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Margins?
• Bladder patients with full bladder instruction and cranially located
tumor:
–
σ
translations
= 1.1 cm
–
Σ
translations
= 1.1 cm
–
σ
rotations+shape
= 0.3 cm
–
Σ
rotations+shape
= 0.3 cm
• Consequence
*
:
– PTV Margin: 4 cm!!!
*
Margin = 2.5 •
Σ
+ 0.7 •
σ
= 4 cm
GTV
CTV
PTV(4)