MeSH Browser

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

Allowable Qualifiers: adverse effects (AE)

classification (CL)

economics (EC)

ethics (ES)

history (HI)

instrumentation (IS)

methods (MT)

mortality (MO)

nursing (NU)

psychology (PX)

standards (ST)

statistics & numerical data (SN)

trends (TD)

veterinary (VE)

Diagnosis [E01]
- Diagnostic Techniques and Procedures [E01.370]
  - Diagnostic Imaging [E01.370.350]
    - Image Interpretation, Computer-Assisted [E01.370.350.350]
      - Tomography, Emission-Computed [E01.370.350.350.800]
        
        Positron-Emission Tomography [E01.370.350.350.800.700]
        
        Tomography, Emission-Computed, Single-Photon [E01.370.350.350.800.800]
        
        Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography [E01.370.350.350.800.800.500]
        
        Single Photon Emission Computed Tomography Computed Tomography [E01.370.350.350.800.800.750]

Diagnosis [E01]
- Diagnostic Techniques and Procedures [E01.370]
  - Diagnostic Imaging [E01.370.350]
    - Photography [E01.370.350.600]
      - Image Enhancement [E01.370.350.600.350]
        
        Tomography, Emission-Computed [E01.370.350.600.350.800]
        
        Positron-Emission Tomography [E01.370.350.600.350.800.399]
        
        Tomography, Emission-Computed, Single-Photon [E01.370.350.600.350.800.800]
        
        Single Photon Emission Computed Tomography Computed Tomography [E01.370.350.600.350.800.800.500]

Diagnosis [E01]
- Diagnostic Techniques and Procedures [E01.370]
  - Diagnostic Imaging [E01.370.350]
    - Radionuclide Imaging [E01.370.350.710]
      - Tomography, Emission-Computed [E01.370.350.710.800]
        
        Positron-Emission Tomography [E01.370.350.710.800.399]
        
        Tomography, Emission-Computed, Single-Photon [E01.370.350.710.800.800]
        
        Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography [E01.370.350.710.800.800.500]
        
        Single Photon Emission Computed Tomography Computed Tomography [E01.370.350.710.800.800.750]

Diagnosis [E01]
- Diagnostic Techniques and Procedures [E01.370]
  - Diagnostic Imaging [E01.370.350]
    - Tomography [E01.370.350.825]
      - Tomography, Emission-Computed [E01.370.350.825.800]
        
        Positron-Emission Tomography [E01.370.350.825.800.399]
        
        Tomography, Emission-Computed, Single-Photon [E01.370.350.825.800.800]
        
        Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography [E01.370.350.825.800.800.500]
        
        Single Photon Emission Computed Tomography Computed Tomography [E01.370.350.825.800.800.750]

Diagnosis [E01]
- Diagnostic Techniques and Procedures [E01.370]
  - Diagnostic Techniques, Radioisotope [E01.370.384]
    - Radionuclide Imaging [E01.370.384.730]
      - Tomography, Emission-Computed [E01.370.384.730.800]
        
        Positron-Emission Tomography [E01.370.384.730.800.399]
        
        Tomography, Emission-Computed, Single-Photon [E01.370.384.730.800.800]
        
        Cardiac-Gated Single-Photon Emission Computer-Assisted Tomography [E01.370.384.730.800.800.500]
        
        Single Photon Emission Computed Tomography Computed Tomography [E01.370.384.730.800.800.750]

Tomography, Emission-Computed, Single-Photon Preferred

Concept UI: M0024331
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.
Terms: Tomography, Emission-Computed, Single-Photon Preferred Term
Term UI T047128
Date01/01/1999
LexicalTag NON
ThesaurusID IOM (1990); CAT Scan, Single-Photon Emission
Term UI T704713
Date08/28/2007
LexicalTag ACX
ThesaurusID NLM (2009); CT Scan, Single-Photon Emission
Term UI T704712
Date08/28/2007
LexicalTag ACX
ThesaurusID NLM (2009); Radionuclide Tomography, Single-Photon Emission-Computed
Term UI T047124
Date04/13/1989
LexicalTag NON
ThesaurusID IOM (1990); Single-Photon Emission Computer-Assisted Tomography
Term UI T704831
Date08/29/2007
LexicalTag NON
ThesaurusID NLM (2009); Single-Photon Emission Computerized Tomography
Term UI T704830
Date08/29/2007
LexicalTag NON
ThesaurusID NLM (2009); Single-Photon Emission CT Scan
Term UI T704711
Date08/28/2007
LexicalTag NON
ThesaurusID NLM (2009); Single-Photon Emission-Computed Tomography
Term UI T047126
Date04/13/1989
LexicalTag NON
ThesaurusID IOM (1990); SPECT
Term UI T047125
Date04/13/1989
LexicalTag ABB
ThesaurusID IOM (1990); Tomography, Single-Photon, Emission-Computed
Term UI T047127
Date04/19/1989
LexicalTag NON
ThesaurusID IOM (1990)

Tomography, Emission-Computed, Single-Photon MeSH Descriptor Data 2025