The number of computed tomography (CT) examinations and new indications for CT are increasing in frequency worldwide. While CT makes up only 4% of medical examinations, it might contribute as much as 40% of the total collective radiation dose to the population. Radiologists and referring clinicians should make sure that the CT examination is indicated. Doses can often approach or exceed levels known to increase the probability of cancer. This is especially relevant in children where dose reductions of up to 80% can be obtained by adjusting the exposure factors. The most important factors are decreased milliampere seconds (mAs) and increased pitch.

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