Fast multistation water/fat imaging at 3T using DREAM-based RF shimming

Melissa T Hooijmans; Oleh Dzyubachyk; Kay Nehrke; Peter Koken; Maarten J Versluis; Hermien E Kan; Peter Börnert

doi:https://doi.org/10.1002/jmri.24775

Fast multistation water/fat imaging at 3T using DREAM-based RF shimming

Melissa T Hooijmans, Oleh Dzyubachyk, Kay Nehrke, Peter Koken, Maarten J Versluis, Hermien E Kan, Peter Börnert

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

Abstract

PURPOSE: To show the effect, efficiency, and image quality improvements achievable by Dual Refocusing Echo Acquisition Mode (DREAM)-based B1+ shimming in whole-body magnetic resonance imaging (MRI) at 3T using the example of water/fat imaging.

MATERIALS AND METHODS: 3D multistation, dual-echo mDixon gradient echo imaging was performed in 10 healthy subjects on a clinical 3T dual-transmit MRI system using station-to-station adapted B1+ shimming based on fast DREAM B1+ mapping. Whole-body data were obtained using conventional quadrature excitation and station-by-station adapted DREAM-based B1+ shimmed excitation, along with the corresponding B1+ maps for both excitation modes to assess image quality and radiofrequency (RF) performance.

RESULTS: Station-dependent DREAM-based B1+ shimming showed significantly improved image quality in the stations covering the upper legs, pelvis, and upper body region for all subjects (P < 0.02). This finding is supported by corresponding B1+ maps showing an improved B1+ homogeneity and a more precise flip angle in the DREAM-based B1+ shimmed excitation (P < 0.01). Furthermore, the very short dual-channel DREAM B1+ mapping times of less than 2 seconds facilitate quick B1+ shimming.

CONCLUSION: Station-dependent DREAM-based B1+ shimming improved RF performance and image quality and is therefore a promising technique for whole-body multistation imaging applications.

Original language	English
Pages (from-to)	217-23
Number of pages	7
Journal	Journal of magnetic resonance imaging
Volume	42
Issue number	1
DOIs	https://doi.org/10.1002/jmri.24775
Publication status	Published - Jul 2015
Externally published	Yes

Keywords

Adipose Tissue/anatomy & histology
Algorithms
Body Water/metabolism
Humans
Image Enhancement/methods
Image Interpretation, Computer-Assisted/methods
Imaging, Three-Dimensional/methods
Radio Waves
Reproducibility of Results
Sensitivity and Specificity
Whole Body Imaging/methods

Access to Document

https://doi.org/10.1002/jmri.24775

Cite this

@article{890ddf315b81422a93eb5f89acce6068,

title = "Fast multistation water/fat imaging at 3T using DREAM-based RF shimming",

abstract = "PURPOSE: To show the effect, efficiency, and image quality improvements achievable by Dual Refocusing Echo Acquisition Mode (DREAM)-based B1+ shimming in whole-body magnetic resonance imaging (MRI) at 3T using the example of water/fat imaging.MATERIALS AND METHODS: 3D multistation, dual-echo mDixon gradient echo imaging was performed in 10 healthy subjects on a clinical 3T dual-transmit MRI system using station-to-station adapted B1+ shimming based on fast DREAM B1+ mapping. Whole-body data were obtained using conventional quadrature excitation and station-by-station adapted DREAM-based B1+ shimmed excitation, along with the corresponding B1+ maps for both excitation modes to assess image quality and radiofrequency (RF) performance.RESULTS: Station-dependent DREAM-based B1+ shimming showed significantly improved image quality in the stations covering the upper legs, pelvis, and upper body region for all subjects (P < 0.02). This finding is supported by corresponding B1+ maps showing an improved B1+ homogeneity and a more precise flip angle in the DREAM-based B1+ shimmed excitation (P < 0.01). Furthermore, the very short dual-channel DREAM B1+ mapping times of less than 2 seconds facilitate quick B1+ shimming.CONCLUSION: Station-dependent DREAM-based B1+ shimming improved RF performance and image quality and is therefore a promising technique for whole-body multistation imaging applications.",

