578 / 1544
ESTRO IMRT course 2015
Adaptive Radiotherapy
Brussels October 8th, 2015
-35-
RESULTS:
Without image guidance, margins of 0.57 cm, 0.79 cm and 0.77 cm, along the
left-right, superior-inferior and anterior-posterior axes respectively, are required
to give 95% probability of complete CTV coverage each day. With the above
image guidance strategy, these margins can be reduced to 0.36 cm, 0.37 cm
and 0.37 cm respectively. Correction of all isocenter placement errors,
regardless of size, would permit minimal additional reduction in margins.
Zero Margins in daily online ART/IGRT?
Intrafraction motion: prostate
D. Skarsgard et al. 2010: Planning target volume margins for prostate radiotherapy using
daily electronic portal imaging and implanted fiducial markers. Radiat Oncol. 5:52