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Do we need patient immobilization?
Immobilization
LR
(mm)
SI
(mm)
AP
(mm)
Σ
Yes
1.3
1.1
1.3
No
1.2
1.2
1.8
σ
Yes
1.4
1.4
1.6
No
1.3
1.5
1.8
Intra-fractional changes of the tumor position seen in CB-CT images
after treatment
Guckenberger 2007
Sonke 2009
Assuming gross motion in 1% of the fractions:
➢
Limited relevance in conventionally fractionation (blurring)
Pulmonary SBRT