Filiz Süleyman, Gürel Safiye, Gürel Kamil
Bolu Abant Izzet Baysal University Faculty of Medicine, Department of Radiology, Bolu, Turkey.
Ankara Gazi Mustafa Kemal Occupational and Environmental Diseases Hospital, Department of Radiology, Ankara, Turkey.
Diagn Interv Radiol. 2024 Feb 20. doi: 10.4274/dir.2024.232551.
Our study aimed to obtain clinical indication-based typical dose values and size-specific dose estimates (SSDEs) for multiphasic abdominopelvic computed tomography (CT) examinations and to review our data with published diagnostic reference levels (DRLs).
In this retrospective study, multiphasic liver, kidney, pancreas, and mesenteric ischemia protocol CT scans performed at our center between January 2018 and December 2021 were analyzed. The clinical indications were hepatocellular carcinoma, renal cell carcinoma, pancreas adenocarcinoma, and mesenteric ischemia. The computed tomography dose index volume (CTDI) and dose-length product (DLP) values were recorded, and the SSDE and effective dose (ED) values were calculated. The water-equivalent diameter (Dw) value required for the SSDE calculation was measured using the automated calculation of the Dw program.
The total number of patients was 514, with 86 patients excluded from this study. The dose values were calculated for 426 patients (183 female and 243 male; 111 liver, 120 kidney, 85 pancreas, and 110 mesenteric). The median values for the CTDI, DLP, SSDE, and ED were 6.86 mGy, 683.02 mGy. cm, 8.75 mGy, and 10.45 mSv for the liver CT; 8.37 mGy, 908.37 mGy.cm, 10.37 mGy, and 13.89 mSv for the kidney CT; 7.82 mGy, 517.98 mGy.cm, 10.01 mGy, and 7.92 mSv for the pancreas CT; and 9.48 mGy, 983.68 mGy.cm, 12.78 mGy, and 13.86 mSv for the mesenteric CT, respectively. All dose values were lower than the published DRLs.
The literature reveals large differences in the multiphasic abdominopelvic CT protocols, especially in the number of phases and scan length. This situation makes comparing dose values difficult. Dose studies revealing the protocol parameters in detail are needed so that institutions can compare and optimize their own protocols. Additionally, users should periodically check the dose values in their own institutions.
我们的研究旨在获取基于临床指征的多期腹部盆腔计算机断层扫描（CT）检查的典型剂量值和特定尺寸剂量估计值（SSDEs），并将我们的数据与已发表的诊断参考水平（DRLs）进行比较。
在这项回顾性研究中，分析了2018年1月至2021年12月在我们中心进行的多期肝脏、肾脏、胰腺和肠系膜缺血方案CT扫描。临床指征为肝细胞癌、肾细胞癌、胰腺腺癌和肠系膜缺血。记录计算机断层扫描剂量指数体积（CTDI）和剂量长度乘积（DLP）值，并计算SSDE和有效剂量（ED）值。使用Dw程序的自动计算测量SSDE计算所需的水等效直径（Dw）值。
患者总数为514例，其中86例被排除在本研究之外。计算了426例患者（183例女性和243例男性；111例肝脏、120例肾脏、85例胰腺和110例肠系膜）的剂量值。肝脏CT的CTDI、DLP、SSDE和ED的中位数分别为6.86 mGy、683.02 mGy·cm、8.75 mGy和10.45 mSv；肾脏CT分别为8.37 mGy、908.37 mGy·cm、10.37 mGy和13.89 mSv；胰腺CT分别为7.82 mGy、517.98 mGy·cm、10.01 mGy和7.92 mSv；肠系膜CT分别为9.48 mGy、983.68 mGy·cm、12.78 mGy和13.86 mSv。所有剂量值均低于已发表的DRLs。
文献显示多期腹部盆腔CT方案存在很大差异，尤其是在期数和扫描长度方面。这种情况使得比较剂量值变得困难。需要详细揭示方案参数的剂量研究，以便各机构能够比较和优化自己的方案。此外，用户应定期检查自己机构中的剂量值。
