2017_SBRT_Course Book
Intrafractional motion
2 TYPES OF MOTION:
A: Slow drift motion Mainly posterioly and inferiorly Can reach large extends over long time periods Probably due to pelvic musculature relaxation or/and Gradually Moving rectal content B: Erractic motion Sudden and transient Often significant extend Probably related due to peristaltic motion
C: Combination of A and B
Langen et al, IJROBP, Volume 71, Issue 4 , 15 July 2008
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