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Relative lifetime cancer risk in men (♂) and women (♀) as a function of age for different myocardial perfusion imaging tracers and protocols. Using Tc-99m instead of 201TI SPECT decreases the radiation effective dose (arrows) and cancer risk by a factor of 2. Further reduction by a factor of 2 to 3 is achieved by using current PET tracers. Adapted with permission.131
