915 / 1196
Margins for small leasions hypo fractionated
Adding up some/al the errors:
Delineation uncertainty
2 mm
Residual set up error after imaging (2D or 3D)
•
bone registration
0.5 mm
•
soft tissue changes
0.6 mm
Intrafraction motion
0.6 mm
PTV margin =
2.5
Σ
+
0.7
σ
1mm margin/ 0mm margin??
Literature show excellent local controle!