Abstract
RATIONALE CT is an essential tool for the accurate diagnosis of disease and injury but is associated with radiation doses higher than those of conventional x-ray imaging. These higher doses and potential increased cancer risk have drawn the attention of popular media and the imaging community. Although high doses of radiation are known to increase the risk for cancer, the effects of the much lower doses used in diagnostic imaging, typically 50 mSv, are not conclusively known. The position of the International Commission on Radiological Protection [1] is that the dose-effect relationship is linear and that no threshold exists; however, recent publications havecalledthisintoquestion[2,3],
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