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Software upgrades: QA software
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QA phantom (Delta 4) for patient pre-treatment verification
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Software upgrade: No specifics given..
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After upgrade, new calibration method needed
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Ion chamber output modelled differently for small and large
fields
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Everything seemed ok, but..
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After some time, doing a statistical process analysis (trend
analysis), on average lower pass rates were found.
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Still working on how to handle this issue…