Initial viability: A qualitative comparison of automated and
manually analysed results showed good agreement and demonstrated a time saving
Sensitivity testing: Picket fence leaf offset measured with
SunCEHCK Machine 0.58mm (0.5mm expected). VMAT QA – DR+GS first section
measured 10.6% lower (9.01% expected), LS measured 2.1% lower (expected 2.01%).
Flatness (variance definition) 2.5% (0cm solid water), 2.8% (1cm), 3.0%(2cm),
3.3% (3cm). The measured mean change in symmetry (normalised point difference
definition) 0.88% (expected 1%). Field size, mean difference from expected
0.03mm. WL mean measured offset in X, Y, Z 0.81mm (1mm expected).
Commissioning: The process described was successful, although
bugs were identified and reported. QA templates cannot easily be secured once
set up. Although templates can be copied, they lose association, meaning future
changes need to be made to all templates.
Long Term use: For 12 months the platform has successfully completed
all QA across 9 linacs, >95% without intervention. Troubleshooting guides
were produced for routine issues e.g. smooth profiles, adjust image
registration, etc. SunCHECK Machine has enabled quantitative analysis of
imaging tests where previous qualitative analysis was used.
Time Saved: SunCHECK machine has saved 22hours and 43mins,
per linac, per year. (Details in table)