SENSE shimming (SSH): A fast approach for determining B(0) field inhomogeneities using sensitivity coding

The pursuit of ever higher field strengths and faster data acquisitions has led to the construction of coil arrays with high numbers of elements. With the sensitivity encoding (SENSE) technique, it has been shown that the sensitivity of those elements can be used for spatial image encoding. Here, a...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2009-11, Vol.62 (5), p.1319-1325
Main Authors: Splitthoff, D N, Zaitsev, M
Format: Article
Language:English
Subjects:
Algorithms
Anisotropy
Humans
Image Enhancement - methods
Image Interpretation, Computer-Assisted - methods
Information Storage and Retrieval - methods
Magnetic Resonance Imaging - methods
Phantoms, Imaging
Reproducibility of Results
Sensitivity and Specificity
Signal Processing, Computer-Assisted
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Summary:The pursuit of ever higher field strengths and faster data acquisitions has led to the construction of coil arrays with high numbers of elements. With the sensitivity encoding (SENSE) technique, it has been shown that the sensitivity of those elements can be used for spatial image encoding. Here, a proof-of-principle is presented of a method that can be considered an extreme case of the SENSE approach, completely abstaining from using encoding gradients. The resulting sensitivity encoded free-induction decay (FID) data are then not used for imaging, but for determining B(0) field inhomogeneity distribution. The method has therefore been termed "SENSE shimming" (SSH). In phantom experiments the method's ability to detect inhomogeneities of up to the second order is demonstrated.
ISSN:1522-2594
DOI:10.1002/mrm.22083