Investigation of high-resolution functional magnetic resonance imaging by means of surface and array radiofrequency coils at 7 T.

Details

Serval ID
serval:BIB_D2CCE1BBAF3C
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Investigation of high-resolution functional magnetic resonance imaging by means of surface and array radiofrequency coils at 7 T.
Journal
Magnetic Resonance Imaging
Author(s)
van der Zwaag W., Marques J.P., Hergt M., Gruetter R.
ISSN
1873-5894 (Electronic)
ISSN-L
0730-725X
Publication state
Published
Issued date
2009
Volume
27
Number
8
Pages
1011-1018
Language
english
Notes
Publication types: Evaluation Studies ; Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Abstract
In this investigation, high-resolution, 1x1x1-mm(3) functional magnetic resonance imaging (fMRI) at 7 T is performed using a multichannel array head coil and a surface coil approach. Scan geometry was optimized for each coil separately to exploit the strengths of both coils. Acquisitions with the surface coil focused on partial brain coverage, while whole-brain coverage fMRI experiments were performed with the array head coil. BOLD sensitivity in the occipital lobe was found to be higher with the surface coil than with the head array, suggesting that restriction of signal detection to the area of interest may be beneficial for localized activation studies. Performing independent component analysis (ICA) decomposition of the fMRI data, we consistently detected BOLD signal changes and resting state networks. In the surface coil data, a small negative BOLD response could be detected in these resting state network areas. Also in the data acquired with the surface coil, two distinct components of the positive BOLD signal were consistently observed. These two components were tentatively assigned to tissue and venous signal changes.
Keywords
Brain/anatomy & histology, Brain/physiology, Brain Mapping/instrumentation, Brain Mapping/methods, Computer-Aided Design, Equipment Design, Equipment Failure Analysis, Evoked Potentials/physiology, Humans, Image Enhancement/instrumentation, Magnetic Resonance Imaging/instrumentation, Magnetic Resonance Imaging/methods, Magnetics/instrumentation, Radio Waves, Reproducibility of Results, Sensitivity and Specificity, Transducers
Pubmed
Web of science
Create date
04/08/2010 15:28
Last modification date
20/08/2019 15:52
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