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Considerations for IMRT
Typically characterised by:
highly conformal dose distributions;
steep dose gradients at edge of
PTV and OAR;
dose concavities to spare OAR;
multiple dose levels;
dose escalation.
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Potential advantages, but associated risks.
A small positional change can translate to a large dosimetric
difference – risk of underdosing PTV, or overdosing OAR.
Assessing impact of changes may be less intuitive
compared with conformal techniques.