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- imaging in limited number of fractions (at least first N fractions)
- measured errors are
only
used for correction in future fractions
- corrections not used same day
off-line image analysis
OFF-LINE
protocols
in all fractions
= patient’s systematic set-up error,
= random error in fraction
of
measured
, only -component is relevant for future fractions
use
measured
to estimate
correct in future fractions with estimate of
AIM
: reduction of
systematic
set-up errors