斯洛文尼亚放射治疗计算机断层扫描模拟程序国家诊断参考水平的建立。

Establishment of national diagnostic reference levels for radiotherapy computed tomography simulation procedures in Slovenia.

机构信息

University of Ljubljana, Faculty of Health Sciences, Medical Imaging and Radiotherapy Department, Zdravstvena pot 5, 1000, Ljubljana, Slovenia.

University of Ljubljana, Faculty of Health Sciences, Medical Imaging and Radiotherapy Department, Zdravstvena pot 5, 1000, Ljubljana, Slovenia; Institute of Oncology Ljubljana, Teleradiotherapy Department, Zaloška cesta 2, 1000 Ljubljana, Slovenia.

出版信息

Eur J Radiol. 2020 Jun;127:108979. doi: 10.1016/j.ejrad.2020.108979. Epub 2020 Apr 7.

DOI:10.1016/j.ejrad.2020.108979

PMID:32302897

Abstract

PURPOSE

To propose national diagnostic reference levels (DRLs) for radiotherapy (RT) computed tomography (CT) localization purposes, compare both CT units used in the largest RT department in the country and to compare gathered results with other published DRLs in order to discover any need of optimization.

METHODS

In total, 1631 patient data (time spend of 4 months) regarding sex, examination type, total dose-length product (DLP) and CTDI was collated on two CT units. Those simulation procedures account for more than 80 % of all simulation procedures performed nationwide. Then, total DLP and CTDI was calculated and mean, median and 3 quartile for both units together were presented to determine national DRLs for simulation procedures. The same data was later compared between both units to discover any potential need for optimization.

RESULTS

3 quartile values of DLP for abdomen, breast, chest, head, head and neck, pelvis and spine were 1116.2, 606.6, 832.4, 1942.4, 969.2, 677.1 and 1042.4 mGy∙cm, respectively. 3 quartile CTDI values for the same sequence of procedures were 18.7, 13.3, 19.2, 76.9, 22.6, 17.9 and 22.2 mGy, respectively. Among the two units, the mentioned dose values were on average significantly higher on one CT unit than on the other unit.

CONCLUSIONS

When comparing collected dose values with other studies, RT CT DRLs showed that radiation doses from our institution were similar or even lower. Some variations were found between both CT units in certain protocols, so exposure parameters should be reviewed and optimized.

摘要

目的

提出适用于放射治疗（RT）计算机断层扫描（CT）定位目的的国家诊断参考水平（DRL），比较全国最大的 RT 部门使用的两种 CT 设备，并将收集到的结果与其他已发表的 DRL 进行比较，以发现任何需要优化的地方。

方法

共收集了 1631 名患者的数据（耗时 4 个月），包括性别、检查类型、总剂量长度乘积（DLP）和 CTDI。这些模拟程序占全国所有模拟程序的 80%以上。然后，计算总 DLP 和 CTDI，并给出两个单位的平均值、中位数和三分位值，以确定模拟程序的国家 DRL。随后，将相同的数据在两个单位之间进行比较，以发现任何潜在的优化需求。

结果

腹部、乳房、胸部、头部、头颈部、骨盆和脊柱的 DLP 三分位值分别为 1116.2、606.6、832.4、1942.4、969.2、677.1 和 1042.4 mGy·cm。相同序列的 CTDI 值分别为 18.7、13.3、19.2、76.9、22.6、17.9 和 22.2 mGy。在这两个单位中，平均而言，一个单位的剂量值明显高于另一个单位。