From Eric Kvaalen
Jessica Hamzelou writes that because obese people receive a higher dose of X-rays in a CT scan, “they are 60 per cent more likely than those of average weight to develop the disease” (14 April, p 13). No – they are 60 per cent more likely to develop the disease as a result of the CT scan.
But CT scans only slightly increase the risk of cancer. The increased risk for obese people is 60 per cent of “slight”.
Les Essarts-le-Roi, France
