Department of Radiology, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium.
Department of Radiology, Ghent University, Corneel Heymanslaan 10, 9000, Ghent, Belgium.
Eur J Radiol. 2019 Feb;111:81-87. doi: 10.1016/j.ejrad.2018.12.019. Epub 2018 Dec 24.
This study aims to evaluate the radiation exposure to patients undergoing an abdominopelvic or a chest and abdominopelvic (trunk) CT examination and to assess compliance to imaging referral guidelines.
To this end, 357 standard abdominopelvic and trunk CT scans were collected from 8 Belgian institutions in 2011 and 2015. Effective dose (E) and collective dose were calculated using CT dose descriptors (CTDI and DLP), which were obtained from dose reports generated by the CT scanner. Subsequently, these CT requests were compared against the national referral guidelines to assess compliance. Population estimates for dose and compliance were obtained using multilevel linear regression and generalized estimating equation models.
Between 2011 and 2015, a significant decrease of 28% in CTDI and DLP was found for abdominopelvic CT. The corresponding E decreased by 27%, and the collective dose by 23%. For trunk CT, a non-significant decrease of 6% was found in CTDI and a significant decrease of 14% in both DLP and E. However, the collective dose of trunk examinations increased by 39%. In 2011, 24% of the abdominopelvic examinations were not compliant with the guidelines, whereas this percentage dropped to 17% in 2015. Non-justified examinations accounted for 8% and 12% of all trunk CT scans in 2011 and 2015, respectively.
Between 2011 and 2015, there was a decrease in dose for patients undergoing abdominopelvic or trunk CT in Belgium. However, a fraction of the estimated doses are linked to unnecessary CT examinations, which should be avoided.
本研究旨在评估行腹盆部或胸部加腹盆部（躯干） CT 检查的患者的辐射暴露量，并评估其对影像学转诊指南的遵从性。
为此，我们于 2011 年和 2015 年从比利时的 8 家机构收集了 357 例标准的腹盆部和躯干 CT 扫描。有效剂量（E）和集体剂量是使用 CT 剂量指标（CTDI 和 DLP）计算的，这些指标是从 CT 扫描仪生成的剂量报告中获得的。随后，将这些 CT 请求与国家转诊指南进行比较，以评估其遵从性。使用多层线性回归和广义估计方程模型获得剂量和遵从性的人群估计值。
在 2011 年至 2015 年间，腹盆部 CT 的 CTDI 和 DLP 分别显著下降了 28%。相应的 E 下降了 27%，集体剂量下降了 23%。对于躯干 CT，CTDI 下降了 6%，但 DLP 和 E 分别显著下降了 14%。然而，躯干检查的集体剂量增加了 39%。2011 年，24%的腹盆部检查不符合指南，而 2015 年这一比例下降到 17%。2011 年和 2015 年，分别有 8%和 12%的非正当检查占所有躯干 CT 扫描的比例。
在 2011 年至 2015 年间，比利时行腹盆部或躯干 CT 的患者的剂量有所下降。然而，一部分估计剂量与不必要的 CT 检查有关，应予以避免。
