Magnetoencephalogram systems developed at KIT

Author

Kado, H. ; Higuchi, M. ; Shimogawara, M. ; Haruta, Y. ; Adachi, Y. ; Kawai, J. ; Ogata, H. ; Uehara, G.

Author_Institution

Kanazawa Inst. of Technol., Ishikawa, Japan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

4057

Lastpage

4062

Abstract

We have developed new systems for magnetoencephalography (MEG). The pick up coil is a coaxial type first-order gradiometer with 50-mm base line. The magnetic field resolution of the system is about 4 fT/Hz/sup 0.5/ or 0.8 (fT/cm)/Hz/sup 0.5/ in white noise region. The unique feature of the system is the gantry-free horizontal dewar, which is fabricated through what we call "ship-in-a-bottle approach". Less than 10-liter/day liquid helium consumption for the 100-liter capacity is realized. One of the merits of the horizontal dewar is that a small room is sufficient for installation because of the low height (0.89 m) of the dewar. Another merit is that the patient can be measured in lying position which is more relaxing compared to the conventional vertical type.

Keywords

SQUID magnetometers; biomedical equipment; magnetoencephalography; superconducting device noise; white noise; SQUID sensor arrays; alignment; calibration; coaxial type first-order gradiometer; external feedback coil configuration; flux trapping; gantry-free horizontal dewar; low dewar height; magnetic field resolution; magnetoencephalogram systems; operator friendliness; patient friendliness; pick up coil; reduced crosstalk; sensitivity; ship-in-a-bottle approach; white noise region; Coaxial components; Coils; Magnetic field measurement; Magnetic sensors; Position measurement; SQUIDs; Sensor arrays; Sensor systems; Signal processing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783918

Filename

783918