Single-photon emission computed tomography (SPECT, or less commonly, SPET) is a nuclear medicine tomographic imaging technique using gamma rays. It is very similar to conventional nuclear medicine planar imaging using a gamma camera (that is, scintigraphy). However, it is able to provide true 3D information.Emissions from the radionuclide indicate amounts of blood flow in the capillaries of the imaged regions. In the same way that a plain X-ray is a 2-dimensional (2-D) view of a 3-dimensional structure, the image obtained by a gamma camera is a 2-D view of 3-D distribution of a radionuclide.
Single-photon emission computed tomography is a nuclear medicine tomographic imaging technique using gamma rays. It is able to provide true 3D information which is typically presented as cross-sectional slices through the patient, but can be freely reformatted or manipulated as required.