Abstract #0521

Fast multi-slice B1 and B0 mapping (B01TIAMO) for 32-channel pTx body MRI at 7 Tesla

Sascha Brunheim^1,2, Sören Johst¹, Stephan Orzada¹, Jose P Marques³, Marcel Gratz^1,2, Mark E Ladd^1,4, and Harald H Quick^1,2

¹Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Essen, Germany, ²High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany, ³Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Nijmegen, Netherlands, ⁴Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany

The aim of this work was to improve the recently developed B1TIAMO method at ultra-high magnetic field for a 32-channel body transceiver array by providing complete information about both the B0 and B1+ distribution within the human abdomen without movement artifacts by breathing. Therefore, a fast multi-slice version including two-echo B0 maps with time interleaved acquisition of modes (B01TIAMO) was introduced. Furthermore, B1+ phase calculation was improved by geometric-decomposition coil compression, resulting in accurate single-channel B1+ and B0 maps for three different slices within only 21s versus the 42s step-by-step measurement for a single slice with normal B1TIAMO.

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