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Computed tomography coronary angiography (CTCA) utilizing a 64-slice scanner has been promoted for its diagnostic sensitivity and specificity, particularly in patients with intermediate pretest probability of disease, and as a noninvasive alternative to standard coronary angiography, which is associated with a 1.7% risk for major complications, including stroke and death. Little, however, is known about the cancer risk from CTCA. Using complex computer modeling methods, investigators estimated the radiation dose to individual organs in males and females from a single CTCA study and estimated cancer risks from those doses. They tested a standard CTCA protocol and a protocol using electrocardiographically controlled tube-current modulation (E…