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CT, MR and SPECT imaging in temporal lobe epilepsy
R Duncan1, J Patterson, D M Hadley
1Institute of Neurological Sciences, Southern General Hospital, Glasgow, Scotland.
Journal of Neurology, Neurosurgery, and Psychiatry
|January 1, 1990
Summary
Low-field magnetic resonance imaging (MRI) better detects subtle temporal lobe lesions than computed tomography (CT) in epilepsy patients. Single photon emission computed tomography (SPECT) aids in identifying epileptic focus origins, potentially improving surgical selection.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Intractable temporal lobe epilepsy presents diagnostic challenges.
- Accurate localization of epileptic foci is crucial for surgical planning.
Purpose of the Study:
- To compare the efficacy of cranial computed tomography (CT), low-field magnetic resonance imaging (MRI), and single photon emission computed tomography (SPECT) in evaluating patients with intractable temporal lobe epilepsy.
- To assess the diagnostic yield of each imaging modality for detecting lateralizing abnormalities and specific lesions.
Main Methods:
- Thirty patients with intractable temporal lobe epilepsy underwent cranial CT (modified temporal lobe technique), 0.15T MRI, and SPECT.
- Abnormalities and lesions were analyzed for lateralization and specific characteristics.
Main Results:
- Overall, 21/30 patients showed lateralizing abnormalities.
- MRI detected specific lesions in seven patients, superior to CT (one patient).
- SPECT identified lateralizing abnormalities in 19 patients, suggesting its utility in functional localization.
Conclusions:
- Low-field MRI is more effective than modified CT for identifying subtle temporal lobe structural lesions.
- SPECT provides valuable functional information, supporting the origin of epileptic foci and potentially enhancing patient selection for epilepsy surgery.