Gynae BT 2017
Skin marks versus daily bony registration
Daily image guidance with bony fusion
CT
Initial set-up according to skin marks
Image fusion according to bone
Verification of fusion
CBCT
Couch correction
Typically 5mm PTV margin
Set-up on skin marks (no daily image guidance):
Imaging at first RT or e.g. weekly Typically 7-10mm PTV margin
Vertical [mm]
Lateral [mm]
Longitudinal [mm]
Variable
Mean (M)
0,4
2,7
0,4
Σ
3,6
2,9
2,6
σ
3,6
3,2
2,4
Margin*
11,6
9,6
8,2
*Van Herk formalism: 2,5*Σ+0,7*σ Semin Radiat Oncol 2004; 14:52-64
L.Laursen, RO 105 (2012) 220–225
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