keywords = "Adipose Tissue/anatomy & histology, Algorithms, Body Water/metabolism, Humans, Image Enhancement/methods, Image Interpretation, Computer-Assisted/methods, Imaging, Three-Dimensional/methods, Radio Waves, Reproducibility of Results, Sensitivity and Specificity, Whole Body Imaging/methods",

author = "Hooijmans, {Melissa T} and Oleh Dzyubachyk and Kay Nehrke and Peter Koken and Versluis, {Maarten J} and Kan, {Hermien E} and Peter B{\"o}rnert",

note = "{\textcopyright} 2014 Wiley Periodicals, Inc.",

year = "2015",

month = jul,

doi = "https://doi.org/10.1002/jmri.24775",

language = "English",

volume = "42",

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T1 - Fast multistation water/fat imaging at 3T using DREAM-based RF shimming

AU - Hooijmans, Melissa T

AU - Dzyubachyk, Oleh

AU - Nehrke, Kay

AU - Koken, Peter

AU - Versluis, Maarten J

AU - Kan, Hermien E

AU - Börnert, Peter

PY - 2015/7

Y1 - 2015/7

N2 - PURPOSE: To show the effect, efficiency, and image quality improvements achievable by Dual Refocusing Echo Acquisition Mode (DREAM)-based B1+ shimming in whole-body magnetic resonance imaging (MRI) at 3T using the example of water/fat imaging.MATERIALS AND METHODS: 3D multistation, dual-echo mDixon gradient echo imaging was performed in 10 healthy subjects on a clinical 3T dual-transmit MRI system using station-to-station adapted B1+ shimming based on fast DREAM B1+ mapping. Whole-body data were obtained using conventional quadrature excitation and station-by-station adapted DREAM-based B1+ shimmed excitation, along with the corresponding B1+ maps for both excitation modes to assess image quality and radiofrequency (RF) performance.RESULTS: Station-dependent DREAM-based B1+ shimming showed significantly improved image quality in the stations covering the upper legs, pelvis, and upper body region for all subjects (P < 0.02). This finding is supported by corresponding B1+ maps showing an improved B1+ homogeneity and a more precise flip angle in the DREAM-based B1+ shimmed excitation (P < 0.01). Furthermore, the very short dual-channel DREAM B1+ mapping times of less than 2 seconds facilitate quick B1+ shimming.CONCLUSION: Station-dependent DREAM-based B1+ shimming improved RF performance and image quality and is therefore a promising technique for whole-body multistation imaging applications.

AB - PURPOSE: To show the effect, efficiency, and image quality improvements achievable by Dual Refocusing Echo Acquisition Mode (DREAM)-based B1+ shimming in whole-body magnetic resonance imaging (MRI) at 3T using the example of water/fat imaging.MATERIALS AND METHODS: 3D multistation, dual-echo mDixon gradient echo imaging was performed in 10 healthy subjects on a clinical 3T dual-transmit MRI system using station-to-station adapted B1+ shimming based on fast DREAM B1+ mapping. Whole-body data were obtained using conventional quadrature excitation and station-by-station adapted DREAM-based B1+ shimmed excitation, along with the corresponding B1+ maps for both excitation modes to assess image quality and radiofrequency (RF) performance.RESULTS: Station-dependent DREAM-based B1+ shimming showed significantly improved image quality in the stations covering the upper legs, pelvis, and upper body region for all subjects (P < 0.02). This finding is supported by corresponding B1+ maps showing an improved B1+ homogeneity and a more precise flip angle in the DREAM-based B1+ shimmed excitation (P < 0.01). Furthermore, the very short dual-channel DREAM B1+ mapping times of less than 2 seconds facilitate quick B1+ shimming.CONCLUSION: Station-dependent DREAM-based B1+ shimming improved RF performance and image quality and is therefore a promising technique for whole-body multistation imaging applications.

KW - Adipose Tissue/anatomy & histology

KW - Algorithms

KW - Body Water/metabolism

KW - Humans

KW - Image Enhancement/methods

KW - Image Interpretation, Computer-Assisted/methods

KW - Imaging, Three-Dimensional/methods

KW - Radio Waves

KW - Reproducibility of Results

KW - Sensitivity and Specificity

KW - Whole Body Imaging/methods

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DO - https://doi.org/10.1002/jmri.24775

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