Pushing the boundaries of spatial resolution in dosimetry using polymer gels and radiochromic films

8th International Conference on 3D Radiation Dosimetry

Heilemann, G.^1 ; Georg, D.^1,2 ; Berg, A.^3

Department of Radiation Oncology and Comprehensive Cancer Center, Medical University of Vienna/AKH Vienna, Vienna, Austria^1

Christian Doppler Laboratory for Medical Radiation Research for Radiation Oncology, Medical University of Vienna, Austria^2

MR Centre of Excellence, Center for Biomedical Engineering and Physics, Medical University of Vienna, Vienna, Austria^3

关键词: Collimated beams;    Diamond detectors;    Dose distributions;    High spatial resolution;    Millimeter-scale;    Radiochromic film;    Spatial resolution;    Verification tools;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/573/1/012034/pdf
DOI  :  10.1088/1742-6596/573/1/012034

来源: IOP

【 摘 要 】

Advanced radiotherapy and brachytherapy techniques are raising the bar for detectors with respect to high spatial resolution. Dosimetry based on most point-like dosimeters, e.g. diamond detectors or small volume ionization chambers cannot be used efficiently and accurately for detecting 2 or 3D-dose variations at millimeter scale. Hence radiochromic films and polymer gels with high two/three-dimensional resolution provide a good verification tool for measuring dose distributions of very small collimated beams. In this study the performance of film and gel detectors in detecting the very fine dose distributions generated from collimation holes of four different sizes is investigated. Pencil beams with diameters down to 0.455 mm could be resolved by both detector types comparably.