Abstract #2380
Optimal flip angle and signal shaping for single-shot volumetric DREAM B 1 mapping
Rdiger Stirnberg 1 , Daniel Brenner 1 , and Tony Stcker 1,2
1
German Center for Neurodegenerative Diseases
(DZNE), Bonn, Germany,
2
Department
of Physics and Astronomy, University of Bonn, Bonn,
Germany
The use of a unique steady-state flip angle for optimal
signal shaping in 3DREAM, a volumetric single-shot B
1
mapping
method, is investigated. While free-induction-decay
signals are shaped constantly when employing the
proposed flip angle, the predictable exponential decay
of stimulated echoes is shown to act as a 2D Gaussian
filter on the stimulated echo image due to a spiral-out
k-space view-ordering. This filter can be well estimated
and employed post-hoc to the free-induction-decay image
to equalize resolution properties. This is shown to
improve derived B
1
maps.
The findings are transferable to conventional,
slice-selective DREAM B
1
mapping.
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