Tomography, Emission-Computed, Single-Photon


CAT Scan, Single Photon Emission

CAT Scan, Single-Photon Emission

CT Scan, Single Photon Emission

CT Scan, Single-Photon Emission

Emission-Computed Tomography, Single-Photon

Radionuclide Tomography, Single Photon Emission Computed

Radionuclide Tomography, Single-Photon Emission-Computed


Single Photon Emission CT Scan

Single Photon Emission Computed Tomography

Single Photon Emission Computer Assisted Tomography

Single Photon Emission Computerized Tomography

Single-Photon Emission CT Scan

Single-Photon Emission Computer-Assisted Tomography

Single-Photon Emission Computerized Tomography

Single-Photon Emission-Computed Tomography

Tomography, Single-Photon Emission-Computed

Tomography, Single-Photon, Emission-Computed

A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image.