Published in:
Open Access 01-06-2013 | Original Article
A national survey on radiation dose in CT in The Netherlands
Published in: Insights into Imaging | Issue 3/2013
Login to get accessAbstract
Objectives
To assess radiation exposure due to CT in the Netherlands.
Methods
Twenty-one hospitals participated in a dose survey for the 21 most frequently used CT protocols. Hospitals completed a Web survey with detailed parameters for one patient per protocol, including the dose length product (DLP) from the scanner dose report. Only standard-sized patients (1.74 m and 77 kg and BMI 25.4 kg/m2 ± 15 %) for each protocol and available scanner were considered. Effective dose (E) per protocol was estimated using ICRP-103-based E/DLP coefficients. Dose levels were compared to surveys from other countries and to diagnostic reference levels.
Results
Data of 186 patients (247 scan phases) from 14 hospitals and 19 scanners were used for final analysis of DLP and E. Effective doses varied from 0.2 mSv in sinus CT to 19.4 mSv for multiphase liver. The most frequent exams were brain (1.5 mSv), abdomen (8.0 mSv), and thorax-abdomen (11.5 mSv). These results are lower than in Germany and comparable to those in the UK, and are within reference levels. Results between hospitals varied, with per protocol minimum/maximum E ratios ranging from 1.1–5.4.
Conclusions
Compared to surrounding countries, CT in the Netherlands is associated with relatively low radiation doses in standard patients. Important differences remain between hospitals.
Main Messages
• A national dose survey providing updated, detailed data for patient dose in the most frequently used CT protocols.
• CT in the Netherlands is associated with relatively low individual radiation doses in standard patients compared to surrounding European countries.
• Considerable differences remain between hospitals for the most frequently used CT protocols, indicating the need for further optimisation.