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Motion artifact variability in biomagnetic wearable devices.

Negin Ghahremani Arekhloo1,2, Huxi Wang1,2, Hossein Parvizi2

  • 1Neuranics Limited, Glasgow, United Kingdom.

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|November 1, 2024
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Motion artifacts significantly impact biomagnetic measurements. This study shows gradient magnetic fields cause motion artifact variability, but gradiometers effectively reduce these artifacts in ambient environments.

Keywords:
biomagnetic measurementsgradient background fieldhomogeneous background fieldmotion artifactswearable sensors

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Area of Science:

  • Biomagnetism
  • Sensor Technology
  • Noise Reduction

Background:

  • Motion artifacts are a major noise source in biomagnetic measurements, often exceeding desired signal strength in ambient conditions.
  • Environmental factors, particularly magnetic fields, influence the magnitude and variability of motion artifacts.

Purpose of the Study:

  • To evaluate the variability of motion artifacts in ambient environments.
  • To assess the effectiveness of a gradiometer in mitigating motion artifacts.

Main Methods:

  • Measured single-channel sensor output under varying homogeneous and gradient magnetic field conditions.
  • Configured a gradiometer in parallel and vertical alignment to the direction of vibration (X-axis).
  • Analyzed the impact of gradient magnetic fields on sensor and gradiometer outputs.

Main Results:

  • Motion artifact variability is primarily driven by gradient magnetic fields, not homogeneous ones.
  • A gradiometer significantly reduced motion artifact output compared to a single-channel sensor in gradient fields (0.75 pT/mm vs. 164.97 pT/mm).
  • Gratiometer performance remained effective when repositioned perpendicular to vibration (1.06 pT/mm vs. 196.85 pT).

Conclusions:

  • Ambient environmental conditions, especially gradient magnetic fields, significantly influence motion artifacts.
  • Gradiometers show strong potential for mitigating motion artifacts in biomagnetic measurements.
  • Further research will compare gradiometer designs in shielded vs. unshielded environments.