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Related Experiment Videos

SPECT in patients with cortical visual loss

I E Silverman1, S L Galetta, L G Gray

  • 1Department of Neurology, University of Pennsylvania, Philadelphia.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|September 1, 1993
PubMed
Summary

Single-photon emission computed tomography (SPECT) can detect altered cerebral blood flow in cortical visual impairment. This functional imaging technique reveals abnormalities even when magnetic resonance imaging (MRI) is normal.

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Area of Science:

  • Neuroimaging
  • Neurology
  • Radiology

Background:

  • Cortical visual impairment (CVI) can result from various neurological conditions.
  • Assessing cerebral blood flow changes is crucial for understanding CVI.
  • Magnetic resonance imaging (MRI) provides anatomical detail but may miss functional deficits.

Purpose of the Study:

  • To investigate changes in cerebral blood flow (CBF) in patients with CVI using SPECT.
  • To compare functional findings from SPECT with anatomical findings from MRI.
  • To evaluate the diagnostic utility of SPECT in CVI of diverse etiologies.

Main Methods:

  • Seven patients with CVI underwent single-photon emission computed tomography (SPECT) using 99mTc-hexamethylpropyleneamine oxime (HMPAO).
  • SPECT scans assessed regional cerebral blood flow (rCBF).

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  • SPECT findings were correlated with T2-weighted MRI scans.

    • Main Results:

    • SPECT revealed altered rCBF in appropriate visual pathway regions in six of seven patients, correlating with clinical visual field defects.
    • MRI scans were normal or showed smaller lesions than those detected by SPECT.
    • SPECT demonstrated functional abnormalities not evident on anatomical MRI.

    Conclusions:

    • SPECT with 99mTc-HMPAO is effective in detecting altered rCBF in CVI patients.
    • SPECT can identify functional deficits in CVI even when MRI is normal or nondiagnostic.
    • SPECT offers valuable insights into the pathophysiology of CVI across various causes.