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Intra-fraction displacement of bone and tumor
• Displacement of tumor
during treatment (40
minutes) can be up to 6
mm
• Part of this is due to
motion of the patient’s
bony anatomy
• Part is due to base-line
shift
• Correlation is high in L-R
direction, poorer in other
directions
Sonke et al. 2008. Int J Radiat Oncol
Biol Phys. 74:567-574