Effective doses in standard protocols for multi-slice CT scanning |
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| Authors: | Cohnen Mathias Poll LudgerG J W Puettmann Claudia Ewen Klaus Saleh Andreas Mödder Ulrich |
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| Institution: | (1) Institute of Diagnostic Radiology, University Hospital, Heinrich Heine University, Moorenstrasse 5, 40225 Düsseldorf, Germany,;(2) State Institute for Occupational Safety and Health of North Rhine-Westfalia, 40225 Düsseldorf, Germany, |
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| Abstract: | The purpose of this study was to assess the radiation exposure of patients in several standard protocols in multi-slice CT
(MSCT). Scanning protocols for neck, chest, abdomen, and spine were examined on a Somatom Plus 4 Volume Zoom MSCT (Siemens,
Erlangen, Germany) with changing slice collimation (4×1, 4×2.5, and 4×5 mm), and pitch factors (1, 1.5, and 2). Effective
doses were calculated from LiF–TLD measurements at several organ sites using an Alderson-Rando phantom and compared with calculations
using the weighted CTDI. Effective dose for MSCT of the neck was 2.8 mSv. For different protocols for MSCT of the chest, 7.5–12.9 mSv
were found. In abdominal MSCT protocols, effective dose varied between 12.4 and 16.1 mSv. The MSCT of the spine may lead to
12 mSv. An excellent correlation between the effective dose as determined by LiF–TLD and the calculated effective dose using
the weighted CTDI could be demonstrated; however, a difference of up to 30% (mean 14.3%) was noted. Standard protocols for
MSCT as measured in this study showed effective doses of up to16 mSv. Phantom measurement data show a good correlation to
estimations using the weighted CTDI.
Electronic Publication |
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| Keywords: | Radiation exposure Multi-slice CT Effective dose Alderson-Rando phantom |
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