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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