TVD 2016

Prescribing

• Specify median dose ‐ D median

= D 50 % 

Corresponds best to previous ICRU reference point dose        (≈ isocentre dose)

• Often close to mean dose • Not influenced by ‘tails’ on the DVH • Acc ratel calc lated in TPSs u y  u  

NB useful to add units e.g D 50 % 

or V 20 Gy