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

IF 0.7 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

SA Journal of Radiology Pub Date : 2024-01-31 eCollection Date: 2024-01-01 DOI:10.4102/sajr.v28i1.2809

Filip M Kozłowski, Christoffel J van Reenen, Christoph J Trauernicht

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引用次数: 0

Abstract

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 (CTDI_vol) and dose-length product (DLP) values. The findings were compared with DRLs established internationally.

Results: Ingenuity median CTDI_vol was 20 mGy and DLP was 2169 mGy*cm; Somatom median CTDI_vol 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 CTDI_vol 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; CTDI_vol: 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.

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在一家三级医院建立当地 CT 结肠造影诊断参考水平。

背景：诊断参考水平（DRLs）是识别诊断检查中异常高辐射剂量的重要指标。南非目前还没有针对 CT 结肠造影的国家 DRL，但正在努力为国家 DRL 项目收集数据：本研究调查了南非一家大型三甲医院成年患者 CT 结肠成像的辐射剂量，目的是制定当地的 DRL：从医院的图片存档和通信系统（PACS）中获取了 2020 年 3 月至 2023 年 3 月期间两台 CT 扫描仪（飞利浦 Ingenuity 和西门子 Somatom go.Top）的患者数据（n = 115）。分析包括确定计算机断层扫描剂量指数-体积（CTDIvol）和剂量-长度乘积（DLP）的中位值。分析结果与国际上确定的 DRL 进行了比较：结果：Ingenuity的中位CTDIvol为20 mGy，DLP为2169 mGy*cm；Somatom的中位CTDIvol为6 mGy，DLP为557 mGy*cm。Ingenuity 超出英国（UK）建议的 DRL 分别达 82% 和 214%。Somatom的CTDIvol和DLP中值分别比英国的NDRL低45%和19%：结论：Somatom的锡过滤器和其他降低剂量功能可显著降低剂量。这些数据被用于设定医院 CT 结肠造影的 DRL；CTDIvol：6 mGy，DLP：557 mGy*cm：除了为机构一级的辐射防护实践提供信息外，制定的本地 DRL 还有助于实施地区和国家 DRL。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

SA Journal of Radiology RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-

CiteScore

1.20

自引率

11.10%

发文量

审稿时长

16 weeks

期刊介绍： The SA Journal of Radiology is the official journal of the Radiological Society of South Africa and the Professional Association of Radiologists in South Africa and Namibia. The SA Journal of Radiology is a general diagnostic radiological journal which carries original research and review articles, pictorial essays, case reports, letters, editorials, radiological practice and other radiological articles.