Table 1.

Overview of daily quality assurance tests for a proton pencil beam scanning delivery system

	Test items
Safety	Door interlock (beam off)
	Audio/visual monitor(s)
	Intercom
	Beam on indicator
	Alarm indicator
	X‐ray on indicator
	Room radiation monitor
	Room search/clear button
	Beam pause
	Beam stop
	Beam delivery controller reset
	Collisional interlocks
Mechanical, imaging, and OIS connectivity	Laser localization
	Imaging and treatment coordinate coincidence
	Positioning/repositioning (translational & rotational)
	Gantry angle
	Range shifter detection
	Dual source kV‐kV x‐ray image acquisition
	CBCT acquisition
	Connectivity between OIS and delivery unit software
	X‐ray vs surface imaging isocenter coincidence
Dosimetry	Spot position
	Spot sigma
	Spot skewness
	Distal range
	Proximal range
	Width
	Distal‐fall‐off (DFO)
	Imaging vs proton beam isocenter coincidence
	Field homogeneity
	Dose output