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Tomography, Emission-Computed, Single-Photon MeSH Descriptor Data 2022


MeSH Heading
Tomography, Emission-Computed, Single-Photon
Tree Number(s)
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
Unique ID
D015899
RDF Unique Identifier
http://id.nlm.nih.gov/mesh/D015899
Scope Note
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.
Entry Version
CT SINGLE PHOTON EMISS
Entry Term(s)
CAT Scan, Single-Photon Emission
CT Scan, Single-Photon Emission
Radionuclide Tomography, Single-Photon Emission-Computed
SPECT
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
NLM Classification #
WN 206
Previous Indexing
Tomography, Emission-Computed (1980-1989)
Tomography, X-Ray Computed (1977-1979)
Public MeSH Note
90; was SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY & SPECT see TOMOGRAPHY, EMISSION-COMPUTED 1989
Online Note
use TOMOGRAPHY, EMISSION-COMPUTED to search SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY & SPECT 1989
History Note
90; was SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY & SPECT see TOMOGRAPHY, EMISSION-COMPUTED 1989
Date Established
1990/01/01
Date of Entry
1989/05/16
Revision Date
2008/07/08
Tomography, Emission-Computed, Single-Photon Preferred
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