ACTA

G4RT - Geant4-Based Simulation Platform for Radiotherapy Phantom Studies

J. Hajduga^a, R. Naina^b, B. Rachwa l^a, T. Szumlak^a, T. Fiutowski^a, D. Kabat^c, K. Kalecińska^a, S. Koperny^a, M. Kopeć^a, D. Kulig^a, B. Lach^a, B. Mindur^a, J. Moroń^a, P. Wiącek^a
^aFaculty of Physics and Applied Computer Science (WFiIS), AGH University of Krakow, al. Mickiewicza 30, 30-059 Kraków, Poland
^bFaculty of Physics, Vilnius University, Saulėtekio av. 9, LT-10222 Vilnius, Lithuania
^cMaria Sklodowska-Curie National Research Institute of Oncology, Krakow Branch, Garncarska 11, 31-115 Kraków, Poland

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We introduce G4RT, a reproducible simulation framework that transforms complete computer-aided design assemblies into Geant4-compatible detector geometries via a fully auditable computer-aided design-to-database (CAD → DB) workflow. Exports from the Fusion 360 CAD platform (3MF and CSV) are normalized into a schema-constrained database and processed by a database-driven geometry builder, which preserves hierarchical structure, material definitions, and spatial transformations while generating tessellated solids and registering sensitive detector volumes. Physics settings, cut-offs, sources (analytic or International Atomic Energy Agency phase-space files), and scoring parameters are centrally configured using TOML, a human-readable configuration file format. We assess geometry fidelity, dosimetric accuracy via gamma analysis, and computational performance under multithreading, demonstrating reduced iteration times and enhanced auditability compared to hand-coded geometries. This approach is particularly suited for experiments employing 3D-printed scintillator phantoms under clinically realistic beam conditions.

DOI:10.12693/APhysPolA.148.S85
topics: Geant4, radiotherapy, 3D-printed scintillator phantoms, database-driven geometry