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Looker further – Calibration of TPS – Australia
The incident was discovered in 2006 when an independent measure of
machine output, external to the linear accelerator quality assurance process,
was performed to implement some new quality assurance software.
These measurements highlighted that there was an under-dosing of 5%
when they used data from TS3.
Further investigation at the time of the detection of this anomaly was able to
trace back to the TPS beam calibration ratio as the likely cause of the
consistent 5% dose discrepancy.
It involved 869 patients between 2004 and 2006.
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2016-10-05
T Knöös
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