Fricke and polymer gel 2D dosimetry validation using Monte Carlo simulation

JOSÉ VEDELAGO; DAVID CHACÓN; MALANO F.; CONEJEROS R.; FIGUEROA F.; GARCIA D; GONZALEZ G.; MARCELO ROMERO; SANTIBAÑEZ M; MIRIAM STRUMIA; VELASQUEZ J.; FACUNDO MATTEA; MAURO VALENTE

RADIATION MEASUREMENTS

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2016 p. 54 - 64

1350-4487

Complexity in modern radiotherapy treatments demands advanced dosimetry systems for quality control.These systems must have several characteristics, such as high spatial resolution, tissue equivalence,three-dimensional resolution, and dose-integrating capabilities. In this scenario, gel dosimetry hasproved to be a very promising option for quality assurance. In this study, the feasibility of Fricke andpolymer gel dosimeters suitably shaped in form of thin layers and optically analyzed by visible lighttransmission imaging has been investigated for quality assurance in external radiotherapy. Dosimeterirradiation was carried out with a 6-MV photon beam (CLINAC 600C). The analysis of the irradiateddosimeters was done using two-dimensional optical transmission images. These dosimeters werecompared with a treatment plan system using Monte Carlo simulations as a reference by means of agamma test with parameters of 1 mm and 2%. Results show very good agreement between the differentdosimetric systems: in the worst-case scenario, 98% of the analyzed points meet the test quality requirements.Therefore, gel dosimetry may be considered as a potential tool for the validation of otherdosimetric systems.