Table 1.

Linear accelerator acceptance tests and specifications. External references for tests and specifications are shown in brackets

Section	Description	Phantom	Specification
A1	Safety
	Inhibit systems
A2	Radiation shielding
	Scattered radiation to the patient	Mini‐phantom	ave < 0.1% of in‐field dose (IEC 60601‐2‐1)
	Bunker protection		<1.0 mSv/year
A3	Coordinate systems and data integrity
	Radiation beam and beam shaping (IEC61217)
	MVI (IEC61217)
	MRI (DICOM)
A4	MVI
	Panel rigidity	Ball bearing	<0.3 mm
	Rotational alignment	Water phantom	<0.2o
	Pixel scale and isocenter	Elekta pixel tool, MV alignment phantom
	Image quality	QC3, Las Vegas
A5	Mechanical and dosimetric alignment of gantry, focal spot and beam
	Gantry tilt	Spirit level	<0.2o
	Gantry rotation and readout	Spirit level and spoke film	<0.2o
	Beam alignment	Film, water phantom	<1 mm and <0.2o
	Isocenter locus	Film	<0.5 mm radius
A6	Mechanical and dosimetric alignment of MLC and jaws
	MLC stripe test	Film, MVI	<0.5 mm (TG 142)
	MLC transmission	Film, water phantom	<0.5% from baseline/TPS (TG142)
	Jaw stripe test	Film, MVI	<1 mm (TG 142)
	Gantry angle dependency	Film, MVI	<0.5 mm (TG 142)
A7	Table
	Orthogonality and movement	MVI	<1° and <2 mm (TG 142)
A8	Laser — Elekta indicative sagittal laser	Ball bearing	<1 mm (TG 142)
A9	MR to MV alignment	Elekta MR‐MV alignment phantom	<0.3o (Elekta)
A10	Dosimetric system
	Output stability — short and long term	RW3	<2% (TG 142)
	2nd linac monitor chamber	RW3	<2% (TG 142)
	Linearity	RW3	<2% (TG 142)
	Dose rate dependency	RW3	<2% (TG 142)
	Output gantry angle and cryostat dependency	Mini‐phantom	<1% from baseline (TG 142)
	Profile constancy	StarCheckMaxi	<1% (TG 142)
	Profile gantry angle dependency	ICprofiler	<1% (TG 142)
	Internal monitoring and beam cutoff	ICprofiler	3%
	Reference dosimetry	Water phantom	<1% (NCS 18)
A11	Beam performance during MR imaging	Water phantom	<2%
A12	End‐to‐end test	Alderson phantom	γ (5%/2mm), 10% threshold, >90% pixels passed