved.

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