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Less noise, more activation: Multiband acquisition schemes for auditory functional MRI

To purchase or authenticate to the full-text of this article, please visit this link: http://onlinelibrary.wiley.com/doi/10.1002/mrm.25408/abstract Byline: Federico De Martino, Michelle Moerel, Kamil Ugurbil, Elia Formisano, Essa Yacoub Keywords: GE-EPI; auditory fMRI; scanner noise Purpose To impro... Full description

Journal Title: Magnetic Resonance in Medicine 2015, Vol.74(2), pp.462-467
Main Author: De Martino, Federico
Other Authors: Moerel, Michelle , Ugurbil, Kamil , Formisano, Elia , Yacoub, Essa
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: ; ISSN: 0740-3194
Link: https://cris.maastrichtuniversity.nl/portal/en/publications/less-noise-more-activation-multiband-acquisition-schemes-for-auditory-functional-mri(bd73ef95-e09e-4cc1-8e77-86b8853e888f).html
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recordid: narcisum:oai:cris.maastrichtuniversity.nl:publications/bd73ef95-e09e-4cc1-8e77-86b8853e888f
title: Less noise, more activation: Multiband acquisition schemes for auditory functional MRI
format: Article
creator:
  • De Martino, Federico
  • Moerel, Michelle
  • Ugurbil, Kamil
  • Formisano, Elia
  • Yacoub, Essa
subjects:
  • Ge-Epi
  • Auditory Fmri
  • Scanner Noise
ispartof: Magnetic Resonance in Medicine, 2015, Vol.74(2), pp.462-467
description: To purchase or authenticate to the full-text of this article, please visit this link: http://onlinelibrary.wiley.com/doi/10.1002/mrm.25408/abstract Byline: Federico De Martino, Michelle Moerel, Kamil Ugurbil, Elia Formisano, Essa Yacoub Keywords: GE-EPI; auditory fMRI; scanner noise Purpose To improve acquisition in fMRI studies of audition by using multiband (MB) gradient-echo echo planar imaging (GE-EPI). Methods Data were acquired at 3T (Siemens Skyra) with a 32-channel head coil. Functional responses were obtained by presenting stimuli [tones and natural sounds (voices, speech, music, tools, animal cries)] in silent gaps between image acquisitions. Two-fold slice acceleration (MB2) was compared with a standard GE-EPI (MB1). Coverage and sampling rate (TR=3 s) were kept constant across acquisition schemes. The longer gap in MB2 scans was used to present: (i) sounds of the same length as in conventional GE-EPI (type 1; 800 ms stimuli); (ii) sounds of double the length (type 2; 1600 ms stimuli). Results Functional responses to all sounds (i.e., main effect) were stronger when acquired with slice acceleration (i.e., shorter acquisition time). The difference between voice and nonvoice responses was greater in MB2 type 1 acquisitions (i.e., same length sounds as GE-EPI but presented in a longer silent gap) than in standard GE-EPI acquisitions (interaction effect). Conclusion Reducing the length of the scanner noise results in stronger functional responses. Longer "silent" periods (i.e., keeping the sound length the same as in standard acquisitions) result in stronger response to voice compared with nonvoice stimuli. Magn Reson Med 74:462-467, 2015. [c] 2014 Wiley Periodicals, Inc.
language: eng
source:
identifier: ISSN: ; ISSN: 0740-3194
fulltext: fulltext
issn:
  • 0740-3194
url: Link


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descriptionTo purchase or authenticate to the full-text of this article, please visit this link: http://onlinelibrary.wiley.com/doi/10.1002/mrm.25408/abstract Byline: Federico De Martino, Michelle Moerel, Kamil Ugurbil, Elia Formisano, Essa Yacoub Keywords: GE-EPI; auditory fMRI; scanner noise Purpose To improve acquisition in fMRI studies of audition by using multiband (MB) gradient-echo echo planar imaging (GE-EPI). Methods Data were acquired at 3T (Siemens Skyra) with a 32-channel head coil. Functional responses were obtained by presenting stimuli [tones and natural sounds (voices, speech, music, tools, animal cries)] in silent gaps between image acquisitions. Two-fold slice acceleration (MB2) was compared with a standard GE-EPI (MB1). Coverage and sampling rate (TR=3 s) were kept constant across acquisition schemes. The longer gap in MB2 scans was used to present: (i) sounds of the same length as in conventional GE-EPI (type 1; 800 ms stimuli); (ii) sounds of double the length (type 2; 1600 ms stimuli). Results Functional responses to all sounds (i.e., main effect) were stronger when acquired with slice acceleration (i.e., shorter acquisition time). The difference between voice and nonvoice responses was greater in MB2 type 1 acquisitions (i.e., same length sounds as GE-EPI but presented in a longer silent gap) than in standard GE-EPI acquisitions (interaction effect). Conclusion Reducing the length of the scanner noise results in stronger functional responses. Longer "silent" periods (i.e., keeping the sound length the same as in standard acquisitions) result in stronger response to voice compared with nonvoice stimuli. Magn Reson Med 74:462-467, 2015. [c] 2014 Wiley Periodicals, Inc.
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