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Magn Reson Imaging. 2014 Jan;32(1):54-9. doi: 10.1016/j.mri.2013.07.012. Epub 2013 Oct 15.

Current-density imaging using ultra-low-field MRI with adiabatic pulses.

Author information

  • 1Department of Biomedical Engineering and Computational Science, Aalto University School of Science, P.O. Box 12200, FI-00076 AALTO, Finland. Electronic address: jaakko.nieminen@aalto.fi.

Abstract

Magnetic resonance imaging (MRI) allows measurement of electric current density in an object. The measurement is based on observing how the magnetic field of the current density affects the associated spins. However, as high-field MRI is sensitive to static magnetic field variations of only the field component along the main field direction, object rotations are typically needed to image three-dimensional current densities. Ultra-low-field (ULF) MRI, on the other hand, with B0 on the order of 10-100 μT, allows novel MRI sequences. We present a rotation-free method for imaging static magnetic fields and current densities using ULF MRI. The method utilizes prepolarization pulses with adiabatic switch-off ramps. The technique is designed to reveal complete field and current-density information without the need to rotate the object. The method may find applications, e.g., in conductivity imaging. We present simulation results showing the feasibility of the sequence.

© 2013.

KEYWORDS:

Adiabaticity; Current-density imaging; Prepolarization; Rotation-free; Ultra-low-field MRI

PMID:
24139338
[PubMed - indexed for MEDLINE]
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