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Abstract #3834

Tailored 3D RF pulses for g-factor reduction in phase-constrained simultaneous multislice imaging

Ádám Kettinger1,2, Stephan A. R. Kannengiesser3, Felix A. Breuer4, Zoltán Vidnyánszky1, and Martin Blaimer4

1Brain Imaging Centre, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary, 2Department of Nuclear Techniques, Budapest University of Technology and Economics, Budapest, Hungary, 3MR Application Predevelopment, Siemens Healthcare GmbH, Erlangen, Germany, 4Magnetic Resonance and X-ray Imaging Department, Fraunhofer Development Center X-ray Technology (EZRT), Würzburg, Germany

Simultaneous multislice imaging techniques are widely used to accelerate the acquisition process, however, non-ideal coil geometries can introduce noise enhancement. This effect can be reduced by using the virtual-conjugate-coil technique, in which case the g-factors will be dependent of the object background phase. It has been shown that an optimal phasemap exists that minimizes the g-factors. We have used 3D tailored RF pulses to approximate the optimal phase distribution in each simultaneously acquired slice to reduce the noise amplification in phantom and also in vivo. Our results imply that g-factors can be reduced significantly while flip angle homogeneity remains reasonable.

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