Multichannel SQUID system detecting tangential components of the cardiac magnetic field

Keiji Tsukada; Yasuhiro Haruta; Akira Adachi; Hisanao Ogata; Takanori Komuro; Tsuyoshi Ito; Youichi Takada; Akihiko Kandori; Yasunaga Noda; Yasushi Terada; Toshio Mitsui

doi:10.1063/1.1146524

Multichannel SQUID system detecting tangential components of the cardiac magnetic field

Keiji Tsukada, Yasuhiro Haruta, Akira Adachi, Hisanao Ogata, Takanori Komuro, Tsuyoshi Ito, Youichi Takada, Akihiko Kandori, Yasunaga Noda, Yasushi Terada, Toshio Mitsui

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

The 32-channel SQUID system described here is used for diagnosing heart disease by measuring the x and y components of the cardiac magnetic field. To detect a magnetic field parallel to the body surface, it uses a compact hybrid superconducting quantum interference device (SQUID) gradiometer consisting of a planar pickup coil (fabricated using thin-film techniques) and a square double-washer dc-SQUID having large voltage-flux transfer function. The SQUIDs are operated in a flux-locked mode using simple readout circuits connected directly to the preamplifier without additional positive feedback. The system is installed in a magnetically shielded room in a hospital. A low noise characteristics lower than 10 ft/√Hz in a white noise is obtained in the hospital. Examples of tangential magnetocardiogram (MCG) measurements presented here show that the MCG obtained using this gradiometer makes it easy to visually estimate the electrophysiological behavior of the heart.

Original language	English
Pages (from-to)	5085-5091
Number of pages	7
Journal	Review of Scientific Instruments
Volume	66
Issue number	10
DOIs	https://doi.org/10.1063/1.1146524
Publication status	Published - 1995
Externally published	Yes

ASJC Scopus subject areas

Instrumentation

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10.1063/1.1146524

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title = "Multichannel SQUID system detecting tangential components of the cardiac magnetic field",

abstract = "The 32-channel SQUID system described here is used for diagnosing heart disease by measuring the x and y components of the cardiac magnetic field. To detect a magnetic field parallel to the body surface, it uses a compact hybrid superconducting quantum interference device (SQUID) gradiometer consisting of a planar pickup coil (fabricated using thin-film techniques) and a square double-washer dc-SQUID having large voltage-flux transfer function. The SQUIDs are operated in a flux-locked mode using simple readout circuits connected directly to the preamplifier without additional positive feedback. The system is installed in a magnetically shielded room in a hospital. A low noise characteristics lower than 10 ft/√Hz in a white noise is obtained in the hospital. Examples of tangential magnetocardiogram (MCG) measurements presented here show that the MCG obtained using this gradiometer makes it easy to visually estimate the electrophysiological behavior of the heart.",

author = "Keiji Tsukada and Yasuhiro Haruta and Akira Adachi and Hisanao Ogata and Takanori Komuro and Tsuyoshi Ito and Youichi Takada and Akihiko Kandori and Yasunaga Noda and Yasushi Terada and Toshio Mitsui",

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doi = "10.1063/1.1146524",

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T1 - Multichannel SQUID system detecting tangential components of the cardiac magnetic field

AU - Tsukada, Keiji

AU - Haruta, Yasuhiro

AU - Adachi, Akira

AU - Ogata, Hisanao

AU - Komuro, Takanori

AU - Ito, Tsuyoshi

AU - Takada, Youichi

AU - Kandori, Akihiko

AU - Noda, Yasunaga

AU - Terada, Yasushi

AU - Mitsui, Toshio

PY - 1995

Y1 - 1995

N2 - The 32-channel SQUID system described here is used for diagnosing heart disease by measuring the x and y components of the cardiac magnetic field. To detect a magnetic field parallel to the body surface, it uses a compact hybrid superconducting quantum interference device (SQUID) gradiometer consisting of a planar pickup coil (fabricated using thin-film techniques) and a square double-washer dc-SQUID having large voltage-flux transfer function. The SQUIDs are operated in a flux-locked mode using simple readout circuits connected directly to the preamplifier without additional positive feedback. The system is installed in a magnetically shielded room in a hospital. A low noise characteristics lower than 10 ft/√Hz in a white noise is obtained in the hospital. Examples of tangential magnetocardiogram (MCG) measurements presented here show that the MCG obtained using this gradiometer makes it easy to visually estimate the electrophysiological behavior of the heart.

AB - The 32-channel SQUID system described here is used for diagnosing heart disease by measuring the x and y components of the cardiac magnetic field. To detect a magnetic field parallel to the body surface, it uses a compact hybrid superconducting quantum interference device (SQUID) gradiometer consisting of a planar pickup coil (fabricated using thin-film techniques) and a square double-washer dc-SQUID having large voltage-flux transfer function. The SQUIDs are operated in a flux-locked mode using simple readout circuits connected directly to the preamplifier without additional positive feedback. The system is installed in a magnetically shielded room in a hospital. A low noise characteristics lower than 10 ft/√Hz in a white noise is obtained in the hospital. Examples of tangential magnetocardiogram (MCG) measurements presented here show that the MCG obtained using this gradiometer makes it easy to visually estimate the electrophysiological behavior of the heart.

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JF - Review of Scientific Instruments

IS - 10

ER -

Multichannel SQUID system detecting tangential components of the cardiac magnetic field

Abstract

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