IMRT Course 2016

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

ESTRO IMRT course 2016 Adaptive Radiotherapy London April 7th, 2016

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