Frequency-selective pTx pulses for 3D echo planar imaging at ultra-high field
Arun Joseph1,2,3, Patrick Liebig4, Gabriele Bonanno1,2,3, Jin Jin5,6, Kurt Majewski7, Tobias Kober8,9,10, and Tom Hilbert8,9,10
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
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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