Equivalence between Solid Water and printed PLA plates for 6 MV clinical photon beam - An assessment using thermoluminescent dosimetry

Abstract

Three dimensional models of anatomical structures, produced by rapid prototyping are being adopted for medical application as hemodynamics studies and maxillofacial surgery planning. Models with geometrical accuracy can be achieved using medical images as MRI or CT and produced using polyurethane, polylactic acid and epoxy resins[1]. When a volume of tissue equivalent material is used to simulate an interaction of radiation, this volume is given by the name phantom [2]. Plates with different thickness were printed using a 3D printer using a filament of PLA. As the standard material it was used plates of Solid Water RMI-457. The plates of PLA and Solid Water were irradiated using a Linear Accelarator of 6 MV. For each material were performed irradiations for the same thickness of material, in each of them were used thermoluminescent dosimeters of LiF:Mg,Ti to measure the absorbed dose. This work aims to compare the thermoluminescent (TL) dosimetric behavior of PLA plates printed using a 3D printer and solid water plates in the absorbed dose evaluation using clinical photon beams.