Sensitivity of foetal magnetocardiograms versus gestation week

A. Kandori, T. Miyashita, Keiji Tsukada, H. Horigome, M. Asaka, S. Shigemitsu, M. I. Takahashi, Y. Terada, T. Mitsui

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Foetal magnetocardiograms (FMCGs) were measured using a nine-channel SQUID system equipped with first-order gradiometers (60 mm baseline, 20 mm diameter). The system was installed in a magnetically shielded room in a hospital. The white noise level was less than 10 fT/√Hz, and FMCGs above 1 pT were detected. These results and the depth to the foetal heart were used to estimate the current dipole. The relationship between the current dipole (Q) and the gestation week (G) was calculated and the average performance was determined as Q = 18 G - 295. By using the estimated foetal current dipole, the measurement limit (average value) between depth and gestation weeks was determined. When the depth from the pickup coil to the foetal heart is 50, 60, 70 and 80 mm, the first detectable gestation weeks of FMCGs above 1 pT measured by a first-order gradiometer with 60 mm baseline were determined at 21, 23, 26, and 30 weeks respectively, and the detectable gestation weeks in the case of a 30 mm baseline were determined at 22, 26, 30 and 36 weeks respectively.

Original languageEnglish
Pages (from-to)545-548
Number of pages4
JournalMedical & Biological Engineering & Computing
Volume37
Issue number5
Publication statusPublished - 1999
Externally publishedYes

Fingerprint

Fetal Heart
Pregnancy
Pickups
SQUIDs
White noise

Keywords

  • Dipole estimation
  • FMCG
  • Magnetocardiogram
  • SQUID

ASJC Scopus subject areas

  • Biomedical Engineering
  • Health Informatics
  • Health Information Management
  • Computer Science Applications
  • Computational Theory and Mathematics

Cite this

Kandori, A., Miyashita, T., Tsukada, K., Horigome, H., Asaka, M., Shigemitsu, S., ... Mitsui, T. (1999). Sensitivity of foetal magnetocardiograms versus gestation week. Medical & Biological Engineering & Computing, 37(5), 545-548.

Sensitivity of foetal magnetocardiograms versus gestation week. / Kandori, A.; Miyashita, T.; Tsukada, Keiji; Horigome, H.; Asaka, M.; Shigemitsu, S.; Takahashi, M. I.; Terada, Y.; Mitsui, T.

In: Medical & Biological Engineering & Computing, Vol. 37, No. 5, 1999, p. 545-548.

Research output: Contribution to journalArticle

Kandori, A, Miyashita, T, Tsukada, K, Horigome, H, Asaka, M, Shigemitsu, S, Takahashi, MI, Terada, Y & Mitsui, T 1999, 'Sensitivity of foetal magnetocardiograms versus gestation week', Medical & Biological Engineering & Computing, vol. 37, no. 5, pp. 545-548.
Kandori A, Miyashita T, Tsukada K, Horigome H, Asaka M, Shigemitsu S et al. Sensitivity of foetal magnetocardiograms versus gestation week. Medical & Biological Engineering & Computing. 1999;37(5):545-548.
Kandori, A. ; Miyashita, T. ; Tsukada, Keiji ; Horigome, H. ; Asaka, M. ; Shigemitsu, S. ; Takahashi, M. I. ; Terada, Y. ; Mitsui, T. / Sensitivity of foetal magnetocardiograms versus gestation week. In: Medical & Biological Engineering & Computing. 1999 ; Vol. 37, No. 5. pp. 545-548.
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