Computed tomography (CT) has been proven to deliver high doses with a significant contribution to the collective effective dose of the population from medical exposure. A report of the European Commission reveals that mean effective doses from CT examinations in European countries vary from 0.3 mSv for Head in Moldova up to 50.5 mSv for Trunk in Denmark . The contribution of CT to the total collective effective dose from X-ray and nuclear medicine examinations for the group of countries from the European Union, Switzerland,...
Description of activity and work performed
Materials and Methods
The CT scanners included in the study are described in Table 1. Data on scanner manufacturer, model, year of manufacture, number of detector rows, use of iterative reconstruction and availability of automatic tube voltage selection are provided. Four Siemens SOMATOM Definition AS+ scanners with automatic tube voltage selection and tube current modulation (TCM), three of them with iterative reconstruction (IR), two Philips Ingenuity and one Philips Brilliance iCT 256 (all with TCM and IR) were included. Patient data were retrieved from the...
Conclusion and recommendations
Significant differences in protocol settings were observed. This lead to large difference of patient doses for some of the examinations, most probably due to the different TCM settings, although differences in slice thickness and pitch were also found. Additional optimisation of the CT examinations is needed with the initial step of standardisation of the protocols used. A work is ongoing to standardise all the protocols between all scanners.
S. Avramova-Cholakova; London/UK - nothing to disclose E. Kulama; London/UK - nothing to disclose
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3. Institute of Physics and Engineering in Medicine, 2004. Guidance on the establishment and use of diagnostic reference levels for medical X-ray examinations. IPEM report 88.
4. International Commission on Radiological Protection,...