Analysis of Factors Influencing Patient Doses from CT in Norway

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Abstract
Based on the examination practices reported from 49 CT laboratories in Norway, the doses to the patients from seven types of CT examination were assessed. The mean effective doses were 2 mSv for examinations of the head, 10-13 mSv for examinations in the trunk region and 4.5 mSv for examinations of the lumbar spine. For any examination type the ratio between the highest and lowest effective dose ranged from 8 to 20. The total scan length and scanner model were the two most important variables. Each of them may explain about 30% of the observed total spread in dose for a given examination type. Similar spread in doses was found also when clinical indications were specified, even though there were examples of clinical indication associated with examinations of particular body regions which gave significantly different mean effective doses.

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