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”Worst case assumption”
Calculation of DVH for several fractions
DVH rectum
0
1
2
3
4
5
6
5
10
15
20
Dose (Gy)
Volume (%)
1. BT
2. BT
1
( )
l
( )
1. BT
2. BT
1. + 2. BT
+
=
Approximation
”Worst case assumption” or DVH addition