Abstract #3193
RF pulse designs for MPRAGE at 9.4T
Desmond Ho Yan Tse 1,2 , Daniel Brenner 3 , Johannes G Ramaekers 1 , Joachim E Wildberger 2 , and Benedikt A Poser 1
1
Faculty of Psychology and Neuroscience,
Maastricht University, Maastricht, Netherlands,
2
Department
of Radiology, Maastricht University Medical Centre,
Maastricht, Netherlands,
3
German
Centre for Neurodegenerative Diseases (DZNE), Bonn,
Germany
T1-weighted imaging with MPRAGE at 9.4T was improved by
using TR-FOCI for inversion and kt-points pulses for
excitation. Due to the higher inversion effectiveness of
TR-FOCI over hyperbolic secant at low B1+, uniform
inversion across the whole brain was achieved.
Meanwhile, the excitation inhomogeneity was reduced
across the whole brain by replacing the rectangular
excitation pulse in CP mode with a MLS optimised full
pTx kt-points composite pulse. The improvements from
these two modifications have led to reductions in
intensity variation due to transmit and contrast loss
due to in sufficient B1+ for inversion in the resulting
T1-weighted image.
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