Physics Bucharest 2017

Measurement and action protocol

EPID dosimetry results from NKI* based on 5547 patients (16986 fractions) %Isocentre difference <5% Gamma <1 >70%

NKI experience is ~90% of patients will be within criteria

ICRU 83: 5 % was the original ICRU requirement for accuracy of delivery at the ICRU Reference Point (ICRU, 1993). For high-gradient (>20 %/cm) regions, the accuracy of DTA should be 3.5 mm In the future, the recommended accuracy criteria might be made more stringent

*Reference: I Olaciregui_Ruiz et all Radiotherapy and Oncology 2011