GafChromic films: impact of calibration accuracy for radiation therapy dosimetric purpose.
Scaggion A., Fusella M., Rama D., Riccardi L., Roggio A., Zorz A., De Monte F., Paiusco M.
The different applications of GafChromic films in high-energy radiation therapy (patient specific Quality Assurance and Linac Quality Control) might need different levels of accuracy. In this study different approaches for EBT3 GafChromic films are compared to establish a proper correspondence between NetOptical Density and delivered doses. Three different irradiation schemes with single and multichannel calibration are considered. A detailed mathematical description the overall accuracy is proposed. Tests for each application purpose are developed. Finally, a cost-benefit analysis is performed for each calibration procedure to establish a balance between the desired level of accuracy and the time spent to achieve it.