Multichannel SQUID system for detecting fetal magnetocardiograms

Akihiko Kandori; Keiji Tsukada; Hitoshi Horigome; Mitsuhiro Asaka; Sadahiko Shigemitsu; Miho Takahashi; Yasushi Terada; Takeshi Kubo; Akira Matsui; Toshio Mitsui

Multichannel SQUID system for detecting fetal magnetocardiograms

Akihiko Kandori, Keiji Tsukada, Hitoshi Horigome, Mitsuhiro Asaka, Sadahiko Shigemitsu, Miho Takahashi, Yasushi Terada, Takeshi Kubo, Akira Matsui, Toshio Mitsui

Research output: Contribution to conference › Paper › peer-review

3 Citations (Scopus)

Abstract

A nine-channel SQUID magnetometer system is developed to detect weak magnetic fields generated by fetal cardiac activity. The nine 20-mm-diameter axial first-order gradiometers are mounted at intervals of 30 mm. A baseline length of 60 mm is applied to the pickup coil to measure the weak magnetic field from a fetal heart in a deep position. The SQUID is operated with a flux-locked loop (FLL) circuit and the FLL output is recorded at 1 kHz by a computer. Fetal magneto-cardiograms (FMCG) were measured for 109 fetuses of 20 to 39 weeks' gestation. In most cases, maternal MCG interference was negligible. R-wave peaks were detected in 81% of all subjects. The results of FMCG measurements and Fourier analysis of fetal the R-R interval are shown in this paper.

Original language	English
Pages	129-130
Number of pages	2
Publication status	Published - 1998
Externally published	Yes
Event	Proceedings of the 1998 2nd International Conference on Bioelectromagnetism - Melbourne, Australia Duration: Feb 15 1998 → Feb 18 1998

Other

Other	Proceedings of the 1998 2nd International Conference on Bioelectromagnetism
City	Melbourne, Australia
Period	2/15/98 → 2/18/98

ASJC Scopus subject areas

Engineering(all)

Cite this

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title = "Multichannel SQUID system for detecting fetal magnetocardiograms",

abstract = "A nine-channel SQUID magnetometer system is developed to detect weak magnetic fields generated by fetal cardiac activity. The nine 20-mm-diameter axial first-order gradiometers are mounted at intervals of 30 mm. A baseline length of 60 mm is applied to the pickup coil to measure the weak magnetic field from a fetal heart in a deep position. The SQUID is operated with a flux-locked loop (FLL) circuit and the FLL output is recorded at 1 kHz by a computer. Fetal magneto-cardiograms (FMCG) were measured for 109 fetuses of 20 to 39 weeks' gestation. In most cases, maternal MCG interference was negligible. R-wave peaks were detected in 81% of all subjects. The results of FMCG measurements and Fourier analysis of fetal the R-R interval are shown in this paper.",

author = "Akihiko Kandori and Keiji Tsukada and Hitoshi Horigome and Mitsuhiro Asaka and Sadahiko Shigemitsu and Miho Takahashi and Yasushi Terada and Takeshi Kubo and Akira Matsui and Toshio Mitsui",

note = "Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.; Proceedings of the 1998 2nd International Conference on Bioelectromagnetism ; Conference date: 15-02-1998 Through 18-02-1998",

year = "1998",

language = "English",

pages = "129--130",

}

TY - CONF

T1 - Multichannel SQUID system for detecting fetal magnetocardiograms

AU - Kandori, Akihiko

AU - Tsukada, Keiji

AU - Horigome, Hitoshi

AU - Asaka, Mitsuhiro

AU - Shigemitsu, Sadahiko

AU - Takahashi, Miho

AU - Terada, Yasushi

AU - Kubo, Takeshi

AU - Matsui, Akira

AU - Mitsui, Toshio

PY - 1998

Y1 - 1998

N2 - A nine-channel SQUID magnetometer system is developed to detect weak magnetic fields generated by fetal cardiac activity. The nine 20-mm-diameter axial first-order gradiometers are mounted at intervals of 30 mm. A baseline length of 60 mm is applied to the pickup coil to measure the weak magnetic field from a fetal heart in a deep position. The SQUID is operated with a flux-locked loop (FLL) circuit and the FLL output is recorded at 1 kHz by a computer. Fetal magneto-cardiograms (FMCG) were measured for 109 fetuses of 20 to 39 weeks' gestation. In most cases, maternal MCG interference was negligible. R-wave peaks were detected in 81% of all subjects. The results of FMCG measurements and Fourier analysis of fetal the R-R interval are shown in this paper.

AB - A nine-channel SQUID magnetometer system is developed to detect weak magnetic fields generated by fetal cardiac activity. The nine 20-mm-diameter axial first-order gradiometers are mounted at intervals of 30 mm. A baseline length of 60 mm is applied to the pickup coil to measure the weak magnetic field from a fetal heart in a deep position. The SQUID is operated with a flux-locked loop (FLL) circuit and the FLL output is recorded at 1 kHz by a computer. Fetal magneto-cardiograms (FMCG) were measured for 109 fetuses of 20 to 39 weeks' gestation. In most cases, maternal MCG interference was negligible. R-wave peaks were detected in 81% of all subjects. The results of FMCG measurements and Fourier analysis of fetal the R-R interval are shown in this paper.

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M3 - Paper

AN - SCOPUS:0031682798

SP - 129

EP - 130

T2 - Proceedings of the 1998 2nd International Conference on Bioelectromagnetism

Y2 - 15 February 1998 through 18 February 1998

ER -

Multichannel SQUID system for detecting fetal magnetocardiograms

Abstract

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