title: Effective doses in standard protocols for multi-slice CT scanning.
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 (4x1, 4x2.5, and 4x5 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.
authors.affiliation: Institute of Diagnostic Radiology, University Hospital, Heinrich Heine University, Moorenstrasse 5, 40225 Düsseldorf, Germany. cohnen @ med.uni-duesseldorf.de
authors.forename: Mathias
authors.initials: M
authors.lastname: Cohnen
authors.forename: LudgerG J W
authors.initials: LJ
authors.lastname: Poll
authors.forename: Claudia
authors.initials: C
authors.lastname: Puettmann
authors.forename: Klaus
authors.initials: K
authors.lastname: Ewen
authors.forename: Andreas
authors.initials: A
authors.lastname: Saleh
authors.forename: Ulrich
authors.initials: U
authors.lastname: Mödder
mesh_terms: D000005:Abdomen / Q000528:radiation effects; D004064:Digestive System / Q000528:radiation effects; D005260:Female; D006066:Gonads / Q000528:radiation effects; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D009333:Neck / Q000528:radiation effects; D011829:Radiation Dosage; D012737:Sex Factors; D013223:Statistics as Topic; D013909:Thorax / Q000528:radiation effects; D013961:Thyroid Gland / Q000528:radiation effects; D015898:Tomography Scanners, X-Ray Computed / Q000592:standards*; D001743:Urinary Bladder / Q000528:radiation effects