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Organs and tumours in the pelvis region moves mainly due to changes in the
digestive system and filling of bladder and rectum from day-to-day. Example:
prostate, bladder, rectum, cervix.
Mainly inter-fraction positional variation
Typical values (1 SD) are 3 - 5 mm.
Positional variations
IGRT and margin
determination: Pelvic
treatment (Tuesday)