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 conferencePaperpeer-review

3 Citations (Scopus)


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 languageEnglish
Number of pages2
Publication statusPublished - 1998
Externally publishedYes
EventProceedings of the 1998 2nd International Conference on Bioelectromagnetism - Melbourne, Australia
Duration: Feb 15 1998Feb 18 1998


OtherProceedings of the 1998 2nd International Conference on Bioelectromagnetism
CityMelbourne, Australia

ASJC Scopus subject areas

  • Engineering(all)


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