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Is it possible to do intrafraction monitoring
with EPIDs ?
Tracking internal fiducials
Ø
Fiducials are visible with MV in Beams-Eye-View with EPID
in cine mode
Ø
Structures in the Beams-Eye-View can be used for image
correlation analysis
•Advantage: least dose
•Pitfall: restricted to 3D-CRT