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Abstract #4306

Comparison of a 32-channel remote body coil for 7 Tesla with local and remote 8- and 16-channel transmit coil arrays

Thomas M. Fiedler1, Martina Flöser1, Stefan H. G. Rietsch2,3, Stephan Orzada2, Harald H. Quick2,3, Mark E. Ladd1,2, and Andreas K. Bitz1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, 3High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany

The RF shimming performance of a 32-channel remote body coil is compared to ideally and non-ideally decoupled local and remote arrays consisting of 8 and 16 channels by evaluation of the singular values as well as evaluation of the RF shimming performance in axial and coronal slices with L-curves. For high-field body imaging, multi-ring remote coil arrays provide high degrees of freedom for RF shimming and can achieve higher B1+ homogeneity, especially for coronal slices. However, to utilize the full RF shimming potential of remote multi-ring transmit arrays, high local SAR has to be taken into account during safety assessment.

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