Abstract #0983
Mechanisms of SNR Enhancement and Line Shape Improvement in B 0 Correction for Overdiscrete MRSI Reconstruction
Thomas Kirchner 1 , Ariane Fillmer 1 , Klaas Paul Pruessmann 1 , and Anke Henning 1,2
1
Institute for Biomedical Engineering, UZH
and ETH Zurich, Zurich, Switzerland,
2
Max
Planck Institute for Biological Cybernetics, Tuebingen,
Germany
Spatial variations in the main magnetic field are a
common source of artifacts in brain MRSI. When using
overdiscrete target-driven reconstruction of
1
H
FID MRSI at 7T, improvements not only in spectral SNR
but also in metabolite line width are achieved by
performing B
0
correction
at a subvoxel level. The mechanisms behind these effects
are spatial noise decorrelation and frequency alignment.
Additional optimization of the FID acquisition time in
conjunction with zero-filling is shown to be largely
complementary and allows to further increase SNR
enhancement.
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