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Magn Reson Med. 2011 Feb;65(2):544-50. doi: 10.1002/mrm.22632. Epub 2010 Sep 24.

Human imaging at 9.4 T using T(2) *-, phase-, and susceptibility-weighted contrast.

Author information

1
Max Planck Institute for Biological Cybernetics, Magnetic Resonance Center, Tübingen, Germany.

Abstract

The effect of susceptibility differences on an MR image is known to increase with field strength. Magnetic field inhomogeneities within the voxels influence the apparent transverse relaxation time T(2) *, while effects due to different precession frequencies between voxels caused by local field variations are evident in the image phase, and susceptibility-weighted imaging highlights the veins and deep brain structures. Here, these three contrast mechanisms are examined at a field strength of 9.4 T. The T(2) * maps generated allow the identification of white matter structures not visible in conventional images. Phase images with in-plane resolutions down to 130 μm were obtained, showing high gray/white matter contrast and allowing the identification of internal cortical structures. The susceptibility-weighted images yield excellent visibility of small venous structures and attain an in-plane resolution of 175 μm.

PMID:
20872858
DOI:
10.1002/mrm.22632
[Indexed for MEDLINE]
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