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Related Experiment Videos

Emission tomography in dementia.

Sanjeet Pakrasi1, John T O'Brien

  • 1Institute for Health and Ageing, Wolfson Research Centre, Newcastle General Hospital, Newcastle upon Tyne, NE4 6BE, UK. sanjeet.pakrasi@ncl.ac.uk

Nuclear Medicine Communications
|February 22, 2005
PubMed
Summary

Emission tomography, including SPECT and PET scans, aids in diagnosing dementia types by revealing brain function changes. These imaging techniques help differentiate conditions like Alzheimer's, Lewy body dementia, vascular dementia, and frontotemporal dementia.

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Area of Science:

  • Neurology
  • Radiology
  • Neuroimaging

Background:

  • Dementia significantly impacts healthcare.
  • Emission tomography offers unique insights into brain function and neurochemistry.
  • It aids in assessing individuals with established dementia and those at risk.

Purpose of the Study:

  • Investigate functional and neurochemical changes in various dementia types using emission tomography.
  • Differentiate between Alzheimer's disease, dementia with Lewy bodies, vascular dementia, and frontotemporal dementia.
  • Explore the potential of advanced imaging ligands for future diagnostic applications.

Main Methods:

  • Utilizing single photon emission computed tomography (SPECT) and positron emission tomography (PET).
  • Analyzing perfusion and metabolism patterns specific to different dementia subtypes.

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  • Examining neurochemical changes, including dopaminergic markers and receptor function.

    • Main Results:

    • Alzheimer's disease shows temporoparietal hypoperfusion (SPECT) and hypometabolism (PET).
    • Dementia with Lewy bodies exhibits parietal/occipital deficits and dopaminergic transporter reductions.
    • Vascular dementia presents with asymmetric perfusion deficits (multi-infarct) or reduced perfusion (subcortical).
    • Fronto-temporal dementia is characterized by frontotemporal hypometabolism and hypoperfusion.

    Conclusions:

    • Emission tomography is crucial for the differential diagnosis of dementia.
    • Imaging can detect changes preceding clinical onset in at-risk individuals.
    • Future developments focus on ligands targeting specific pathologies like amyloid and tau.