Appendix I.

Recommended frequencies for simulator QC tests

Test and frequency	Tolerance
Daily
Crosswires	1 mm
Optical distance indicator	2 mm
Isocentric lasers	1 mm
Optical/radiation field size (10 cm x 10 cm)	2 mm
Optical/radiation field alignment (10 cm x 10 cm)	1 mm
Monthly
Isocentricity of gantry	1 mm
Alignment of FAD movement	1 mm
Crosswire rotational 90 cm and 110 cm FAD	1 mm
Couch
Isocentricity of couch rotation	2 mm
Alignment of couch vertical movement	2 mm
Optical/radiation field sizes (all sizes)	2 mm/1.0%
Optical/radiation field alignment (all sizes)	1 mm/0.5%
Congruence of vertically and laterally opposed fields	1 mm
Positional readouts	1 mm/0.5%
Alignment of shadow trays	1 mm
Radiographic QC tests	see text
Six monthly
Fluoroscopic image quality	see text
Alignment of fine and broad focus radiographic images	0.5 mm
Annual
Redefine isocentre	1 mm
Crosswires and field wires at all gantry and diaphragm angles and FADs – all film	as above
Optical distance indicator at all gantry angles	2 mm
Gantry and diaphragm angles	0.5°
Loaded couch tests	see text
Full tests on fluoroscopic and radiographic system	see text

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