Abstract #4941

In-vivo 7T body MRI with complete abdominal coverage using pTx and a 32-Tx-channel whole-body RF antenna array

Johannes A. Grimm^1,2, Christoph S. Aigner³, Constantin Schorling¹, Sebastian Dietrich³, Stephan Orzada¹, Thomas M. Fiedler¹, Mark E. Ladd^1,2,4, and Sebastian Schmitter^1,3,5

¹Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, ²Faculty of Physics and Astronomy, Heidelberg University, Heidelberg, Germany, ³Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany, ⁴Faculty of Medicine, Heidelberg University, Heidelberg, Germany, ⁵Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States

Synopsis

Keywords: High-Field MRI, Parallel Transmit & Multiband, whole-body, abdomen, kT-points, free-breathing, 3D, RPE acquisition

Motivation: Flip angle variations or voids are problematic at 7T, especially when large fields of excitation are needed, such as for the entire abdomen.

Goal(s): To homogeneously excite the whole abdomen using dynamic pTx and to investigate the minimal number of kT-points necessary.

Approach: Dynamic pTx is applied in the abdomen using a 32-Tx-channel whole-body array and free-breathing relative B₁⁺ mapping.

Results: The preliminary data indicates that exciting the whole abdomen is feasible and that dynamic pTx yields sufficient FA homogeneity in all subjects.

Impact: The preliminary data indicates that exciting the whole abdomen is feasible and that dynamic pTx yields sufficient FA homogeneity in all subjects.

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