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Single photon emission computed tomography

B P Mullan1, M K O'Connor, J C Hung

  • 1Department of Radiology, Mayo Medical School, Rochester, Minnesota, USA.

Neuroimaging Clinics of North America
|November 1, 1995
PubMed
Summary
This summary is machine-generated.

Single-photon emission computed tomography (SPECT) accurately pinpoints seizure focus in epilepsy. Ictal and peri-ictal SPECT imaging offers high sensitivity for temporal lobe epilepsy localization, guiding surgical decisions.

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Area of Science:

  • Neurology
  • Medical Imaging
  • Epileptology

Background:

  • Single-photon emission computed tomography (SPECT) is an established functional imaging technique for epilepsy.
  • It aids in the noninvasive localization of the seizure focus, crucial for surgical intervention in refractory epilepsy.
  • Electroencephalography with video monitoring is a precursor to more invasive evaluations like electrode placement.

Purpose of the Study:

  • To evaluate the sensitivity and accuracy of different SPECT imaging phases (ictal, peri-ictal, postictal, interictal) in localizing the seizure focus in temporal lobe epilepsy (TLE).
  • To explore the potential of novel neuroreceptor SPECT agents for seizure focus localization and understanding epilepsy mechanisms.

Main Methods:

  • Analysis of ictal, peri-ictal, postictal, and interictal SPECT scans in patients with temporal lobe epilepsy.
  • Comparison of SPECT findings with positron emission tomography (PET) studies.
  • Investigation of new iodinated neuroreceptor SPECT imaging agents.

Main Results:

  • Ictal SPECT shows transient hyperemia in anterior temporal lobe structures in TLE.
  • Peri-ictal SPECT reveals mesial temporal hyperperfusion followed by lateral hypoperfusion.
  • Interictal SPECT demonstrates ipsilateral hypoperfusion but with reduced sensitivity and accuracy compared to ictal and peri-ictal SPECT.
  • Ictal, peri-ictal, and postictal SPECT are highly sensitive and accurate for TLE localization.

Conclusions:

  • Ictal and peri-ictal SPECT imaging are highly sensitive and accurate for localizing the seizure focus in temporal lobe epilepsy.
  • Interictal SPECT is less sensitive and accurate for seizure focus localization.
  • New neuroreceptor SPECT agents show promise for non-invasive seizure focus localization and elucidating epilepsy mechanisms.