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MAGNETOMETER FOR BRAIN RESEARCH.

Type of article: Article

Summary

A FOUR CHANNEL DIFFERENTIAL SQUID MAGNETOMETER HAS BEEN PUT INTO OPERATION AT THE HELSINKI UNIVERSITY OF TECHNOLOGY IN FINLAND. REAL TIME DETECTION OF HUMAN BRAIN ACTIVITY IS POSSIBLE EITHER BY MEASURING THE ELECTRIC POTENTIAL ON THE SCALP OR THE MAGNETIC FIELD OUTSIDE THE HEAD. A SERIOUS DRAWBACK OF THE ELECTRIC TECHNIQUE IS POOR LOCALIZATION OF BRAIN EVENTS THAT ARE RESPONSIBLE FOR ELECTRIC CHANGES. MAGNETIC FIELD MEASUREMENTS ARE MORE SELECTIVE AND ALLOW LOCALIZATION OF BRAIN ACTIVITY WITH A SPATIAL PRECISION APPROACHING A MILLIMETER. SINCE THE AMPLITUDES OF TYPICAL BRAIN FIELDS ARE EXTREMELY LOW, SENSITIVE SQUID MAGNETOMETERS ARE REQUIRED. AT PRESENT, FIELD MAPS ARE PRODUCEDBY MOVING THE MAGNETOMETER SUCCESSIVELY TO DIFFERENT LOCATIONS. AS AN EXAMPLE: A MAGNETIC FIELD ISOCONTOUR OBTAINED 110 MILLISEC. AFTER AN AUDITORY STIMULUS IS GIVEN. J. V.

Details

  • Original title: MAGNETOMETER FOR BRAIN RESEARCH.
  • Record ID : 1985-0832
  • Languages: English
  • Source: Cryogenics - vol. 24 - n. 4
  • Publication date: 1984

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