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6

Skin marks versus daily bony registration

Daily image guidance with bony fusion

Initial set-up according to skin marks

Image fusion according to bone

Verification of fusion

Couch correction

Typically 5mm PTV margin

Set-up on skin marks (no daily image guidance):

Imaging at first RT or

e.g. weekly

Typically 8-10mm PTV

margin

L.Laursen, RO 105 (2012) 220–225

Variable

Vertical

[mm]

Lateral

[mm]

Longitudinal

[mm]

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

CT

CBCT