Stephan Orzada1,2, Stefan Maderwald1,2, Oliver Kraff1,2, Irina Brote1,2, Mark E. Ladd1,2, Klaus Solbach3, Pedram Yazdanbakhsh3, Achim Bahr4, Hans-Peter Fautz5, Andreas K. Bitz1,2
1Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, NRW, Germany; 2Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, NRW, Germany; 3High Frequency Engineering, University Duisburg-Essen, Duisburg, NRW, Germany; 4IMST GmbH, Kamp-Lintfort, Germany; 5Siemens Healthcare Sector, Erlangen, Germany
To increase the capability of a 7 Tesla 8-channel RF shimming system, a 16-channel Tx/Rx body coil was built to be used with a 16-channel Butler matrix for mode compression and an 8-channel variable power combiner. The array has a large field of view and shows good homogeneity in gradient echo images. RF shimming with mode compression and variable power combining was successfully performed in human volunteers.