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Inflow effects on functional MRI.

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.neuroimage.2011.09.088 Byline: Jia-Hong Gao, Ho-Ling Liu Keywords: MRI; Functional MRI (fMRI); Inflow effects; Time-of-flight (TOF); Blood oxygen level-dependent (BOLD) Abstract: Blood inflow from the upstream... Full description

Journal Title: NeuroImage Vol.62(2), pp.1035-1039
Main Author: Gao, Jia-Hong
Other Authors: Liu, Ho-Ling
Format: Electronic Article Electronic Article
Language: English
Subjects:
Created: August 15, 2012
ID: E-ISSN: 1095-9572 ; DOI: 1095-9572 ; DOI: 10.1016/j.neuroimage.2011.09.088
Link: http://search.proquest.com/docview/1023295136/?pq-origsite=primo
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title: Inflow effects on functional MRI.
format: Article
creator:
  • Gao, Jia-Hong
  • Liu, Ho-Ling
subjects:
  • Brain–Blood Supply
  • Brain Mapping–Physiology
  • Cerebrovascular Circulation–History
  • History, 20th Century–Methods
  • History, 21st Century–Physiology
  • Humans–History
  • Magnetic Resonance Imaging–Methods
  • Oxygen–Blood
  • Oxygen
ispartof: NeuroImage, Vol.62(2), pp.1035-1039
description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.neuroimage.2011.09.088 Byline: Jia-Hong Gao, Ho-Ling Liu Keywords: MRI; Functional MRI (fMRI); Inflow effects; Time-of-flight (TOF); Blood oxygen level-dependent (BOLD) Abstract: Blood inflow from the upstream has contribution or contamination to the blood oxygen level-dependent (BOLD) functional signal both in its magnitude and time courses. During neuronal activations, regional blood flow velocity increases which results in increased fMRI signals near the macrovasculatures. The inflow effects are dependent on RF pulse history, slice geometry, flow velocity, blood relaxation times and imaging parameters. In general, the effect is stronger with more T.sub.1 weighting in the signal, e.g. by using a short repetition time and a large flip angle. This article reviews the basic principle of the inflow effects, its appearances in conventional GRE, fast spin-echo (FSE) and echo-planar imaging (EPI) acquisitions, methods for separating the inflow from the BOLD effect as well as the interplay between imaging parameters and other physiological factors with the inflow effects in fMRI. Based on theoretical derivation and human experiments, the inflow effects have been shown to contribute significantly in conventional GRE but negligible in FSE acquisitions. For gradient-echo EPI experiments, the blood inflow could modulate both amplitude and the temporal information of the fMRI signal, depending on the imaging parameters and settings. Article History: Accepted 30 September 2011
language: eng
source:
identifier: E-ISSN: 1095-9572 ; DOI: 1095-9572 ; DOI: 10.1016/j.neuroimage.2011.09.088
fulltext: fulltext
issn:
  • 10959572
  • 1095-9572
url: Link


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titleInflow effects on functional MRI.
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descriptionTo link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.neuroimage.2011.09.088 Byline: Jia-Hong Gao, Ho-Ling Liu Keywords: MRI; Functional MRI (fMRI); Inflow effects; Time-of-flight (TOF); Blood oxygen level-dependent (BOLD) Abstract: Blood inflow from the upstream has contribution or contamination to the blood oxygen level-dependent (BOLD) functional signal both in its magnitude and time courses. During neuronal activations, regional blood flow velocity increases which results in increased fMRI signals near the macrovasculatures. The inflow effects are dependent on RF pulse history, slice geometry, flow velocity, blood relaxation times and imaging parameters. In general, the effect is stronger with more T.sub.1 weighting in the signal, e.g. by using a short repetition time and a large flip angle. This article reviews the basic principle of the inflow effects, its appearances in conventional GRE, fast spin-echo (FSE) and echo-planar imaging (EPI) acquisitions, methods for separating the inflow from the BOLD effect as well as the interplay between imaging parameters and other physiological factors with the inflow effects in fMRI. Based on theoretical derivation and human experiments, the inflow effects have been shown to contribute significantly in conventional GRE but negligible in FSE acquisitions. For gradient-echo EPI experiments, the blood inflow could modulate both amplitude and the temporal information of the fMRI signal, depending on the imaging parameters and settings. Article History: Accepted 30 September 2011
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