1096 / 1674
Action level
Residual error
Margin in mm
LAT LONG VERT
Skin mark
-
-
8.6
12.8
12.9
IGRT1
5 mm
0
5.5
4.9
4.8
IGRT2
5 mm
3 mm
5.9
6.8
6.7
IGRT3
3 mm
3 mm
4.9
5.8
5.8
58 patients - 9 fractions – kV helical CT verifications
automatic matching between planning and helical CTs using anatomical information
> 1 cm
CTV-PTV margins are needed in LONG and VERT directions at skin-mark setup
5-7 mm
margins can be applied with CT guidance performed before each fraction
IGRT with in-room helical kV CT