- 著者
- Seki Yusuke Kandori Akihiko Kumagai Yukio Ohnuma Mitsuru Ishiyama Akihiko Ishii Tetsuko Nakamura Yoshiyuki Horigome Hitoshi Chiba Toshio
- 出版者
- American Institute of Physics
- 雑誌
- Review of scientific instruments (ISSN:00346748)
- 巻号頁・発行日
- vol.79, no.3, pp.036106, 2008-03
- 被引用文献数
- 11 14
We developed a fetal magnetocardiography (fMCG) system that uses a pair of two-dimensional gradiometers to achieve high signal-to-noise ratio. The gradiometer, which is based on a low-Tc superconducting quantum interference device, detects the gradient of a magnetic field in two orthogonal directions. Gradiometer position is easy to adjust by operating the gantry to drive the cryostat in both the swinging and axial directions. As a result, a fMCG waveform for 25 weeks' gestation was measured under an unshielded environment in real time. Moreover, the P and T waves for 25 and 34 weeks' gestation, respectively, were obtained by averaging. These results indicate that this two-dimensional gradiometer is one of the most promising techniques for measuring fetal heart rate and diagnosing fetal arrhythmia.