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VMAT and RapidArc
 VMAT and RapidArc adds more degrees of freedom to the treatment plan
 Simultaneous gantry rotation and irradiation
 Variable gantry speed
 Variable dose rate
 Test 1: MLC movement during gantry rotation
 Leaf gap 1 mm
 Continuous gantry rotation
 MLC moves 2 cm and stops
C. Clifton Ling, Pengpeng Zhang, Yves Archambault, Jiri Bocanek, Grace Tang, M. Phil, and Thomas Losasso,
Commissioning And Quality Assurance Of Rapidarc Radiotherapy Delivery System Int. J. Radiation Oncology
Biol. Phys., Vol. 72, No. 2, Pp. 575–581, 2008