intravenously of a certain quantity of radiolabels or metabolic radio compounds: positron emission tomography uses a substance normally present in the organism (for example, glucose) labeled with a radioactive molecule (such as fluorine 18 in the case of glucose). Once in circulation, the radioactive tracer emits particular particles, called positrons, which are captured by a scanner (tomograph). The image returned by this equipment allows to evaluate how these tracers are distributed inside an organ or a certain biological tissue.
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, ultrasound and computed tomography, nuclear medicine diagnostic techniques - including PET - are not limited to morphological information, but represent the biochemical and physiological functions of the organ under examination.
In the field of nuclear medicine, planar examinations (scintigraphies) and tomoscintigraphic examinations (SPET) also include; PET allows the carrying out of segmental and total body tomographic examinations.
