IMRT 2018

Gamma analysis clinically relevant?

• Studies have shown that clinically relevant parameters do not correlate well with gamma pass-rates (Nelms et al. MedPhys 2011, Carver et al. RadiatOncol 2011) • Dose deviation tolerance usually at a few percent • Tumour control probability depends strongly on the dose deviation • Comparison of isodoses is important for critical organs-at-risk • Not sensitive to small systematic differences

06/06/2018