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Bladder IGRT
Average translation
(mm)
Systematic error
Σ
(mm)
Random error
σ
(mm)
Left-Right
0.8
1.5
2.4
Cranial-Caudal
-1.7
5.3
4.4
Anterior-Posterior
-0.4
3.9
4.4
Range (mm)
3D-vector
7.8
0.6 - 32.7
• 24 patients
• Very large shifts observed
• Required margin: 13 mm