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ESTRO IMRT course 2015
Adaptive Radiotherapy
Brussels October 8th, 2015
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Zero Margins in daily online ART/IGRT?
Intrafraction motion: prostate
A. N. T. J. Kotte et al. 2007: Intrafraction motion of the prostate during external-beam
radiation therapy: Analysis of 427 patients with implanted fiducial markers. IJROBP 69(2)
Motion of implanted fiducial markers as seen with PIs:
11426 fractions of 427 pts.
~5-7min after start of
treatment
•
intrafraction motion range >2mm in 66% of all fractions, >3mm in 28%
•
conclusion of the authors: lower limit of 2 mm for margins