A vector fetal magnetocardiogram system with high sensitivity

Akihiko Kandori, Tsuyoshi Miyashita, Keiji Tsukada, Hitoshi Horigome, Mitsuhiro Asaka, Sadahiko Shigemitsu, Miho Takahashi, Yasushi Terada, Toshio Mitsui, Yoshihide Chiba

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The vector fetal magnetocardiogram (V-FMCG) system that measures the three orthogonal components of the magnetic field from a fetal heart has been developed to clearly observe fetal cardiac activity during pregnancy by using the superconducting quantum interference device. To detect a clear V-FMCG signal, the bottom of the cryostat was made of thin glass - fiber-reinforced plastic and the total length between the pickup coil to the outer surface is 12 mm. Because the cryostat bottom was made thinner, the area of the cryostat's top and bottom could be made smaller, thus a low evaporation loss (10 days) were obtained. The gantry was able to tilt the cryostat and the bed could move in three axis directions, which made it possible to easily locate the vector pickup coil at an optimum position to obtain the maximum magnetic field from a fetal heart. We obtained V-FMCGs from 21 normal fetuses with gestation periods of 27-38 weeks. Using these vector signals, the dipoles were estimated and the relationship between the strength of the dipole moments and the number of gestation weeks could be obtained. Thus, V-FMCG seems to represent a new noninvasive tool for clearly detecting the electrophysiological activity of a fetal heart.

Original languageEnglish
Pages (from-to)4702-4705
Number of pages4
JournalReview of Scientific Instruments
Volume70
Issue number12
Publication statusPublished - Dec 1999
Externally publishedYes

Fingerprint

Cryostats
cryostats
sensitivity
Pickups
coils
glass fiber reinforced plastics
Magnetic fields
Glass fiber reinforced plastics
gantry cranes
pregnancy
SQUIDs
sensors
fetuses
Dipole moment
magnetic fields
beds
Evaporation
dipole moments
evaporation
dipoles

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Instrumentation

Cite this

Kandori, A., Miyashita, T., Tsukada, K., Horigome, H., Asaka, M., Shigemitsu, S., ... Chiba, Y. (1999). A vector fetal magnetocardiogram system with high sensitivity. Review of Scientific Instruments, 70(12), 4702-4705.

A vector fetal magnetocardiogram system with high sensitivity. / Kandori, Akihiko; Miyashita, Tsuyoshi; Tsukada, Keiji; Horigome, Hitoshi; Asaka, Mitsuhiro; Shigemitsu, Sadahiko; Takahashi, Miho; Terada, Yasushi; Mitsui, Toshio; Chiba, Yoshihide.

In: Review of Scientific Instruments, Vol. 70, No. 12, 12.1999, p. 4702-4705.

Research output: Contribution to journalArticle

Kandori, A, Miyashita, T, Tsukada, K, Horigome, H, Asaka, M, Shigemitsu, S, Takahashi, M, Terada, Y, Mitsui, T & Chiba, Y 1999, 'A vector fetal magnetocardiogram system with high sensitivity', Review of Scientific Instruments, vol. 70, no. 12, pp. 4702-4705.
Kandori A, Miyashita T, Tsukada K, Horigome H, Asaka M, Shigemitsu S et al. A vector fetal magnetocardiogram system with high sensitivity. Review of Scientific Instruments. 1999 Dec;70(12):4702-4705.
Kandori, Akihiko ; Miyashita, Tsuyoshi ; Tsukada, Keiji ; Horigome, Hitoshi ; Asaka, Mitsuhiro ; Shigemitsu, Sadahiko ; Takahashi, Miho ; Terada, Yasushi ; Mitsui, Toshio ; Chiba, Yoshihide. / A vector fetal magnetocardiogram system with high sensitivity. In: Review of Scientific Instruments. 1999 ; Vol. 70, No. 12. pp. 4702-4705.
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