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ESTRO IMRT course 2015
Adaptive Radiotherapy
Brussels October 8th, 2015
-25-
CTV_hull = hull of 3-5 prostate contours
(planning CTV and first days of
treatment)
alternative approach:
constraints to Rectum_hull = hull of 3-5 rectum
contours, no PRV margin
PTV = CTV_hull + patient-individual margin,
adapted according to setup errors
measured during first 5 fractions
(~5mm)
The Beaumont offline adaptive RT approach:
Eliminate systematic errors of the organ geometry!
corresponding rectum contours of the first
3-5 treatment days;
Beaumont approach: dose constraint to
rectal-wall structure as in planning CT