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B ~0~ mapping with multi‐channel RF coils at high field by Simon Robinson; Jorge Jovicich is a Medicine article available to read on EtoBox.

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## Abstract Mapping the static magnetic field via the phase evolution over gradient echo scans acquired at two or more echo times is an established method. A number of possibilities exist, however, for combining phase data from multi‐channel coils, denoising and thresholding field maps for high field applications. Three methods for combining phase images when no body/volume coil is available are tested: (i) Hermitian product, (ii) phase‐matching over channels, and (iii) a new approach based on calculating separate field maps for each channel. The separate channel method is shown to yield field maps with higher signal‐to‐noise ratio than the Hermitian product and phase‐matching methods and fewer unwrapping errors at low signal‐to‐noise ratio. Separate channel combination also allows unreliable voxels to be identified via the standard deviation over channels, which is found to be the most effective means of denoising field maps. Tests were performed using multichannel coils with between 8 and 32 channels at 3 T, 4 T, and 7 T. For application in the correction of distortions in echo‐planar images, a formulation is proposed for reducing the local gradient of field maps to eliminate sig

Who reads B ~0~ mapping with multi‐channel RF coils at high field?

Author

Simon Robinson; Jorge Jovicich

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0740-3194)

Published

2011

Language

EN

Field

Medicine (Health Sciences)