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Collimator rotation
Truebeam
Infinity
Truebeam
Vero
Vero
Tomotherapy
Gantry rotation
Novalis
Vero
Couch rotation
O-ring rotation
Gantry Wobble
All fields collimated with MLC
O-ring stability
Phys. Med. Biol. 57 (2012) 2997–3011)