Document Detail

Two-axis acceleration of functional connectivity magnetic resonance imaging by parallel excitation of phase-tagged slices and half k-space acceleration.
MedLine Citation:
PMID:  22432957     Owner:  NLM     Status:  MEDLINE    
Whole brain functional connectivity magnetic resonance imaging requires acquisition of a time course of gradient-recalled (GR) volumetric images. A method is developed to accelerate this acquisition using GR echo-planar imaging and radio frequency (RF) slice phase tagging. For N-fold acceleration, a tailored RF pulse excites N slices using a uniform-field transmit coil. This pulse is the Fourier transform of the profile for the N slices with a predetermined RF phase tag on each slice. A multichannel RF receive coil is used for detection. For n slices, there are n/N groups of slices. Signal-averaged reference images are created for each slice within each slice group for each member of the coil array and used to separate overlapping images that are simultaneously received. The time-overhead for collection of reference images is small relative to the acquisition time of a complete volumetric time course. A least-squares singular value decomposition method allows image separation on a pixel-by-pixel basis. Twofold slice acceleration is demonstrated using an eight-channel RF receive coil, with application to resting-state functional magnetic resonance imaging in the human brain. Data from six subjects at 3 T are reported. The method has been extended to half k-space acquisition, which not only provides additional acceleration, but also facilitates slice separation because of increased signal intensity of the central lines of k-space coupled with reduced susceptibility effects.
Andrzej Jesmanowicz; Andrew S Nencka; Shi-Jiang Li; James S Hyde
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural    
Journal Detail:
Title:  Brain connectivity     Volume:  1     ISSN:  2158-0022     ISO Abbreviation:  Brain Connect     Publication Date:  2011  
Date Detail:
Created Date:  2012-03-21     Completed Date:  2013-01-24     Revised Date:  2014-09-15    
Medline Journal Info:
Nlm Unique ID:  101550313     Medline TA:  Brain Connect     Country:  United States    
Other Details:
Languages:  eng     Pagination:  81-90     Citation Subset:  IM    
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MeSH Terms
Brain / physiology*
Brain Mapping / methods*
Echo-Planar Imaging / methods*
Magnetic Resonance Imaging / methods
Nerve Net / physiology*
Grant Support
R01 EB000215/EB/NIBIB NIH HHS; R01 EB007827/EB/NIBIB NIH HHS; R01 EB007827/EB/NIBIB NIH HHS; R01 EB007827-01A2/EB/NIBIB NIH HHS; R01 EB007827-02/EB/NIBIB NIH HHS; R01 EB007827-03/EB/NIBIB NIH HHS; R01 EB007827-04/EB/NIBIB NIH HHS

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