Comparison of Local and Remote Transmit Arrays for Body Imaging at 7T under Power and Local SAR Constraints
Martina Flser 1,2 , Andreas K. Bitz 1 , Stephan Orzada 2 , Klaus Solbach 3 , and Mark E. Ladd 1,2
Medical Physics in Radiology, German Cancer
Research Center (DKFZ), Heidelberg, Germany,
L. Hahn Institute for MRI, University Duisburg-Essen,
Frequency Engineering, University Duisburg-Essen,
So far, local coil arrays that are placed directly on
the subject are most commonly used for body imaging at
7T. Placing the coil array under the bore liner would
simplify the workflow and increase subject comfort.
Therefore, we compare the performance of several local
and remote body coil arrays under power and local SAR
constraints in simulations. While tight-fitting coil
arrays perform better in axial slices, remote arrays
achieve better B
in coronal and sagittal slices. Arranging the coil
elements in multiple rings can be beneficial for B
but is power and SAR demanding.
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