Simultaneously detected biomagnetic signals and NMR

Area of Science:

• Biophysics
• Magnetic Resonance Imaging
• Biomagnetism

Background:

• Simultaneous acquisition of nuclear magnetic resonance (NMR) spectra and biomagnetic signals like magnetocardiography (MCG) and magnetomyography (MMG) is challenging.
• Ultra-low field NMR offers advantages in reduced susceptibility noise and enhanced spectral resolution.
• High temporal resolution is crucial for observing dynamic biological processes.

Purpose of the Study:

• To demonstrate a method for simultaneous 1H NMR spectroscopy and high temporal resolution biomagnetic signal (MCG, MMG) acquisition.
• To explore the potential of ultra-low field NMR for direct imaging of biological currents.
• To assess the feasibility of concurrent MR imaging and biomagnetic measurements.

Main Methods:

• Acquisition of 1H NMR spectra at measurement fields of 2-50 microTesla (corresponding proton Larmor frequencies of 80-2000 Hz).
• Simultaneous recording of magnetocardiogram (MCG) and magnetomyogram (MMG) signals with sub-millisecond temporal resolution.
• Comparison of simultaneous NMR and biomagnetic measurements with a current phantom.

Main Results:

• Successful simultaneous acquisition of NMR spectra and high temporal resolution biomagnetic signals.
• Demonstration of a method suitable for MR imaging with concurrent biomagnetic signal measurement.
• Observation of narrow line widths and reduced susceptibility noise at ultra-low fields.

Conclusions:

• The developed method enables sub-millisecond temporal resolution for combined NMR and biomagnetic measurements.
• Ultra-low field NMR shows potential for highly sensitive detection of biological currents.
• This technique may pave the way for direct magnetic resonance imaging of bioelectric currents.