2D-segmented, multi-TE 3D-EPI for high-resolution R 2 * and quantitative susceptibility mapping at 7 Tesla
Rdiger Stirnberg 1 , Julio Acosta-Cabronero 2 , Benedikt A. Poser 3 , and Tony Stcker 1,4
German Center for Neurodegenerative Diseases
(DZNE), Bonn, Germany,
Center for Neurodegenerative Diseases (DZNE), Magdeburg,
of Psychology and Neuroscience, Maastricht University,
of Physics and Astronomy, University of Bonn, Bonn,
Recently, the feasibility of quantitative susceptibility
mapping (QSM) at 3 Tesla using segmented 3D-EPI
requiring only a fraction of conventional gradient echo
(GRE) acquisition times, has been demonstrated. Moving
to higher field strengths usually involves higher
spatial resolutions and shorter echo times. The use of
additional in-plane segmentation in 3D-EPI is proposed
here to meet both requirements at 7 Tesla. Multiple R
weightings further increase the sequence flexibility.
QSM results at 0.8mm in-plane resolution show that more
than one EPI average is hardly needed when compared to
GRE. More advanced applications, such as susceptibility
tensor imaging, thus become feasible.
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