Young Investigator Award Finalist: B0 and B1 Correction Using the Inherent Degrees of Freedom of a Multi-Channel Transmit Array

Jeremiah Aaron Heilman¹, Jamal J. Derakhshan¹, Matthew J. Riffe¹, Natalia Gudino¹, Jean Tkach¹, Christopher A. Flask¹, Jeffrey L. Duerk¹, Mark A. Griswold¹

We present methods that capitalize on the inherent degrees of freedom in a mutli-channel transmission array to correct the effects of B0 and B1 variations within the context standard slice selective and chemically selective pulses. A new method called Parallel excitAtion for B-field insensitive fat Saturation preparaTion (PABST) utilizes the frequency and amplitude freedom to improve uniformity and efficacy of CHESS pulse fat saturation in the presence of off-resonance without increasing the length of the pulse or requiring iterative optimization. A similar technique, utilizing phase and amplitude freedoms to tailor the axis of rotation across the FOV, can correct for off-resonance effects in TrueFISP and potentially eliminate banding.