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Regularized higher‐order in vivo shimming
Abstract
A regularized algorithm is presented for localized in vivo shimming. The technique uses first‐ (X,Y,Z), second‐ (Z2, ZX, ZY, X2‐Y2, XY), and third‐order (Z3) shim coils, and is robust when applied to arbitrarily‐shaped, as well as off‐center, regions of interest (ROIs). A single‐shot spiral pulse sequence is used for rapid field map acquisition, and a least‐squares calculation of the shim currents is performed to minimize the root‐mean‐square (RMS) value of the B0 inhomogeneity over a user‐selected ROI. The use of a singular value decomposition (SVD) in combination with a regularization algorithm significantly improves the numerical stability of the least‐squares fitting procedure. The fully automated shimming package is implemented on a 3 T GE Signa system and its robust performance is demonstrated in phantom and in vivo studies. Magn Reson Med 48:715–722, 2002. © 2002 Wiley‐Liss, Inc.
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Cited by
Sridharan, D., Levitin, D. J., & Menon, V. (2008) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0800005105 · Cited by 2,892
Decoding subject-driven cognitive states with whole-brain connectivity patterns
Shirer, W. R., Ryali, S., Rykhlevskaia, E., Menon, V., & Greicius, M. D. (2012) · Cerebral Cortex · doi:10.1093/cercor/bhr099 · Cited by 1,843
Time–frequency dynamics of resting-state brain connectivity measured with fMRI
Chang, C., & Glover, G. H. (2010) · NeuroImage · doi:10.1016/j.neuroimage.2009.12.011 · Cited by 1,808
Self-citationDistinct cerebellar contributions to intrinsic connectivity networks
Habas, C., Kamdar, N., Nguyen, D., Prater, K., Beckmann, C. F., Menon, V., & Greicius, M. D. (2009) · Journal of Neuroscience · doi:10.1523/jneurosci.1868-09.2009 · Cited by 1,115
Dai, W., Garcia, D., de Bazelaire, C., & Alsop, D. C. (2008) · Magnetic Resonance in Medicine · doi:10.1002/mrm.21790 · Cited by 985
Metadata
- Authors
- Kim, D., Adalsteinsson, E., Glover, G. H., & Spielman, D. M.
- Venue
- Magnetic Resonance in Medicine
- Publisher
- Wiley
- Published
- 2002-09-26
- Volume
- 48
- Issue
- 4
- Pages
- 715-722
- ISSN
- 0740-3194 (ISSN-L)
- 1522-2594
- OpenAlex
- W1995216385
- Cited by
- 200
- References
- 0
- FWCI
- 3.32
- Type
- journal article
- Language
- en
- Open access
- closed
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