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. © 2008 American Institute of Physics.
CITATION STYLE
Seki, Y., Kandori, A., Kumagai, Y., Ohnuma, M., Ishiyama, A., Ishii, T., … Chiba, T. (2008). Unshielded fetal magnetocardiography system using two-dimensional gradiometers. Review of Scientific Instruments, 79(3). https://doi.org/10.1063/1.2897588
Mendeley helps you to discover research relevant for your work.