Cyclotron

... electromagnetic radiation is transmitted at a first frequency substantially parallel to an earth's magnetic field line to excite electron cyclotron resonance heating in normally occurring plasma at an altitude of at least about 250 kilometers to generate a mirror force which lifts said ...

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... such as 11C (~20 min), 13N (~10 min), 15O (~2 min), and 18F (~110 min). Due to their short half lives, the radionuclides must be produced in a cyclotron at or near the site of the PET scanner. These radionuclides are incorporated into compounds normally used by the body such as glucose, water ...

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