What happens during a PET scan?
Positron emission tomography () is an examination that creates several cross-sectional images of the body or of a particular part of the body. These images are displayed layer by layer in thin slices. uses a radioactive substance that is not considered harmful for humans at the dosage given in this examination. The most commonly used substance is called fluorodeoxyglucose (FDG). The average radiation exposure is about the same as the exposure from a of the chest.
Radioactive means that the chemical decays without outside influence. In the process of decaying, it gives off radioactivity. This activity is harnessed to produce images. A scanner can precisely trace this substance’s path through the body and measure the radiation emitted by the body. These results are then used to create the different cross-sectional images. A computer can produce a spatial (3-dimensional, 3-D) image from these cross-sections.