Course book Advanced Treatment Planning 2018

What happens in the other 99.6% ?

• There are many small unavoidable errors (mm size) in all steps of radiotherapy • In some cases many of these small errors point in the same direction • I.e., in some patients large (cm) errors occur(ed)

• This is not a fault, this is purely statistics

• What effect does this have on treatment? • We do not really know!