Antimatter is used in medical imaging from "summary" of Antimatter by Frank Close
One of the surprising applications of antimatter is in the field of medical imaging. In positron emission tomography (PET), a common imaging technique used in hospitals, antimatter is employed to detect and visualize the presence of certain conditions within the body. PET scanners work by detecting gamma rays emitted by a positron-emitting radionuclide, which is introduced into the body through a process known as radiotracer administration. When a positron collides with an electron, the two particles annihilate each other, producing two gamma rays that are emitted in opposite directions. These gamma rays are then detected by the PET scanner...
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