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Should IMRT patient QC be done field-by-field or
for the composite plan?
❑
Assume a 5 field plan each beam contributes with 1/5 to
the target
❑
Each beam are delivered within 3 % of calculation
❑
Except for one that is 15% off.
❑
This
plan
will not pass field-by-field QC
❑
For a composite plan you
will not
detect this, the plan is
within 3%!!!
Dublin 2018
36