Berlin 2024 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 9: Radiation Monitoring and Dosimetry

ST 9.3: Vortrag

Donnerstag, 21. März 2024, 15:30–15:45, PC 203

Dose gradients for calibration of planar dosimeters in modern radiotherapy — •Stevan Pecic¹, Strahinja Stojadinovic², Ivan Belca¹, Ljubomir Kurij³, Borko Nidzovic⁴, and Slobodan Devic⁵ — ¹Faculty of Physics, University of Belgrade, Belgrade, Serbia — ²Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas TX, USA — ³University Clinical Center, Belgrade, Serbia — ⁴Institute of Oncology and Radiology of Serbia, Belgrade, Serbia — ⁵Medical Physics Unit, McGill University, Montreal, Canada

This investigation explores the importance of dose gradients in achieving accurate calibration for modern planar dosimeters. The focus was on the advantages of using dose gradients while identifying novel methodologies for gradient-based calibration. Radiochromic films were subjected to both conventional and cutting-edge gradient-based calibration techniques, including an in-depth examination of physical wedge calibration. The study investigated the problem of achieving the desired calibration dose range by identifying optimal gradient placement and the required number of exposures. The insights gained from physical wedge calibration demonstrated promising outcomes in terms of reliability and useability. Optimization studies on wedge gradient positioning indicated the potential for achieving uniformity with just a few exposures. Additionally, valuable insights were obtained regarding the measurement resolution. In summary, the presented method proves the synergistic interplay of using gradients and optimization, holding promise for broader application in contemporary medical physics.

Keywords: Radiation dosimetry; Dose gradients; Radiochromic film; Calibration; Medical Physics