Bone imaging is a stuy to visually detect bone abnormalities. Such imaging studies include magnetic resonance imaging (MRI), X-ray computed tomography (CT) and especially nuclear medicine. In the latter case the patient is injected with a small amount of radioactive material such as 600 MBq of technetium-99m-MDP and then scanned with a gamma camera, a device sensitive to the radiation emitted by the injected material. In order to view small lesions (less than 1 cm) especially in the spine, single photon emission computed tomography (SPECT) imaging techique may be required. In the United States, most insurance companies require separate authorization for SPECT imaging.