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Special Report |
1 From the CT Department, Konstantopoulio Agia Olga Hospital, 1 Ifaistou St, 14569 Anixi, Athens, Greece (V.T., C.T., P.N.M., J.P.); Department of Radiology, Vancouver Hospital, Vancouver, British Columbia, Canada (J.E.A.); Department of Radiology, All India Institute of Medical Sciences, New Delhi, India (R.S.); Poland Radiation Protection Department, Nofer Institute of Occupational Medicine, Lodz, Poland (M.A.S.); Department of Radiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand (A.K.); International Atomic Energy Agency, Vienna, Austria (M.R.); North Western Medical Physics, Christie Hospital NHS Trust, Manchester, England (A.H.); and Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands (M.P.). Received June 14, 2005; revision requested August 12; revision received September 2; accepted September 22; final version accepted November 23. Supported in part by the International Atomic Energy Agency through the coordinated research project Dose Reduction in Computed Tomography while Maintaining Diagnostic Confidence. Address correspondence to V.T. (e-mail: virginia{at}otenet.gr).
Purpose: To measure radiation doses for computed tomography (CT) of the head, chest, and abdomen and compare them with the diagnostic reference levels, as part of the International Atomic Energy Agency Research coordination project.
Materials and Methods: The local ethics committees of all participating institutions approved the study protocol. Written informed consent was obtained from all patients. All scanners were helical single-section or multi–detector row CT systems. Six hundred thirty-three patients undergoing head (n = 97), chest (n = 243), or abdominal (n = 293) CT were included. Collected data included patient height, weight, sex, and age; tube voltage and tube current–time product settings; pitch; section thickness; number of sections; weighted or volumetric CT dose index; and dose-length product (DLP). The effective dose was also estimated and served as collective dose estimation data.
Results: Mean volumetric CT dose index and DLP values were below the European diagnostic reference levels: 39 mGy and 544 mGy · cm, respectively, at head CT; 9.3 mGy and 348 mGy · cm, respectively, at chest CT; and 10.4 mGy and 549 mGy · cm, respectively, at abdominal CT. Estimated effective doses were 1.2, 5.9, and 8.2 mSv, respectively.
Conclusion: Comparison of CT results with diagnostic reference levels revealed the need for revisions, partly because the newer scanners have improved technology that facilitates lower patient doses.
© RSNA, 2006
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