Mechanisms of SNR Enhancement and Line Shape Improvement in B0 Correction for 
Overdiscrete MRSI Reconstruction

Kirchner, T; Fillmer, A; Pruessmann, KP; Henning, A

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Mechanisms of SNR Enhancement and Line Shape Improvement in B0 Correction for Overdiscrete MRSI Reconstruction

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Henning, A
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

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http://www.ismrm.org/15/program_files/FriSci01.htm
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Citation

Kirchner, T., Fillmer, A., Pruessmann, K., & Henning, A. (2015). Mechanisms of SNR Enhancement and Line Shape Improvement in B0 Correction for Overdiscrete MRSI Reconstruction. In 23rd Annual Meeting and Exhibition of the International Society for Magnetic Resonance in Medicine (ISMRM 2015).

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-45C0-1

Abstract

Spatial variations in the main magnetic field are a common source of artifacts in brain MRSI. When using overdiscrete target-driven reconstruction of 1H FID MRSI at 7T, improvements not only in spectral SNR but also in metabolite line width are achieved by performing B0 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.