Abstract #2935

Frequency-selective pTx pulses for 3D echo planar imaging at ultra-high field

Arun Joseph^1,2,3, Patrick Liebig⁴, Gabriele Bonanno^1,2,3, Jin Jin^5,6, Kurt Majewski⁷, Tobias Kober^8,9,10, and Tom Hilbert^8,9,10

¹Advanced Clinical Imaging Technology, Siemens Healthcare AG, Bern, Switzerland, ²Translational Imaging Center, sitem-insel AG, Bern, Switzerland, ³Magnetic Resonance Methodology, Institute of Diagnostic and Interventional Neuroradiology, University of Bern, Bern, Switzerland, ⁴Siemens Healthcare GmbH, Erlangen, Germany, ⁵Siemens Healthcare Pty Ltd, Brisbane, Australia, ⁶ARC Training Centre for Innovation in Biomedical Imaging Technology, The University of Queensland, Brisbane, Australia, ⁷Siemens AG, Munich, Germany, ⁸Advanced Clinical Imaging Technology, Siemens Healthcare AG, Lausanne, Switzerland, ⁹Department of Radiology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland, ¹⁰LTS5, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland

Synopsis

Echo planar imaging is an important MR technique used for different applications in both structural and functional imaging. It is typically used with fat suppression to avoid phase inconsistencies induced by the chemical shift of the fat signal. pTx pulses are used to mitigate the B1⁺ bias field occurring at higher fields strengths; typical pTx pulses do however not suppress the fat signal. In this work, we designed a frequency-selective water excitation pTx pulse to be used in 3D EPI acquisitions, enabling homogenous, high-resolution whole-brain fat-free imaging at 7T.

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