Zero- to low-field MRI with averaging of concomitant gradient fields

TitleZero- to low-field MRI with averaging of concomitant gradient fields
Publication TypeJournal Article
Year of Publication2005
AuthorsMeriles C.A, Sakellariou D., Trabesinger A.H, Demas V., Pines A
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue6
Pagination1840-1842
Date PublishedFeb 8
ISBN Number0027-8424
Accession NumberWOS:000227072900009
Keywordsselection
Abstract

Magnetic resonance imaging (MRI) encounters fundamental limits in circumstances in which the static magnetic field is not sufficiently strong to truncate unwanted, so-called concomitant components of the gradient field. This limitation affects the attainable optimal image fidelity and resolution most prominently in low-field imaging. in this article, we introduce the use of pulsed magnetic-field averaging toward relaxing these constraints. It is found that the image of an object can be retrieved by pulsed low fields in the presence of the full spatial variation of the imaging encoding gradient field even in the absence of the typical uniform high-field time-independent contribution. In addition, error-compensation schemes can be introduced through the application of symmetrized pulse sequences. Such schemes substantially mitigate artifacts related to evolution in strong magnetic-field gradients, magnetic fields that vary in direction and orientation, and imperfections of the applied field pulses.

URL<Go to ISI>://WOS:000227072900009
DOI10.1073/Pnas.0409115102
Short TitleZero- to low-field MRI with averaging of concomitant gradient fields
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