Dose 2016

Need Accurate DVH’s…..

• Various metrics calculated from DVH – Calculation of biological indices • Used to correlate local control – Clinical Trial outcome analysis • Used to report dose homogeneity

• IMRT Optimisation (Dose Volume Constraints) • Used to correlate with morbidity for OAR’s – Clinical decisions are based on these

• Used to develop dose constraints for prospective treatment planning • Move from passing rates to DVH based QA metrics? • Accuracy in DVH construction essential – Need dose calculation to compute dose in small fields, inhomogeneous tissue, non-equilibrium regions – ‘Use of dose volume reporting is dependent on accurate dose calculation algorithms’ (ICRU83)

Utrecht 2016