Rawashdeh Mohammad, Saade Charbel
Department of Allied Medical Sciences, 108612Jordan University of Science and Technology, Irbid, Jordan.
Medical Imaging Sciences, Faculty of Health Sciences, University College Cork, Cork, Ireland.
Acta Radiol. 2023 Feb;64(2):829-836. doi: 10.1177/02841851221095238. Epub 2022 May 3.
Increased radiation doses from computed tomography (CT) examinations is well known with proven risks of inducing cancers for effective dose >100 mSv (according to some studies >50 mSvs).
To establish the diagnostic reference level (DRL) for low-dose renal CT examinations in the evaluation of renal stones.
Patient demographics, CT parameters, and dosimetric indices (CTDI and dose length product [DLP]) were collected from 12 tertiary hospitals that routinely perform renal CT in the detection and evaluation of renal stones over a period of 12 weeks. Data obtained from 1418 average-sized patients in each category were recorded. The median values of dosimetric indices for each site were calculated. The DRL values were defined as the 75th percentile of the distribution of the median values of CTDI and DLP.
There were no significant differences between patient demographics. Mean kVp and mAs for protocols were 121.67 ± 11.56 and 226.91 ± 78.44, respectively. The CTDI values were in the range of 2-36.2 mGy, while the DLP values were in the range of 43-1942 mGy.cm. The DRL for the CTDI was 16.15 mGy and for the DLP 851.77 mGy.cm. The local median values of CDTI and DLP are higher than DRL in two hospitals.
Comparison of local median values of CDTI and DLP with DRL suggests the needs of an optimization strategy in some hospitals.
计算机断层扫描（CT）检查辐射剂量增加是众所周知的，有效剂量>100 mSv（根据一些研究>50 mSv）有诱发癌症的风险已得到证实。
建立低剂量肾脏CT检查在评估肾结石中的诊断参考水平（DRL）。
从12家三级医院收集患者人口统计学数据、CT参数和剂量学指标（CT剂量指数[CTDI]和剂量长度乘积[DLP]），这些医院在12周的时间里常规进行肾脏CT检查以检测和评估肾结石。记录每个类别中1418名平均体型患者的数据。计算每个部位剂量学指标的中位数。DRL值定义为CTDI和DLP中位数分布的第75百分位数。
患者人口统计学数据之间无显著差异。各方案的平均管电压（kVp）和管电流时间乘积（mAs）分别为121.67±11.56和226.91±78.44。CTDI值在2 - 36.2 mGy范围内，而DLP值在43 - 1942 mGy·cm范围内。CTDI的DRL为16.15 mGy，DLP的DRL为851.77 mGy·cm。两家医院的CTDI和DLP局部中位数高于DRL。
将CTDI和DLP的局部中位数与DRL进行比较表明，一些医院需要优化策略。
