Why the study?
Does an unshielded fetal magnetocardiography system using two-dimensional gradiometers allow for the measurement of fetal cardiac waveforms?
Does an unshielded fetal magnetocardiography system using two-dimensional gradiometers allow for the measurement of fetal cardiac waveforms?
The developed two-dimensional gradiometer fMCG system can measure fetal cardiac waveforms in an unshielded environment, offering a promising technique for diagnosing fetal arrhythmia.
May enable unshielded fMCG; leaves open validation for fetal arrhythmia diagnosis.
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.
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Seki et al. (2008) studied this question.
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