Cortical Localization of Scalp Electrodes on Three-Dimensional Brain Surface Using Frameless Stereotactic Image Guidance System.
- Author:
Daeyoung KIM
1
;
Eun Yeon JOO
;
Woo Suk TAE
;
Sun Jung HAN
;
Jae Wook CHO
;
Dae Won SEO
;
Seung Bong HONG
Author Information
1. Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea. sbhong@smc.samsung.co.kr
- Publication Type:Original Article
- Keywords:
Frameless stereotaxy;
Scalp electrodes;
EEG;
MRI
- MeSH:
Brain*;
Electrodes*;
Electroencephalography;
Epilepsies, Partial;
Epilepsy;
Frontal Lobe;
Humans;
Individuality;
Magnetic Resonance Imaging;
Male;
Neuronavigation;
Parietal Lobe;
Scalp*
- From:Journal of the Korean Neurological Association
2007;25(2):155-160
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND: The purpose of this study was to localize the cortical regions reflected by overlying scalp electrodes. METHODS: We enrolled 10 patients with epilepsy (5 males, mean age 29.7 years old). Thin slice coronal T1 weighted MR images were obtained and then scalp EEG electrodes were placed based on an international 10-20 system. Cortical locations of scalp electrodes were determined using a real-time frameless stereotactic image guidance system, Brainsight(R). RESULTS: The locations of 19 scalp electrodes were marked on the 3D rendered cortical surface of one representative patient's MRI; Fp1 (Fp2) on the anterior pole of the middle frontal gyrus, Fz on the mid-point of the interhemispheric fissure in the frontal lobe, F3 (F4) on the mid-portion of the middle frontal gyrus, F7 (F8) on the pars triangularis of the inferior frontal gyrus, Cz on the interhemispheric fissure where a lateral precentral gyrus starts, C3 (C4) scattered around postcentral gyrus, T3 (T4) on the middle temporal gyrus, P3 (P4) on the angular gyrus, Pz on the mid-point of the interhemispheric fissure in the parietal lobe, T5 (T6) on the posterior part of the inferior temporal gyrus, and O1 (O2) on the occipital pole. CONCLUSIONS: The locations of scalp electrodes were well correlated with conventional concepts of their cortical locations. The individual differences of the scalp electrode locations may be due to the different sizes and morphologies of the brains in each of the patients. Real time cortical localization of scalp electrodes using the Frameless Stereotactic Image Guidance System may provide useful information for more accurate localization of focal cerebral activity in partial epilepsy patients.
