|Double-headed gamma camera|
This gamma camera is equipped with two heads capable of detecting the presence of radiation. The lower head is partly concealed under the bed, and the whole apparatus can be moved along horizontally to obtain a full-body scintigraphy. By doubling the number of gamma rays used, a face scintigraphy can be performed at the same time as a back scintigraphy for the same amount of radioisotope ingested. By comparison with a PET scanner, a gamma camera requires much less equipment and is more easy to set up. A large number of hospitals make use of them for this reason.