Establishment of local diagnostic reference levels for CT colonography at a tertiary hospital

SA Journal of Radiology

Field Value
Title Establishment of local diagnostic reference levels for CT colonography at a tertiary hospital
Creator Kozłowski, Filip M. van Reenen, Christoffel J. Trauernicht, Christoph J.
Subject Medical physics; dosimetry;radiology; optimisation computed tomography; CT; colonography; dose optimisation; diagnostic reference level; computed tomography dose index-volume; dose-length product.
Description Background: Diagnostic reference levels (DRLs) are an important metric in identifying abnormally high radiation doses in diagnostic examinations. National DRLs for CT colonography do not currently exist in South Africa, but there are efforts to collect data for a national DRL project.Objectives: This study investigated radiation doses for CT colonography in adult patients at a large tertiary hospital in South Africa with the aim of setting local DRLs.Method: Patient data from two CT scanners (Philips Ingenuity and Siemens Somatom go.Top) in the period March 2020 – March 2023 were obtained from the hospital’s picture archiving and communication system (PACS) (n = 115). Analysis involved determining the median computed tomography dose index-volume (CTDIvol) and dose-length product (DLP) values. The findings were compared with DRLs established internationally.Results: Ingenuity median CTDIvol was 20 mGy and DLP was 2169 mGy*cm; Somatom median CTDIvol was 6 mGy and DLP was 557 mGy*cm. Ingenuity exceeded the United Kingdom’s (UK) recommended DRLs by 82% and 214%, respectively. Somatom median CTDIvol and DLP were 45% and 19% lower than UK NDRLs.Conclusion: Somatom’s tin filter and other dose reduction features provided significant dose reduction. These data were used to set DRLs for CT colonography at the hospital; CTDIvol: 6 mGy and DLP: 557 mGy*cm.Contribution: In addition to informing radiation protection practices at the level of the institution, the established local DRLs contribute towards implementing regional and national DRLs.
Publisher AOSIS
Date 2024-01-31
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Retrospective study
Format text/html application/epub+zip text/xml application/pdf
Identifier 10.4102/sajr.v28i1.2809
Source South African Journal of Radiology; Vol 28, No 1 (2024); 5 pages 2078-6778 1027-202X
Language eng
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Coverage South Africa; Western Cape March 2020-March 2023 —
Rights Copyright (c) 2024 Filip M. Kozłowski, Christoffel J. van Reenen, Christoph J. Trauernicht