Abstract #0860
Comparison of New Element Designs For Combined RF-Shim Arrays at 7T
Simone Angela Winkler 1 , Jason P Stockmann 2 , Paul A Warr 3 , Boris Keil 2 , Lawrence L Wald 2,4 , and Brian K Rutt 1
1
Dept. of Radiology, Stanford University,
Stanford, CA, United States,
2
A.
A. Martinos Center for Biomedical Imaging, Massachusetts
General Hospital, Harvard Medical School, Charlestown,
Massachusetts, United States,
3
Department
of Electrical & Electronic Engineering, University of
Bristol, Clifton, United Kingdom,
4
Harvard-MIT
Health Sciences and Technology, Massachusetts Institute
of Technology, Cambridge, Massachusetts, United States
Combining RF and B0 shim functions into a single array
is an appealing approach which allows highly flexible
matrix B0 shimming while preserving closely fitting,
high channel count receive array elements. The standard
approach is to add chokes to bypass all loop capacitors
to allow the DC current to flow around the loop, but
this introduces additional loss, heating, RF field
perturbation, bulk and construction complexity. We
report on the analysis (by theory, simulation, and
experiment) of several new combined RF-shim element
designs, with particular focus on SNR performance. We
particularly investigated two new loop designs
concentric and coaxial types and compared these to the
standard chokes and RF-only loop types. We conclude that
both new loop types provide viable solutions for RF-shim
loop architectures at 7T.
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