Regularized higher-order in vivo shimming

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

Research output: Contribution to journalArticle

167 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

Fingerprint

Least-Squares Analysis

All Science Journal Classification (ASJC) codes

  • Radiology Nuclear Medicine and imaging

Cite this

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
Kim, Donghyun ; Adalsteinsson, Elfar ; Glover, Gary H. ; Spielman, Daniel M. / Regularized higher-order in vivo shimming. In: Magnetic Resonance in Medicine. 2002 ; Vol. 48, No. 4. pp. 715-722.
@article{f792dd6ba09e4580b2a3e874055888fa,
title = "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-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.",
author = "Donghyun Kim and Elfar Adalsteinsson and Glover, {Gary H.} and Spielman, {Daniel M.}",
year = "2002",
month = "10",
day = "1",
doi = "10.1002/mrm.10267",
language = "English",
volume = "48",
pages = "715--722",
journal = "Magnetic Resonance in Medicine",
issn = "0740-3194",
publisher = "John Wiley and Sons Inc.",
number = "4",

}

Kim, D, Adalsteinsson, E, Glover, GH & Spielman, DM 2002, 'Regularized higher-order in vivo shimming', Magnetic Resonance in Medicine, vol. 48, no. 4, pp. 715-722. https://doi.org/10.1002/mrm.10267

Regularized higher-order in vivo shimming. / Kim, Donghyun; Adalsteinsson, Elfar; Glover, Gary H.; Spielman, Daniel M.

In: Magnetic Resonance in Medicine, Vol. 48, No. 4, 01.10.2002, p. 715-722.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Regularized higher-order in vivo shimming

AU - Kim, Donghyun

AU - Adalsteinsson, Elfar

AU - Glover, Gary H.

AU - Spielman, Daniel M.

PY - 2002/10/1

Y1 - 2002/10/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0036787384&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036787384&partnerID=8YFLogxK

U2 - 10.1002/mrm.10267

DO - 10.1002/mrm.10267

M3 - Article

VL - 48

SP - 715

EP - 722

JO - Magnetic Resonance in Medicine

JF - Magnetic Resonance in Medicine

SN - 0740-3194

IS - 4

ER -

Kim D, Adalsteinsson E, Glover GH, Spielman DM. Regularized higher-order in vivo shimming. Magnetic Resonance in Medicine. 2002 Oct 1;48(4):715-722. https://doi.org/10.1002/mrm.10267