著者

石川 登 賀戸 久

出版者

公益社団法人 応用物理学会

雑誌

応用物理 (ISSN:03698009)

巻号頁・発行日

vol.60, no.6, pp.591-595, 1991-06-10 (Released:2009-02-05)

参考文献数

3

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磁束感度が非常に高いSQUIDによる生体磁場計測は,非侵襲計測法として医療診断への応用が期待されている. SQUIDの動作原理と生体磁場計測にて問題となるノイズ対策を概説する.また,生体磁場計測のノイズ対策法である磁気シールドルームの遮蔽性能評価法ならびに将来の医療診断応用を想定した磁気シールドルームに関する研究状況を紹介する.

著者

鎌田 清孝 土井 俊哉 尾形 久直 賀戸 久 湯ノ口 万友 白樂 善則

出版者

公益社団法人 日本磁気学会

雑誌

日本応用磁気学会誌 (ISSN:02850192)

巻号頁・発行日

vol.24, no.4_2, pp.867-870, 2000 (Released:2007-02-26)

参考文献数

10

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Environmental magnetic noises change with time influence biomagnetic measurements. There are two types: artificial magnetic noises, and those caused by natural fields For example, the former are caused by the movement of objects composed of magnetic materials, such as cars or trains, elevators, and fan-pumps of air conditioners, on the other hand, the latter are caused by natural fields, such as volcanoes or solar wind. The magnitude of geomagnetism is about 10 -4 T, and that of movements of cars or trains, elevators, and fan-pumps of air conditioners are 10-6 ∼ 10 -10 T. By contrast, the magnitude of magnetoencephalogram or magnetocardiogram is 10-12 ∼ 10 -14 T. Although they are, very weak, environmental magnetic noises cannot be ignored we measured the temporal vertical component of geomagnetic changes with a SQUID (Superconducting Quantum Interference Device) magnetometer in the vicinity of the crater of the Mount Sakurajima volcano for about 40 days. taken, By comparing our data taken by SQUID with the data of by the magnetic observatory of the Japan Meteorological Agency, we confirmed that our data are convincing. The influence of magnetic fluctuation caused by volcanoes on biomagnetic measurement is also discussed.

著者

賀戸 久

出版者

The Society of Instrument and Control Engineers

雑誌

計測と制御 (ISSN:04534662)

巻号頁・発行日

vol.29, no.1, pp.18-23, 1990-01-10 (Released:2009-11-26)

参考文献数

7