How Does a PET Scan Work?

How Does a PET Scan Work?
60 Seconds of Science explains what is happening in the
body when it undergoes an PET scan.

A PET scan uses radioactive tracers to create 3D images of the body.
The radiation from the tracers poses little danger to the patient since
they quickly pass out of the body. The kind of tracer used will depend
on what the doctor is looking for. Often when looking for cancer,
doctors use FDG, a modified form of glucose. The isotope attached
to the carrier molecule produces small particles called positrons,
which interact with surrounding electrons. The resulting release of
photons is detected by the PET scanner and translated into an image
through computer processing.

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