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High‐resolution whole‐brain diffusion MRI at 7T using radiofrequency parallel transmission

Investigating the utility of RF parallel transmission (pTx) for Human Connectome Project (HCP)-style whole-brain diffusion MRI (dMRI) data at 7 Tesla (7T). Healthy subjects were scanned in pTx and single-transmit (1Tx) modes. Multiband (MB), single-spoke pTx pulses were designed to image sagittal sl... Full description

Journal Title: Magnetic Resonance in Medicine November 2018, Vol.80(5), pp.1857-1870
Main Author: Wu, Xiaoping
Other Authors: Auerbach, Edward J. , Vu, An T. , Moeller, Steen , Lenglet, Christophe , Schmitter, Sebastian , Van De Moortele, Pierre‐François , Yacoub, Essa , Uğurbil, Kâmil
Format: Electronic Article Electronic Article
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ID: ISSN: 0740-3194 ; E-ISSN: 1522-2594 ; DOI: 10.1002/mrm.27189
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recordid: wj10.1002/mrm.27189
title: High‐resolution whole‐brain diffusion MRI at 7T using radiofrequency parallel transmission
format: Article
creator:
  • Wu, Xiaoping
  • Auerbach, Edward J.
  • Vu, An T.
  • Moeller, Steen
  • Lenglet, Christophe
  • Schmitter, Sebastian
  • Van De Moortele, Pierre‐François
  • Yacoub, Essa
  • Uğurbil, Kâmil
subjects:
  • Parallel Transmission
  • Simultaneous Multi‐Slice
  • Diffusion Mri
  • High‐Field Mri
  • Human Connectome Project
ispartof: Magnetic Resonance in Medicine, November 2018, Vol.80(5), pp.1857-1870
description: Investigating the utility of RF parallel transmission (pTx) for Human Connectome Project (HCP)-style whole-brain diffusion MRI (dMRI) data at 7 Tesla (7T). Healthy subjects were scanned in pTx and single-transmit (1Tx) modes. Multiband (MB), single-spoke pTx pulses were designed to image sagittal slices. HCP-style dMRI data (i.e., 1.05-mm resolutions, MB2, b-values = 1000/2000 s/mm , 286 images and 40-min scan) and data with higher accelerations (MB3 and MB4) were acquired with pTx. pTx significantly improved flip-angle detected signal uniformity across the brain, yielding ∼19% increase in temporal SNR (tSNR) averaged over the brain relative to 1Tx. This allowed significantly enhanced estimation of multiple fiber orientations (with ∼21% decrease in dispersion) in HCP-style 7T dMRI datasets. Additionally, pTx pulses achieved substantially lower power deposition, permitting higher accelerations, enabling collection of the same data in 2/3 and 1/2 the scan time or of more data in the same scan time. pTx provides a solution to two major limitations for slice-accelerated high-resolution whole-brain dMRI at 7T; it improves flip-angle uniformity, and enables higher slice acceleration relative to current state-of-the-art. As such, pTx provides significant advantages for rapid acquisition of high-quality, high-resolution truly whole-brain dMRI data.
language:
source:
identifier: ISSN: 0740-3194 ; E-ISSN: 1522-2594 ; DOI: 10.1002/mrm.27189
fulltext: fulltext
issn:
  • 0740-3194
  • 07403194
  • 1522-2594
  • 15222594
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titleHigh‐resolution whole‐brain diffusion MRI at 7T using radiofrequency parallel transmission
creatorWu, Xiaoping ; Auerbach, Edward J. ; Vu, An T. ; Moeller, Steen ; Lenglet, Christophe ; Schmitter, Sebastian ; Van De Moortele, Pierre‐François ; Yacoub, Essa ; Uğurbil, Kâmil
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descriptionInvestigating the utility of RF parallel transmission (pTx) for Human Connectome Project (HCP)-style whole-brain diffusion MRI (dMRI) data at 7 Tesla (7T). Healthy subjects were scanned in pTx and single-transmit (1Tx) modes. Multiband (MB), single-spoke pTx pulses were designed to image sagittal slices. HCP-style dMRI data (i.e., 1.05-mm resolutions, MB2, b-values = 1000/2000 s/mm , 286 images and 40-min scan) and data with higher accelerations (MB3 and MB4) were acquired with pTx. pTx significantly improved flip-angle detected signal uniformity across the brain, yielding ∼19% increase in temporal SNR (tSNR) averaged over the brain relative to 1Tx. This allowed significantly enhanced estimation of multiple fiber orientations (with ∼21% decrease in dispersion) in HCP-style 7T dMRI datasets. Additionally, pTx pulses achieved substantially lower power deposition, permitting higher accelerations, enabling collection of the same data in 2/3 and 1/2 the scan time or of more data in the same scan time. pTx provides a solution to two major limitations for slice-accelerated high-resolution whole-brain dMRI at 7T; it improves flip-angle uniformity, and enables higher slice acceleration relative to current state-of-the-art. As such, pTx provides significant advantages for rapid acquisition of high-quality, high-resolution truly whole-brain dMRI data.
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titleHigh‐resolution whole‐brain diffusion MRI at 7T using radiofrequency parallel transmission
authorWu, Xiaoping ; Auerbach, Edward J. ; Vu, An T. ; Moeller, Steen ; Lenglet, Christophe ; Schmitter, Sebastian ; Van De Moortele, Pierre‐François ; Yacoub, Essa ; Uğurbil, Kâmil
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