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I
nter-fraction motion
of primary GTV
GTV
CTV
PTV
•
5 consecutive MRI’s during EBRT
•
Impact of changes in bladder and
bowel filling on position changes of
uterus
•
Not only one organ is responsible
Low impact
Low impact
High impact
of bladder
and bowel
High impact
of bladder
Target (CTV-T) motion during EBRT