Abstract #1018

Universal pulses: a new concept for calibration-free parallel transmission

Vincent Gras¹, Alexandre Vignaud¹, Alexis Amadon¹, Denis Le Bihan¹, and Nicolas Boulant¹

¹Neurospin, CEA/DSV/I2BM, Gif-sur-Yvette, France

At ultra-high field, a drawback of parallel transmission to mitigate the RF inhomogeneity problem is the necessity to measure subject-specific field maps in order to return optimized RF pulses, thereby decreasing the time available for clinically-relevant scans. In this work, we investigate numerically and experimentally at 7T the design of "universal" kT-points pulses, which does not require the aforementioned calibration step but yet considerably improves excitation homogeneity compared to the standard circularly-polarized and RF shim modes. Such approach can simplify considerably the workflow of parallel transmission and render the potential of ultra-high field scanners more accessible to anyone in routine.

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