Investigation of Magnetic Interference Induced via Gradient Field Coils for Ultra-Low-Field MRI Systems

We are developing a compact ultra-low-field MRI system that is composed of a SQUID gradiometer and a coil set that generates magnetic fields for capturing MR images. The magnetic interference induced from a power amplifier potentially disturbs MRI measurements. We investigated the path of the interf...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-01, Vol.507 (4), p.42030-4
Main Authors: Oyama, D, Hatta, J, Miyamoto, M, Adachi, Y, Higuchi, M, Kawai, J, Fujihira, J, Tsuyuguchi, N, Uehara, G
Format: Article
Language:English
Subjects:
Coiling
Field coils
Gradiometers
Homogeneity
Interference
Magnetic fields
Magnetic measurement
Magnetic measurements
Magnetic resonance imaging
Magnetism
Physics
Power amplifiers
SQUIDs
Superconducting quantum interference devices
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Summary:We are developing a compact ultra-low-field MRI system that is composed of a SQUID gradiometer and a coil set that generates magnetic fields for capturing MR images. The magnetic interference induced from a power amplifier potentially disturbs MRI measurements. We investigated the path of the interference by experimental measurements and calculation of the magnetic field generated by the coil set. We found that the magnetic field generated from a particular gradient coil affected the SQUID gradiometer and that the level of the interference was strongly dependent on the shape of the gradient coils. When the coils' shapes are designed, minimizing the noise introduced from the power amplifier is crucial, in addition to consideration of the homogeneities of the magnetic field.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/507/4/042030