NDLI: Development of a biomagnetic measurement system for brain research

Content Provider	IEEE Xplore Digital Library
Author	Ueda, M. Kandori, A. Ogata, H. Takada, Y. Komuro, T. Kazami, K. Ito, T. Kado, H.
Copyright Year	2002
Abstract	The tail of the dewar of the authors' system has a special shape that makes it possible to measure the brain activity of anyone lying on a bed regardless of head shape or size. It allows the parietal, one side of the temporal and the occipital regions to be measured simultaneously. In the system, 128 axial first-order gradiometers are mounted at intervals of about 26 mm. The diameter and baseline length of the pickup coil are 14 mm and 50 mm, respectively. The authors use square-shaped double-washer DC-SQUIDs with additional positive feedback to improve the flux resolution. System reliability is improved by hermetically sealing the SQUID in a ceramic package and including a heater resistor to eliminate trapped flux. To decrease the liquid helium evaporation rate, output cables are made with flexible printed circuits. The read-out electronics are based on the Direct Offset Integration Technique, which is a highly simplified feedback method. The white noise level measured in a magnetically shielded room is less than 10 fT//spl radic/Hz above 5 Hz. This system has successfully been applied to measuring auditory evoked fields.<>
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2465
Ending Page	2469
Page Count	5
File Size	565883
File Format	PDF
ISSN	10518223
Volume Number	5
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Biomagnetics Shape measurement Feedback Magnetic field measurement Noise measurement Integrated circuit measurements Tail Size measurement Brain Magnetic heads
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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