IMRT 2018

Cyber knife

• Gantry, alignment of beam central axis to geometric iso-centre • End to end (E2E) test for all nodes

The E2E ballcube used for fiducial and cranial tracking tests. A hidden target is irradiated. The orthogonal films are analyzed for spatial accuracy of dose delivery and can also be used for film dosimetry as plan verification.

node

4 3 2 1

Beam originating from a node

Dieterich, MedPhys 38,2011. Report of AAPM TG 135: Quality assurance for robotic radiosurgery Lutz, IJROBPhys.14,1988.A system for stereotactic radiosurgery with a linear accelerator,