Course book Advanced Treatment Planning 2018

Prescribing

• Specify median dose - D

= D

median

50 %

➢ Corresponds best to previous ICRU reference point dose (≈ isocentre dose) ➢ Often close to mean dose ➢ Not influenced by ‘tails’ on the DVH ➢ Accurately calculated in TPSs

➢ Possible to move from isocentre dose (CRT) to median dose (IMRT) with confidence

• NB useful to add units e.g D

or V

50 %

20 Gy