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Abstract #0639

Revisiting RF Feedback Pulses: Encoding Image Contrast During Excitation

Tony Stcker1, Kaveh Vahedipour1, N. Jon Shah1, 2

1Institute of Neuroscience and Medicine - 4, Forschungszentrum Jlich, Jlich, Germany; 2JARA - Faculty of Medicine, RWTH Aachen University, Aachen, Germany

This work discusses multidimensional RF feedback pulses (FBP), which copy the received MRI signal(s) back to the RF transmit channel(s), taking advantage of transmit and receive reciprocity. Spatially selective FBP, which are accompanied by suitable gradient waveforms, have the property to recursively enhance image contrast, which is promising in several applications. The paper presents a theoretical description of FBP in the context of the small tip angle approximation, first experimental results, and numerical simulations of multiple transceivers FBP (parallel transmit), which are promising to shorten the pulse length.