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Evaluation of ictal brain SPET using statistical parametric mapping in temporal lobe epilepsy
1Department of Diagnostic Radiology, Yonsei University Medical College, Seoul, Korea.
European Journal of Nuclear Medicine
|December 6, 2000
Summary
Statistical Parametric Mapping (SPM) analysis of ictal brain single-photon emission tomography (SPET) effectively lateralizes the seizure focus in temporal lobe epilepsy (TLE). This method offers a diagnostic alternative, potentially reducing the need for interictal SPET and lowering medical costs.
Area of Science:
- Neuroscience
- Radiology
- Medical Imaging Analysis
Background:
- Statistical Parametric Mapping (SPM) is a standard for analyzing functional neuroimaging data.
- Its utility in improving diagnostic yield for ictal brain single-photon emission tomography (SPET) in temporal lobe epilepsy (TLE) requires investigation.
Purpose of the Study:
- To evaluate if SPM enhances the diagnostic accuracy of ictal SPET for localizing seizure foci in TLE patients.
- To compare SPM analysis with conventional subtraction methods.
Main Methods:
- Utilized SPM96 software to analyze ictal and interictal brain SPET data from 21 TLE patients and 9 controls.
- Compared SPM results (at various thresholds) with a conventional ictal-interictal subtraction method.
Main Results:
- SPM correctly lateralized the epileptogenic temporal lobe in 18 out of 21 patients when compared to a normal control group (P<0.05).
- Higher SPM thresholds (P<0.005, P<0.001) achieved correct lateralization in 15 and 13 patients, respectively, versus the normal group.
- The subtraction method showed comparable results to SPM only when comparing individual ictal images to the normal control group, not the interictal group.
Conclusions:
- SPM serves as a viable alternative for localizing seizure foci in TLE using ictal SPET.
- Establishing a normal brain SPET database could allow omission of interictal SPET, potentially reducing healthcare costs.