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DeCS
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Descriptor English:
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Tomography, Emission-Computed, Single-Photon
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Descriptor Spanish:
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Tomografía de Emisión Computarizada de Fotón Simple
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Descriptor Portuguese:
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Tomografia Computadorizada de Emissão de Fóton Único
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Synonyms English:
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Radionuclide Tomography, Single-Photon Emission-Computed
Single-Photon Emission-Computed Tomography
SPECT
Tomography, Single-Photon, Emission-Computed
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Tree Number:
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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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Definition English:
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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. |
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Indexing Annotation English:
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uses radionuclides & computer; do not use /util except by MeSH definition; DF: CT SINGLE PHOTON EMISS but note shorter X ref: SPECT
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History Note English:
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90; was SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY & SPECT see TOMOGRAPHY, EMISSION-COMPUTED 1989
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Allowable Qualifiers English:
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Record Number:
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24895
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Unique Identifier:
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D015899
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Occurrence in VHL:
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Similar:
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DeCS SciELO LILACS LIS
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