ESTRO course on Image Guided Radiotherapy in Clinical Practice 2018

Is it possible to do intrafraction monitoring with EPIDs ?

Tracking internal fiducials

➢ Fiducials are visible with MV in Beams-Eye-View with EPID in cine mode ➢ Structures in the Beams-Eye-View can be used for image correlation analysis

•Advantage: least dose •Pitfall: restricted to beam opening