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Abstract #4720

Comparison of Simulation-Based and Measurement-Based RF Shimming for Whole-Body MRI at 7 Tesla

Andreas K. Bitz1,2, Irina Brote1,2, Stephan Orzada1,2, Oliver Kraff1,2, Stefan Maderwald1,2, Harald H. Quick3, Klaus Solbach4, Achim Bahr5, Hans-Peter Fautz6, Franz Schmitt6, Mark E. Ladd1,2

1Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany; 2Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany; 3Institute for Medical Physics, Friedrich-Alexander-University, Erlangen-Nuernberg, Germany; 4High Frequency Technique, University Duisburg-Essen, Duisburg, Germany; 5IMST GmbH, Kamp-Lintfort, Germany; 6Siemens Healthcare Sector, Erlangen, Germany

The aim of this study was to compare RF shimming procedures based on RF simulations and measured B1+ maps for different ROIs in the thorax and abdomen of volunteers with varying physique. Simulation-based RF shims were computed by use of heterogeneous body models. In vivo B1+ mapping was performed during breath hold by utilization of a pre-saturation turboFLASH. ROIs in the heart, liver, and kidney were considered. Appropriate simulation-based shims could be derived which function in the majority of considered volunteers. If the numerical body model inadequately describes the subjects body, measured shims should be preferred to achieve higher image quality.