Compact and easy-operation magnetocardiograph with four-channel planar gradiometers

K. Yokosawa, D. Suzuki, A. Tsukamoto, T. Miyashita, A. Kandori, K. Tsukada, K. Takagi

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)


A magnetocardiograph (MCG), which consists of a sensor comprising four superconducting-quantum-interference device (SQUID) gradiometers and a magnetic shielding cylinder made of nanocrystalline soft magnetic materials, has been developed. The sensor can be handled easily because the gradiometers are made of high-critical-temperature (Tc) superconductor operated in liquid nitrogen. Further, the shielding cylinder is lightweight (160 kg) and compact (2 m long and 1 m in diameter). The gradiometer balance is high enough (typically 0.1%) for recording magnetocardiograms inside the shielding cylinder, whose shielding factor is -35 dB at 1 Hz. We used the new MCG to record magnetocardiograms of a healthy volunteer at four different positions. From this magnetocardiograms we then obtained a current arrow map, by which mycardium activity can be estimated, at 16 sites (4 × 4 matrix) on the measurement plane. The similarity between the current-arrow map obtained by a conventional MCG and that from the newly developed MCG indicates that the developed compact MCG is also capable of estimating the region of cardiac activity.

Original languageEnglish
Pages (from-to)3281-3284
Number of pages4
JournalAnnual Reports of the Research Reactor Institute, Kyoto University
Publication statusPublished - Dec 1 2001
Externally publishedYes
Event23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Istanbul, Turkey
Duration: Oct 25 2001Oct 28 2001


  • High-Tc
  • Magnetocardiograph
  • Shielding

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Mechanical Engineering


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