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dc.contributor.authorTonkopi, Elena
dc.contributor.authorWikan, Eline Jahre
dc.contributor.authorHovland, Tor Olav
dc.contributor.authorHøgset, Sivert
dc.contributor.authorKofod, Thomas Alexander
dc.contributor.authorSefenu, Selasi K
dc.contributor.authorHughes-Ryan, Emily
dc.contributor.authorD'Entremont-O'Connell, Dakota
dc.contributor.authorGunn, Catherine
dc.contributor.authorHolter, Tanja
dc.contributor.authorJohansen, Safora
dc.identifier.citationTonkopi E, Wikan EJ, Hovland TO, et al. A survey of local diagnostic reference levels for the head, thorax, abdomen and pelvis computed tomography in Norway and Canada. Acta Radiologica Open. 2022;11(10). doi:10.1177/20584601221131477en_US
dc.description.abstractBackground Computed tomography (CT) contributes to 60% of the collective dose in medical imaging. Literature has demonstrated that patient dose varies across regions and countries. Establishing diagnostic reference levels (DRLs) contributes to the optimization of clinical practices and radiation protection. Purpose To survey the dose indices (CTDIvol and dose-length product) for frequently performed CT examinations from the chosen hospitals in Norway and Canada and to determine local DRLs (LDRLs) based on the collected data. Material and Methods The survey included eight scanners from two Norwegian hospitals and four scanners from four Canadian hospitals. Dosimetry data were collected for the following routine CT examinations: head, contrast-enhanced thorax, and abdomen and pelvis. Overall 480 adult average-sized patients from Norway and 360 from Canada were included in the survey. The LDRLs were determined as the 75th percentile of distributions of median values of dose indicators from different CT scanners. The differences in dose between scanners were determined using single-factor ANOVA. Results The LDRLs determined in Norway were higher overall than in Canada. The obtained values were compared to the national DRLs. The dose from several scanners in Norway exceeded national Norwegian DRLs, while Canadian LDRLs were below the Canadian reference levels. The differences between the means of the dose distributions from each scanner were statistically significant (p < 0.05) for all examinations with exception of identical scanners located in the same hospital and using the same protocols. Conclusion Observed dose variations even in the same hospital, or from the same scanner model confirmed the need for CT protocol optimization.en_US
dc.publisherSage Journalsen_US
dc.relation.ispartofActa Radiologica Openen_US
dc.titleA survey of local diagnostic reference levels for the head, thorax, abdomen and pelvis computed tomography in Norway and Canadaen_US
dc.rights.licenseLicensed under a Creative Commons Attribution-NonCommercial 4.0 License (CC BY-NC 4.0).
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