Gamma camera
The key imaging unit in NM, as well as an integrated part of a SPECT scanner. The name relates to its ability to register gamma radiation, the most commonly used type of radioactivity in NM. In the gamma camera a sodium iodide (actually a type of salt) will give off a small light flash each time it is hit by radioactivity, thus converting radioactivity into light signals. The light signals are then transmitted to a computer that processes the light signals to make up a recognisable image.
GE Healthcare Glossary