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Ictal single-photon emission computed tomography imaging in extra temporal lobe epilepsy using statistical parametric

Robert C Knowlton1, Nicholas D Lawn, James M Mountz

  • 1University of Alabama at Birmingham Epilepsy Center, Department of Neurology, School of Medicine, Birmingham, AL 35294, USA. knowlton@uab.edu

Journal of Neuroimaging : Official Journal of the American Society of Neuroimaging
|September 11, 2004
PubMed
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Statistical parametric mapping (SPM) accurately analyzes ictal single-photon emission computed tomography (SPECT) scans for extratemporal lobe epilepsy localization, aiding surgical candidates.

Area of Science:

  • Neuroimaging
  • Epileptology
  • Statistical Analysis

Background:

  • Extratemporal lobe epilepsy presents diagnostic challenges for surgical planning.
  • Accurate ictal localization is crucial for successful epilepsy surgery outcomes.

Purpose of the Study:

  • To evaluate the efficacy of statistical parametric mapping (SPM) for analyzing ictal single-photon emission computed tomography (SPECT) scans.
  • To assess SPM's utility in localizing seizure onset in patients with extratemporal lobe epilepsy considered for surgery.

Main Methods:

  • Patients with intractable partial epilepsy and successful ictal SPECT were selected.
  • Ictal SPECT scans were analyzed using SPM96, comparing voxel-wise blood flow increases to a normal SPECT atlas.
  • SPM results were compared with conventional visual interpretation and SISCOM (subtraction ictal SPECT co-registered to MRI).

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Main Results:

  • SPM correctly localized ictal hyperperfusion in 10 out of 13 patients, consistent with epilepsy localization.
  • SPM analysis demonstrated high concordance with surgical outcomes and other imaging methods.
  • Discrepancies were noted, with some cases localized by visual interpretation or SISCOM when SPM failed, and vice versa.

Conclusions:

  • Statistical parametric mapping (SPM) offers an objective and accurate method for analyzing ictal SPECT scans in extratemporal epilepsy.
  • SPM shows promise as a valuable tool in the presurgical evaluation of epilepsy patients.
  • Further validation and comparison with other techniques are supported by these findings.