72 / 754
Looking around
Copenhagen
– QC showed 5% deviation in output - was adjusted
immedeatly
o
Linac OK but incorrect calibration factor for ion chamber – detected
after several weeks even if in-vivo dosimetry was in placed (however,
lack of comprehensive analysis)
o
No second physicist checked QC
Ottawa
– Recommissioning of unit after move – missed back scatter
factors
o
No second physicist
o
Detected when annual QC was done
Touluse/Ohio
– Commissioning of SRT with unsuitable ion chamber
o
No second physicist
o
Detected by company
…
37
2016-10-05
T Knöös
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