PET scanning
Another recent technique is positron emission tomography, or PET
scanning, which involves the emission of particles of antimatter by compounds
injected into the body being scanned. These particles, positrons, are
neutralized by their opposites, electrons, and energy is released in the form
of radiation as matter and antimatter annihilate each other. Detectors arranged
around the body pick up the energy released and use it to follow the movements
of the injected compound and its metabolism.
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