Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 180, Issue 2, Pages 286-296Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2006.03.007
Keywords
homogeneity; shimming; dynamic shimming; shim degeneracy
Funding
- NCI NIH HHS [R21 CA118503] Funding Source: Medline
- NIBIB NIH HHS [R01 EB000473] Funding Source: Medline
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Dynamic alteration of shim settings during a multi-slice imaging experiment can improve static magnetic-field homogeneity over extended volumes. In this report, a pre-emphasized dynamic shim updating (DSU) system capable of rapidly updating all non-degenerate zeroth through second-order shims is presented and applied to high-field multi-slice imaging studies on the human brain. DSU is utilized in both non-oblique and oblique slicing geometries while updating in-plane and through-slice shims. Image-based magnetic-field maps are used to quantify homogeneity improvements and comparisons are made on a slice-specific basis between static global shimming and increasing orders of shim inclusion utilized DSU. The influence of oblique slicing geometry on DSU-utilized global homogeneity is also quantified computationally. Finally, the effect of DSU on susceptibility artifact reduction in single-shot axial-sliced EPI is analyzed using experimental acquisitions. (c) 2006 Elsevier Inc. All rights reserved.
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