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Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy
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Note: Unshielded bilateral magnetoencephalography system using two-dimensional gradiometers.

Yusuke Seki1, Akihiko Kandori, Kuniomi Ogata

  • 1Advanced Research Laboratory, Hitachi, Ltd., 2520 Akanuma, Hatoyama-machi, Hiki-gun, Saitama 350-0395, Japan.

The Review of Scientific Instruments
|October 5, 2010
PubMed
Summary
This summary is machine-generated.

A new magnetoencephalography (MEG) system allows bilateral brain activity measurement without a shielded room, reducing cost and size. This unshielded system successfully detected auditory-evoked fields in elderly subjects, paving the way for diagnosing brain dysfunction.

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Area of Science:

  • Biophysics
  • Neuroscience
  • Medical Imaging

Background:

  • Magnetoencephalography (MEG) offers high temporal resolution for noninvasive neuronal activity measurement.
  • Traditional MEG systems require magnetically shielded rooms, increasing cost and size.
  • Developing cost-effective and compact MEG systems is crucial for wider clinical adoption.

Purpose of the Study:

  • To develop a novel, unshielded bilateral magnetoencephalography (MEG) system.
  • To enable simultaneous measurement of bilateral MEG waveforms.
  • To reduce the cost and physical footprint of MEG systems.

Main Methods:

  • Designed an unshielded bilateral MEG system utilizing four 2D gradiometers and two symmetric cryostats.
  • Employed low-T(c) superconducting quantum interference devices (SQUIDs) and wire-wound pickup coils for magnetic-field gradient detection.
  • Developed a cryostat positioning system allowing for vertical, horizontal, and rotational symmetry.

Main Results:

  • Successfully measured bilateral auditory-evoked fields (AEF) in an unshielded hospital environment.
  • Detected both ipsilateral and contralateral N100m components in all 18 elderly subjects.
  • Identified ipsilateral P50m in 67% and contralateral P50m in 89% of subjects.

Conclusions:

  • The developed unshielded bilateral MEG system effectively detects MEG waveforms.
  • This technology can potentially aid in diagnosing brain dysfunction, including epilepsy, Alzheimer's disease, and Down syndrome.
  • The system's compact and cost-effective design facilitates broader application in clinical settings.