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Boosting BOLD fMRI by K-Space Density Weighted Echo Planar Imaging

Please always quote using this URN: urn:nbn:de:bvb:20-opus-97233
  • Functional magnetic resonance imaging (fMRI) has become a powerful and influential method to non-invasively study neuronal brain activity. For this purpose, the blood oxygenation level-dependent (BOLD) effect is most widely used. T2* weighted echo planar imaging (EPI) is BOLD sensitive and the prevailing fMRI acquisition technique. Here, we present an alternative to its standard Cartesian recordings, i.e. k-space density weighted EPI, which is expected to increase the signal-to-noise ratio in fMRI data. Based on in vitro and in vivo pilotFunctional magnetic resonance imaging (fMRI) has become a powerful and influential method to non-invasively study neuronal brain activity. For this purpose, the blood oxygenation level-dependent (BOLD) effect is most widely used. T2* weighted echo planar imaging (EPI) is BOLD sensitive and the prevailing fMRI acquisition technique. Here, we present an alternative to its standard Cartesian recordings, i.e. k-space density weighted EPI, which is expected to increase the signal-to-noise ratio in fMRI data. Based on in vitro and in vivo pilot measurements, we show that fMRI by k-space density weighted EPI is feasible and that this new acquisition technique in fact boosted spatial and temporal SNR as well as the detection of local fMRI activations. Spatial resolution, spatial response function and echo time were identical for density weighted and conventional Cartesian EPI. The signal-to-noise ratio gain of density weighting can improve activation detection and has the potential to further increase the sensitivity of fMRI investigations.show moreshow less

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Metadaten
Author: Mario Zeller, Alexander Müller, Marcel Gutberlet, Thomas Nichols, Dietbert Hahn, Herbert Köstler, Andreas J. Bartsch
URN:urn:nbn:de:bvb:20-opus-97233
Document Type:Journal article
Faculties:Medizinische Fakultät / Institut für diagnostische und interventionelle Radiologie (Institut für Röntgendiagnostik)
Medizinische Fakultät / Klinik und Poliklinik für Strahlentherapie
Language:English
Parent Title (English):PLoS ONE
Year of Completion:2013
Source:In: PLoS ONE (2013) 8: 9, doi:10.1371/journal.pone.0074501
DOI:https://doi.org/10.1371/journal.pone.0074501
Sonstige beteiligte Institutionen:Comprehensive Heart Failure Center, University of Würzburg, Würzburg, Bavaria, Germany
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 61 Medizin und Gesundheit / 610 Medizin und Gesundheit
Tag:data acquisition; density; echo planar imaging; functional magnetic resonance imaging; imaging techniques; matched filters; signal filtering; statistical data
Release Date:2014/05/07
Collections:Open-Access-Publikationsfonds / Förderzeitraum 2013
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung