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Some Remarks on Classical IGRT
1. State of the art is online setup corrections for tumors
that translate or rotate combined with intra-fraction
monitoring or correction
2. New is to use dynamic MLC for real-time tracking
3. IGRT is still challenging for tumors that are poorly
visible (abdomen) => implant fiducials or use MRI or
in-room CT
4. Not discussed here is the Calypso tracking system,
which puts beacons in the tumor