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Abstract #1463

Shaped Saturation with RF Power Efficient 2D Spatially Selective Spiral Design in Parallel Transmission

Rainer Schneider 1,2 , Jens Haueisen 2 , and Josef Pfeuffer 1

1 MR Application Development, Siemens Healthcare, Erlangen, Bavaria, Germany, 2 Institute of Biomedical Engineering and Informatics, TU Ilmenau, Ilmenau, Thuringia, Germany

Shaped saturation human in-vivo experiments were realized for the first time on the basis of multidimensional spatially selective RF pulses in parallel transmission. For this purpose, a variable-density 2D spiral trajectory design was introduced, which offers inherent RF power efficiency by incorporating the a-priori information of the target pattern and available B1 magnitude. The design was evaluated in sagittal head and t-spine experiments, saturating different patterns at 3T. The proposed approach was shown to offer up to 32% improved spatial accuracy and saturation performance under given RF hardware and SAR constraints.

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