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Functional mapping of the sensorimotor cortex: combined use of magnetoencephalography, functional MRI, and motor evoked potentials

  • Diagnostic Neuroradiology
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Abstract

Combined use of magnetoencephalography (MEG), functional magnetic resonance imaging (f-MRI), and motor evoked potentials (MEPs) was carried out on one patient in an attempt to localise precisely a structural lesion to the central sulcus. A small cyst in the right frontoparietal region was thought to be the cause of generalised seizures in an otherwise asymptomatic woman. First the primary sensory cortex was identified with magnetic source imaging (MSI) of somatosensory evoked magnetic fields using MEG and MRI. Second, the motor area of the hand was identified using f-MRI during handsqueezing. Then transcranial magnetic stimulation localised the hand motor area on the scalp, which was mapped onto the MRI. There was a good agreement between MSI, f-MRI and MEP as to the location of the sensorimotor cortex and its relationship to the lesion. Multimodality mapping techniques may thus prove useful in the precise localisation of cortical lesions, and in the preoperative determination of the best treatment for peri-rolandic lesions.

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Authors and Affiliations

  1. Department of Neurosurgery, Neurological Institute Faculty of Medicine, Kyushu University 60, 3-1-1 Maidashi, Higashi-ku, 812-82, Fukuoka, Japan

    T. Morioka, K. Fujii & M. Fukui

  2. Department of Radiology, Faculty of Medicine, Kyushu University, Fukuoka, Japan

    A. Mizushima, S. Matsumoto & K. Hasuo

  3. Department of Otolaryngology, Faculty of Medicine, Kyushu University, Fukuoka, Japan

    T. Yamamoto

  4. Department of Clinical Neurophysiology, Neurological Institute, Faculty of Medicine, Kyushu University, Fukuoka, Japan

    S. Tobimatsu

Authors
  1. T. Morioka
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  2. A. Mizushima
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  3. T. Yamamoto
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  4. S. Tobimatsu
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  5. S. Matsumoto
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  6. K. Hasuo
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  7. K. Fujii
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  8. M. Fukui
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Morioka, T., Mizushima, A., Yamamoto, T. et al. Functional mapping of the sensorimotor cortex: combined use of magnetoencephalography, functional MRI, and motor evoked potentials. Neuroradiology 37, 526–530 (1995). https://doi.org/10.1007/BF00593709

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  • DOI: https://doi.org/10.1007/BF00593709

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