Regularized higher-order in vivo shimming

Dong Hyun Kim; Elfar Adalsteinsson; Gary H. Glover; Daniel M. Spielman

doi:10.1002/mrm.10267

Regularized higher-order in vivo shimming

Dong Hyun Kim, Elfar Adalsteinsson, Gary H. Glover, Daniel M. Spielman

Department of Electrical and Electronic Engineering

Research output: Contribution to journal › Article › peer-review

175 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 language	English
Pages (from-to)	715-722
Number of pages	8
Journal	Magnetic Resonance in Medicine
Volume	48
Issue number	4
DOIs	https://doi.org/10.1002/mrm.10267
Publication status	Published - 2002 Oct 1

All Science Journal Classification (ASJC) codes

Radiology Nuclear Medicine and imaging

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10.1002/mrm.10267

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AU - Spielman, Daniel M.

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Regularized higher-order in vivo shimming

Abstract

All Science Journal Classification (ASJC) codes

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