Room: AAPM ePoster Library
Three-dimensional (3D) printing is widely used for imaging and dosimetry phantom in radiation therapy. The purpose of this study was to investigate the feasibility of a 3D-printed scintillation detector.
The 3D-printed scintillation detector was formed using photopolymer resins and constructed by stereolithography 3D printer (Phrozen shuffle XL; Phrozen Tech Co. Ltd.). We developed a new resin that emits light in response to radiation. The emission from the scintillator was detected by a Charge-Coupled Device (CCD) camera (BU-50LN; BITRAN). The energies of the electron beam were 6 MeV and 9 MeV from Varian TreuBeam linear accelerator, and the dose linearity of the emission quantity was verified. The depth dose curves obtained by the 3D-printed scintillation detector were compared with that obtained by the ionization chamber (Advanced Markus Electron Chamber; PTW-Freiburg) to verify the feasibility of a 3D-printed scintillation detector.
The 3D-printed scintillation detector showed good dose linearity and the determination coefficient (R2) value was 0.994 between 0 and 300 MU. In the PDD comparison, the 50% dose depth was 23.5 mm and 35.2 mm at 6 MeV and 9 MeV, respectively. The difference between the 50% dose depth obtained by the ionization chamber measurement was -0.2 mm and -0.8 mm. On the other hand, there was an increase in the surface dose, which is most likely caused by surface reflection.
In this study, we succeeded in three-dimensional modeling using scintillation materials. The feasibility of a 3D-printed scintillation detector has been confirmed in obtaining the dose distribution of electron beams, and future development is expected. There is an effect of reflection which may be caused by some coloring, and investigation on materials with high transparency is continuing.
Funding Support, Disclosures, and Conflict of Interest: JSPS KAKENHI Grant Number 19K17181