Regularized higher-order in vivo shimming

Donghyun Kim, Elfar Adalsteinsson, Gary H. Glover, Daniel M. Spielman

Research output: Contribution to journalArticle

173 Citations (Scopus)

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-meansquare (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.

Original languageEnglish
Pages (from-to)715-722
Number of pages8
JournalMagnetic Resonance in Medicine
Volume48
Issue number4
DOIs
Publication statusPublished - 2002 Oct 1

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

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    Kim, D., Adalsteinsson, E., Glover, G. H., & Spielman, D. M. (2002). Regularized higher-order in vivo shimming. Magnetic Resonance in Medicine, 48(4), 715-722. https://doi.org/10.1002/mrm.10267