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Abstract #4218

Improving the Inversion Efficiency in Regions of Low γB1 for Whole Brain Acquisitions

MAGNA25Kieran O'Brien1, 2, Jean Delacoste1, Jose Marques1, Tobias Kober3, Francois Lazeyras2, Rolf Gruetter1, Gunnar Krueger3

1LIFMET-CIBM, Ecole Polytechnique Fdral de Lausanne, Lausanne, Switzerland; 2Department of Radiology-CIBM, Universit de Genve, Geneva, Switzerland; 3Advanced Clinical Imaging Technology, Siemens Suisse, Switzerland

In whole brain acquisitions, such as MP2RAGE, large ΔB0 offsets or regions of low γB1 can suffer from poor inversion. Optimisation of adiabatic pulses to work at lower γB1, allows for better inversion profiles extending the coverage of whole brain acquisitions.

Keywords

ability able achieve acquisition acquisitions actual addition additionally adiabatic agreement amplitudes applied arrow assumed band bandwidth behave best better biomedical black body bottom brain canals cavities central cerebellum challenge channel clinical close coil complete condition contrast corpus corrected cost cover coverage default defined depiction described designed desired double duration efficiency either enables ensure envelopes examples experience experiences fails free frequencies frequency fully function genetic good gradient greater head identified implementing improve improvement improves improving incomplete increasing inhomogeneities inhomogeneity inversion invert inverted like located magnitude majority manually maps marques matched matrix minimize much near offset offsets optimization optimized orbital orientations particularly peak power prepared profiles prone proposed pulse pulses radiology rage rapid recently recovery repeat represents required respectively ringing scanner secant sector sharp similarly simulated simulation sinus slice spins still structure struggles subj subject subjects sufficient sweep table technology theses transmit tune twice typical ultrahigh underlying underwent uniform various vast volume whole