AlNaemi Huda, Tsapaki Virginia, Omar Ahmed J, AlKuwari Maryam, AlObadli Amal, Alkhazzam Shady, Aly Antar, Kharita Mohammad Hassan
Hamad Medical Corporation, 3050, Doha, Qatar.
Weill Cornell Medicine, 24144, Doha, Qatar.
Eur J Radiol Open. 2020 Oct 28;7:100282. doi: 10.1016/j.ejro.2020.100282. eCollection 2020.
The objectives of this study were to: 1) evaluate patient radiation exposure in CT and 2) establish CT Diagnostic Reference Levels (DRL)s based on clinical indication (CI) in Qatar.
Patient data for 13 CIs were collected using specially designed collection forms from the dose management software (DMS) of Hamad Medical Corporation (HMC), the main Qatar healthcare provider. The methodology described in the International Commission on Radiological Protection (ICRP) Report 135 was followed to establish national clinical DRLs in terms of Volumetric Computed Tomography Dose Index (CTDIvol) and total Dose Length Product (DLPt). Effective dose (Ef) was estimated by DMS using DLPt and appropriate conversion factors and was analyzed for comparison purposes.
Data were retrospectively collected for 896 adult patients undergoing CT examinations in 4 hospitals and 7 CT scanners. CT for Diffuse infiltrative lung disease imparted the lowest radiation in terms of CTDIvol (5 mGy), DLPt (181 mGy.cm) and Ef (3.6 mSv). Total body CT for severe trauma imparted the highest DLPt (3137 mGy.cm) and Ef (38.6 mSv) of all CIs with a CTDIvol of 15 mGy. Rounded Third quartile CTDIvol and DLPt values were defined as the Qatar CT clinical DRLs. Comparison was limited due to sparse international literature. When this was possible data were lower or comparable with other studies.
This is the first study reporting national clinical DRLs in Asia and second one internationally after UK. For accurate comparison between studies, systemized CI nomenclature must be followed by researchers.
本研究的目的是：1）评估CT检查中患者的辐射暴露情况；2）根据卡塔尔的临床指征（CI）建立CT诊断参考水平（DRL）。
使用专门设计的收集表，从卡塔尔主要医疗服务提供商哈马德医疗公司（HMC）的剂量管理软件（DMS）中收集13种临床指征的患者数据。遵循国际放射防护委员会（ICRP）第135号报告中描述的方法，以容积CT剂量指数（CTDIvol）和总剂量长度乘积（DLPt）为指标建立国家临床DRL。DMS使用DLPt和适当的转换因子估算有效剂量（Ef），并进行分析以作比较。
回顾性收集了4家医院7台CT扫描仪对896例成年患者进行CT检查的数据。就CTDIvol（5 mGy）、DLPt（181 mGy.cm）和Ef（3.6 mSv）而言，弥漫性浸润性肺病的CT检查辐射最低。在所有临床指征中，严重创伤的全身CT检查的DLPt（3137 mGy.cm）和Ef（38.6 mSv）最高，CTDIvol为15 mGy。四分之三CTDIvol和DLPt值的整数近似值被定义为卡塔尔CT临床DRL。由于国际文献稀少，比较有限。在可能的情况下，数据低于或与其他研究相当。
这是亚洲第一项报告国家临床DRL的研究，在国际上仅次于英国。为便于研究之间的准确比较，研究人员必须遵循系统化的临床指征命名法。
