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The effects of concomitant gradients on chemical shift encoded MRI

Byline: Timothy J. Colgan, Diego Hernando, Samir D. Sharma, Scott B. Reeder Keywords: concomitant gradients; chemical shift encoded MRI; PDFF; iron quantification; R2* estimation; B.sub.0 field map estimation Purpose The purpose of this work was to characterize the effects of concomitant gradients (... Full description

Journal Title: Magnetic Resonance in Medicine August 2017, Vol.78(2), pp.730-738
Main Author: Colgan, Timothy J.
Other Authors: Hernando, Diego , Sharma, Samir D. , Reeder, Scott B.
Format: Electronic Article Electronic Article
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Subjects:
ID: ISSN: 0740-3194 ; E-ISSN: 1522-2594 ; DOI: 10.1002/mrm.26461
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recordid: wj10.1002/mrm.26461
title: The effects of concomitant gradients on chemical shift encoded MRI
format: Article
creator:
  • Colgan, Timothy J.
  • Hernando, Diego
  • Sharma, Samir D.
  • Reeder, Scott B.
subjects:
  • Concomitant Gradients
  • Chemical Shift Encoded Mri
  • Pdff
  • Iron Quantification
  • R 2 * Estimation
  • B 0 Field Map Estimation
ispartof: Magnetic Resonance in Medicine, August 2017, Vol.78(2), pp.730-738
description: Byline: Timothy J. Colgan, Diego Hernando, Samir D. Sharma, Scott B. Reeder Keywords: concomitant gradients; chemical shift encoded MRI; PDFF; iron quantification; R2* estimation; B.sub.0 field map estimation Purpose The purpose of this work was to characterize the effects of concomitant gradients (CGs) on chemical shift encoded (CSE)-based estimation of B.sub.0 field map, proton density fat fraction (PDFF), and R2*. Theory A theoretical framework was used to determine the effects of CG-induced phase errors on CSE-MRI data. Methods Simulations, phantom experiments, and in vivo experiments were conducted at 3 Tesla to assess the effects of CGs on quantitative CSE-MRI techniques. Correction of phase errors attributable to CGs was also investigated to determine whether these effects could be removed. Results Phase errors attributed to CGs introduce errors in the estimation of B.sub.0 field map, PDFF, and R2*. Phantom and in vivo experiments demonstrated that CGs can introduce estimation errors greater than 30Hz in the B.sub.0 field map, 10% in PDFF, and 16 s.sub.-1 in R2*, 16cm off isocenter. However, CG phase correction before parameter estimation was able to reduce estimation errors to less than 10Hz in the B.sub.0 field map, 1% in PDFF, and 2 s.sub.-1 in R2*. Conclusion CG effects can impact CSE-MRI, leading to inaccurate estimation of B.sub.0 field map, PDFF, and R2*. However, correction for phase errors caused by CGs improve the accuracy of quantitative parameters estimated from CSE-MRI acquisitions. Magn Reson Med 78:730-738, 2017. [c] 2016 International Society for Magnetic Resonance in Medicine
language:
source:
identifier: ISSN: 0740-3194 ; E-ISSN: 1522-2594 ; DOI: 10.1002/mrm.26461
fulltext: fulltext
issn:
  • 0740-3194
  • 07403194
  • 1522-2594
  • 15222594
url: Link


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titleThe effects of concomitant gradients on chemical shift encoded MRI
creatorColgan, Timothy J. ; Hernando, Diego ; Sharma, Samir D. ; Reeder, Scott B.
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descriptionByline: Timothy J. Colgan, Diego Hernando, Samir D. Sharma, Scott B. Reeder Keywords: concomitant gradients; chemical shift encoded MRI; PDFF; iron quantification; R2* estimation; B.sub.0 field map estimation Purpose The purpose of this work was to characterize the effects of concomitant gradients (CGs) on chemical shift encoded (CSE)-based estimation of B.sub.0 field map, proton density fat fraction (PDFF), and R2*. Theory A theoretical framework was used to determine the effects of CG-induced phase errors on CSE-MRI data. Methods Simulations, phantom experiments, and in vivo experiments were conducted at 3 Tesla to assess the effects of CGs on quantitative CSE-MRI techniques. Correction of phase errors attributable to CGs was also investigated to determine whether these effects could be removed. Results Phase errors attributed to CGs introduce errors in the estimation of B.sub.0 field map, PDFF, and R2*. Phantom and in vivo experiments demonstrated that CGs can introduce estimation errors greater than 30Hz in the B.sub.0 field map, 10% in PDFF, and 16 s.sub.-1 in R2*, 16cm off isocenter. However, CG phase correction before parameter estimation was able to reduce estimation errors to less than 10Hz in the B.sub.0 field map, 1% in PDFF, and 2 s.sub.-1 in R2*. Conclusion CG effects can impact CSE-MRI, leading to inaccurate estimation of B.sub.0 field map, PDFF, and R2*. However, correction for phase errors caused by CGs improve the accuracy of quantitative parameters estimated from CSE-MRI acquisitions. Magn Reson Med 78:730-738, 2017. [c] 2016 International Society for Magnetic Resonance in Medicine
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