A questionnaire survey reviewing radiologists' and clinical specialist radiographers' knowledge of CT exposure parameters.

Insights Imaging · 2013 · PMC3781242 · PMID 24006206

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an obvious trendno p-value reported

Awareness of diagnostic reference levels Both groups were questioned regarding their knowledge of national diagnostic reference levels (DRLs) and an obvious trend was noted.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.