Diagnostic Test
Tomography, Emission-Computed, Single-Photon
Diagnostics
Overview
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.
This information is general and should not be treated as medical advice. Always speak directly with a qualified healthcare professional before making decisions about treatment, diagnosis, procedures, medicines or care.
Quick facts about Tomography, Emission-Computed, Single-Photon
- Topic type
- Diagnostic Test
- Category
- Diagnostics
- MeSH classification
- E01.370.350.350.800.800|E01.370.350.600.350.800.800|E01.370.350.710.800.800|E01.370.350.825.800.800|E01.370.384.730.800.800
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Source: Medical Subject Headings (MeSH), produced by the U.S. National Library of Medicine. EuroCareFinder is not endorsed by the National Library of Medicine. MeSH version: 2026.