Unshielded fetal magnetocardiography system using two-dimensional gradiometers.

Area of Science:

• Biomedical Engineering
• Medical Physics
• Cardiology

Background:

• Fetal heart activity monitoring is crucial for prenatal diagnostics.
• Existing fetal magnetocardiography (fMCG) systems face challenges with signal-to-noise ratio and environmental interference.
• Superconducting Quantum Interference Devices (SQUIDs) offer high magnetic field sensitivity.

Purpose of the Study:

• To develop and evaluate a novel fetal magnetocardiography (fMCG) system.
• To enhance signal-to-noise ratio for clearer fetal cardiac signal detection.
• To enable real-time fetal heart rate monitoring and arrhythmia diagnosis.

Main Methods:

• Development of a fetal magnetocardiography system utilizing a pair of two-dimensional gradiometers.
• The gradiometers are based on low-transition-temperature (low-Tc) superconducting quantum interference devices (SQUIDs).
• The system allows for adjustable gradiometer positioning via gantry-controlled cryostat movement in swinging and axial directions.

Main Results:

• Successful real-time measurement of a fetal magnetocardiography (fMCG) waveform at 25 weeks' gestation in an unshielded environment.
• Obtained averaged P and T waves from fetal magnetocardiography (fMCG) signals at 25 and 34 weeks' gestation, respectively.
• Demonstrated high signal-to-noise ratio achievable with the developed two-dimensional gradiometer system.

Conclusions:

• The developed two-dimensional gradiometer system represents a significant advancement in fetal magnetocardiography (fMCG).
• This technology shows great promise for accurate fetal heart rate measurement.
• The system is a viable tool for diagnosing fetal arrhythmia in clinical settings.