Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.

Knowledge of the transmission field (B1(+)) of radio-frequency coils is crucial for high field (B0  = 3.0 T) and ultrahigh field (B0 ≥7.0 T) magnetic resonance applications to overcome constraints dictated by electrodynamics in the short wavelength regime with the ultimate goal to improve the image...

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Main Authors: Flavio Carinci, Davide Santoro, Federico von Samson-Himmelstjerna, Tomasz Dawid Lindel, Matthias Alexander Dieringer, Thoralf Niendorf
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2013-01-01
Series:PLoS ONE
Online Access:http://europepmc.org/articles/PMC3589447?pdf=render
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author Flavio Carinci
Davide Santoro
Federico von Samson-Himmelstjerna
Tomasz Dawid Lindel
Matthias Alexander Dieringer
Thoralf Niendorf
author_facet Flavio Carinci
Davide Santoro
Federico von Samson-Himmelstjerna
Tomasz Dawid Lindel
Matthias Alexander Dieringer
Thoralf Niendorf
author_sort Flavio Carinci
collection DOAJ
description Knowledge of the transmission field (B1(+)) of radio-frequency coils is crucial for high field (B0  = 3.0 T) and ultrahigh field (B0 ≥7.0 T) magnetic resonance applications to overcome constraints dictated by electrodynamics in the short wavelength regime with the ultimate goal to improve the image quality. For this purpose B1(+) mapping methods are used, which are commonly magnitude-based. In this study an analysis of five phase-based methods for three-dimensional mapping of the B1(+) field is presented. The five methods are implemented in a 3D gradient-echo technique. Each method makes use of different RF-pulses (composite or off-resonance pulses) to encode the effective intensity of the B1(+) field into the phase of the magnetization. The different RF-pulses result in different trajectories of the magnetization, different use of the transverse magnetization and different sensitivities to B1(+) inhomogeneities and frequency offsets, as demonstrated by numerical simulations. The characterization of the five methods also includes phantom experiments and in vivo studies of the human brain at 3.0 T and at 7.0 T. It is shown how the characteristics of each method affect the quality of the B1(+) maps. Implications for in vivo B1(+) mapping at 3.0 T and 7.0 T are discussed.
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spelling doaj.art-7b85bd1e5a1442fea86b7f0532f69c7b2022-12-22T01:29:43ZengPublic Library of Science (PLoS)PLoS ONE1932-62032013-01-0183e5798210.1371/journal.pone.0057982Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.Flavio CarinciDavide SantoroFederico von Samson-HimmelstjernaTomasz Dawid LindelMatthias Alexander DieringerThoralf NiendorfKnowledge of the transmission field (B1(+)) of radio-frequency coils is crucial for high field (B0  = 3.0 T) and ultrahigh field (B0 ≥7.0 T) magnetic resonance applications to overcome constraints dictated by electrodynamics in the short wavelength regime with the ultimate goal to improve the image quality. For this purpose B1(+) mapping methods are used, which are commonly magnitude-based. In this study an analysis of five phase-based methods for three-dimensional mapping of the B1(+) field is presented. The five methods are implemented in a 3D gradient-echo technique. Each method makes use of different RF-pulses (composite or off-resonance pulses) to encode the effective intensity of the B1(+) field into the phase of the magnetization. The different RF-pulses result in different trajectories of the magnetization, different use of the transverse magnetization and different sensitivities to B1(+) inhomogeneities and frequency offsets, as demonstrated by numerical simulations. The characterization of the five methods also includes phantom experiments and in vivo studies of the human brain at 3.0 T and at 7.0 T. It is shown how the characteristics of each method affect the quality of the B1(+) maps. Implications for in vivo B1(+) mapping at 3.0 T and 7.0 T are discussed.http://europepmc.org/articles/PMC3589447?pdf=render
spellingShingle Flavio Carinci
Davide Santoro
Federico von Samson-Himmelstjerna
Tomasz Dawid Lindel
Matthias Alexander Dieringer
Thoralf Niendorf
Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.
PLoS ONE
title Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.
title_full Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.
title_fullStr Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.
title_full_unstemmed Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.
title_short Characterization of phase-based methods used for transmission field uniformity mapping: a magnetic resonance study at 3.0 T and 7.0 T.
title_sort characterization of phase based methods used for transmission field uniformity mapping a magnetic resonance study at 3 0 t and 7 0 t
url http://europepmc.org/articles/PMC3589447?pdf=render
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