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ST: Fachverband Strahlen- und Medizinphysik

ST 2: Radiation Therapy I

ST 2.2: Vortrag

Dienstag, 19. März 2024, 10:15–10:30, PC 203

Simulation of inhomogeneous surface dose rate distributions of Ru-106 eye plaques — •Johannes Wintz¹, Michelle Stroth¹, Johannes Albrecht¹, and Dirk Flühs² — ¹TU Dortmund University, Dortmund, Germany — ²Department of Radio- therapy, Essen University Hospital, Essen

Brachytherapy with Ruthenium-106 plaques is a successful method for treating ocular tumours.

However, the surface dose distribution of the Ru-106 eye plaques is not homogeneous. There are so-called hot and cold spots where the dose can deviate from the dose at the centre of the plaque. To achieve the goal of complying with the tumour control rate, it is essential to consider these inhomogeneities in treatment planning.

The surface dose distribution is characterized by the manufacturer for each eye plaque using 33 defined measuring points. To simulate these dose profiles accurately, the measured dose values must be extrapolated and expanded, forming a mapping of the entire applicator surface. This approach allows the visualization of the surface as a two-dimensional array. The inhomogeneities of the dose profile are then simulated using Geant4-based Monte Carlo simulations. The processes, from the mapping of the dose distributions to the results of the simulation, are presented.

Keywords: Brachytherapy; Treatment planning; Dose inhomogeneities; Ocular tumours