Cumulative radiation exposure poses hidden risk for older adults in research studies, new study warns

A new study highlights a critical gap: most clinical research studies that use imaging techniques such as amyloid positron emission tomography (PET) scans do not account for the radiation participants have already received from prior medical procedures. As brain imaging technology becomes more widely used in medical research—especially following recent U.S. Food and Drug Administration approvals of new Alzheimer's treatments—questions are emerging about how much radiation research participants are accumulating over a lifetime of medical scans.