Abstract #1642
Reception sensitivity inhomogeneity correction at ultra high field using a fast gradient echo sequence
Franck Mauconduit 1 , Aurlien Massire 2 , Nicolas Boulant 2 , Alexis Amadon 2 , and Alexandre Vignaud 2
1
Siemens Heathcare, Saint Denis, France,
2
CEA,
DSV, I2BM, Neurospin, LRMN, Gif-Sur-Yvette, Ile de
france, France
UHF suffers from significant inhomogeneity artifacts
originating from transmission RF and reception
sensitivity coils. In vivo measurement approaches have
been proposed earlier. Based on these approaches, we
suggest a very short TR GRE sequence to reduce image
unihomogeneity. On a Siemens 7T Magnetom scanner, a B1
field map (AFI) and a GRE sequence with minimal tissue
contrast are acquired. Then the GRE sequence is low pass
filtered and a post processing corrects reception
sensitivities on an MPRAGE acquisition. Our result shows
a significant improvement using a GRE sequence with TR=9ms
and 10 sec acquisition therefore providing a fast
correction method.
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