Demonstration of Unshielded Fetal Magnetocardiography System Using Two-Dimensional Gradiometers

被引：3

作者：

Seki, Yusuke ^{[1
]}

Kandori, Akihiko ^{[1
]}

Kumagai, Yukio ^{[2
]}

Ohnuma, Mitsuru ^{[3
]}

Ishiyama, Akihiko

Ishii, Tetsuko

Nakamura, Yoshiyuki

Horigome, Hitoshi ^{[4
]}

Chiba, Toshio

机构：

[1] Hitachi Ltd, Adv Res Lab, Kokubunji, Tokyo 1858601, Japan

[2] Hitachi Ltd, Cent Res Lab, Kokubunji, Tokyo 1858601, Japan

[3] Hitachi Ltd, Design Div, Kokubunji, Tokyo 1858601, Japan

[4] Univ Tsukuba, Dept Pediat, Tsukuba, Ibaraki 305, Japan

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2009年 / 19卷 / 03期

关键词：

Biomagnetics; biomedical equipment; magnetocardiography; SQUIDs; LONG QT SYNDROME; PRENATAL-DIAGNOSIS;

D O I：

10.1109/TASC.2009.2019032

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We performed fetal magnetocardiography (fMCG) measurements in an unshielded hospital environment to demonstrate our developed fMCG system using two-dimensional (2D) gradiometers based on low-superconducting quantum interference devices. The subjects were 25 pregnant women, including two subjects with twin pregnancies, or 27 fetuses, in this study. The 2D gradiometer was optimized for fMCG measurements and detected both the axial second-order gradient and planar-first-order gradient of a magnetic field. Depth of the fetal heart was also measured by using ultrasonography before fMCG measurement. As a result, the QRS peaks of the fMCG waveform were detected in real time for 15 cases including early fetal gestational periods as 24 and 25 weeks. Moreover, the P and T waves were also detected in some cases by averaging. These results demonstrate that the developed unshielded fMCG system can detect fMCG waveforms in an unshielded hospital environment.

引用

页码：857 / 860

页数：4

共 12 条

[1]

Hamada H, 1999, PRENATAL DIAG, V19, P677, DOI 10.1002/(SICI)1097-0223(199907)19:7<677::AID-PD597>3.0.CO

[2]

2-Z

[3] Sensitivity of foetal magnetocardiograms versus gestation week [J].

Kandori, A ;

Miyashita, T ;

Tsukada, K ;

Horigome, H ;

Asaka, M ;

Shigemitsu, S ;

Takahashi, MI ;

Terada, Y ;

Mitsui, T .

MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING, 1999, 37 (05) :545-548

[4] A vector fetal magnetocardiogram system with high sensitivity [J].

Kandori, A ;

Miyashita, T ;

Tsukada, K ;

Horigome, H ;

Asaka, M ;

Shigemitsu, S ;

Takahashi, M ;

Terada, Y ;

Mitsui, T ;

Chiba, Y .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1999, 70 (12) :4702-4705

[5] Usefulness of magnetocardiography for the investigation of fetal arrhythmias [J].

Menéndez, T ;

Achenbach, S ;

Beinder, E ;

Hofbeck, M ;

Klinghammer, L ;

Singer, H ;

Moshage, W ;

Daniel, WG .

AMERICAN JOURNAL OF CARDIOLOGY, 2001, 88 (03) :334-+

[6] Active shielding to reduce low frequency disturbances in direct current near biomagnetic measurements [J].

Platzek, D ;

Nowak, H ;

Giessler, F ;

Röther, J ;

Eiselt, M .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1999, 70 (05) :2465-2470

[7] BASIC MATHEMATICAL AND ELECTROMAGNETIC CONCEPTS OF THE BIOMAGNETIC INVERSE PROBLEM [J].

SARVAS, J .

PHYSICS IN MEDICINE AND BIOLOGY, 1987, 32 (01) :11-22

[8] Prenatal diagnosis of a long QT syndrome by fetal magnetocardiography in an unshielded bedside environment [J].

Schneider, U ;

Haueisen, J ;

Loeff, M ;

Bondarenko, N ;

Schleussner, E .

PRENATAL DIAGNOSIS, 2005, 25 (08) :704-708

[9] Open-type magnetocardiograph with cylindrical magnetic shield [J].

Seki, Y ;

Kandori, A ;

Suzuki, D ;

Ohnuma, M .

APPLIED PHYSICS LETTERS, 2005, 86 (24) :1-3

[10] Unshielded fetal magnetocardiography system using two-dimensional gradiometers [J].

Seki, Yusuke ;

Kandori, Akihiko ;

Kumagai, Yukio ;

Ohnuma, Mitsuru ;

Ishiyama, Akihiko ;

Ishii, Tetsuko ;

Nakamura, Yoshiyuki ;

Horigome, Hitoshi ;

Chiba, Toshio .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2008, 79 (03)

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