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  Isotropic submillimeter fMRI in the human brain at 7 T: Combining reduced field-of-view imaging and partially parallel acquisitions

Heidemann, R. M., Ivanov, D., Trampel, R., Fasano, F., Meyer, H., Pfeuffer, J., et al. (2012). Isotropic submillimeter fMRI in the human brain at 7 T: Combining reduced field-of-view imaging and partially parallel acquisitions. Magnetic Resonance in Medicine, 68(5), 1506-1516. doi:10.1002/mrm.24156.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-1579-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-CC5A-3
Genre: Journal Article

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 Creators:
Heidemann, Robin M.1, Author              
Ivanov, Dimo1, Author              
Trampel, Robert1, Author              
Fasano, Fabrizio2, Author
Meyer, Heiko3, Author
Pfeuffer, Josef3, Author
Turner, Robert1, Author              
Affiliations:
1Department Neurophysics, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634550              
2Department of Neuroscience, University of Parma, Italy, ou_persistent22              
3Siemens Sector Healthcare, Erlangen, Germany, ou_persistent22              

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Free keywords: Reduced field-of-view; Parallel imaging; BOLD imaging; fMRI; Outer-volume suppression; Ultrahigh field
 Abstract: Echo-planar imaging is the most widely used imaging sequence for functional magnetic resonance imaging (fMRI) due to its fast acquisition. However, it is prone to local distortions, image blurring, and signal voids. As these effects scale with echo train length and field strength, it is essential for high-resolution echo-planar imaging at ultrahigh field to address these problems. Partially parallel acquisition methods can be used to improve the image quality of echo-planar imaging. However, partially parallel acquisition can be affected by aliasing artifacts and noise enhancement. Another way to shorten the echo train length is to reduce the field-of-view (FOV) while maintaining the same spatial resolution. However, to achieve significant acceleration, the resulting FOV becomes very small. Another problem occurs when FOV selection is incomplete such that there is remaining signal aliased from the region outside the reduced FOV. In this article, a novel approach, a combination of reduced FOV imaging with partially parallel acquisition, is presented. This approach can address the problems described above of each individual method, enabling high-quality single-shot echo-planar imaging acquisition, with submillimeter isotropic resolution and good signal-tonoise ratio, for fMRI at ultrahigh field strength. This is demonstrated in fMRI of human brain at 7T with an isotropic resolution of 650 mm.

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Language(s): eng - English
 Dates: 2011-12-162012-01-092012-10-23
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1002/mrm.24156
PMID: 22231859
Other: Epub 2012
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Pages: - Volume / Issue: 68 (5) Sequence Number: - Start / End Page: 1506 - 1516 Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149