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Abstract #0935

Determination of Relative B1+ Sensitivities Using Accelerated Simultaneous Excitation with Multiple Transmit Channels and Controlled Aliasing

Iulius Dragonu1, Craig Buckley1, Peter Weale1, Matthew D Robson2, and Aaron T Hess2

1Siemens Healthcare Ltd, Frimley, Camberley, United Kingdom, 2University of Oxford Centre for Clinical Magnetic Resonance Research (OCMR), John Radcliffe Hospital, Headington, United Kingdom

Radiofrequency shimming with multiple channel excitation is a well established method to increase the transverse magnetic field homogeneity and reduce SAR at high magnetic field strength(7T). To harness the benefits of a parallel transmit system, the magnitude and relative phase of each transmit channel must be determined during a calibration scan. We propose a new strategy to accelerate the acquisition of such calibration images by simultaneously exciting several transmit channels and reconstructing the calibration images using the technique similar to simultaneous multi-slice acquisitions.

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