Erlangen 2026 – scientific programme
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ST: Fachverband Strahlen- und Medizinphysik
ST 7: Radiation Therapy
ST 7.1: Talk
Thursday, March 19, 2026, 16:15–16:30, KH 01.013
Investigation of the surface dose distribution of Ru-106 eye plaques using an innovative setup — •Johannes Wintz1, Johannes Albrecht2, and Dirk Flühs1 — 1Department of Radiotherapy, University Medicine Essen, Essen — 2TU Dortmund University, Dortmund
Brachytherapy with ruthenium-106 applicators is an established method for treating eye tumours.
Due to the manufacturing process, the surface dose distribution is not homogeneous and exhibits so-called hot and cold spots where the dose is higher or lower than at the centre of the eye plaque. According to the manufacturer’s production specifications, relative dose deviations of up to ± 11% are permitted. For quality assurance, the dose profile is measured at 33 positions to ensure that this standard is met.
Within the project, measurements of the surface dose distribution are carried out using a bespoke measurement apparatus to determine the dose profile with higher resolution and analyse its influence on therapy. A new method using a plastic scintillator is employed, surrounded by air, which reduces the potential for Cherenkov radiation and thus provides more precise information about the activity on the eye plaque.
The structure of the new measurement system will be presented, along with initial results, which will be compared with the simulations and the manufacturer’s specifications.
Keywords: Brachytherapy; Dose inhomogeneities; Ocular tumours; Measurement