Abstract #0493
Direct calculation of B1 + and B1 - from two point variable flip angle data for quantitative T1 and PD mapping
Simon Baudrexel 1,2 , Ulrike Noeth 2 , Sarah Reitz 1,2 , Johannes Christian Klein 1,2 , and Ralf Deichmann 2
1
Department of Neurology, Goethe University
Frankfurt, Frankfurt am Main, Germany,
2
Brain
Imaging Center (BIC), Goethe University Frankfurt,
Frankfurt am Main, Germany
A technique for direct calculation of the transmitted
radio frequency (RF) field (B1
+
) and the
receiver sensitivity profile (B1
-
) is
presented which is based on the acquisition of a
standard spoiled gradient echo sequence using two
different flip angles (i.e. the variable flip angle
method, VFA) without requiring any further measurements.
In a sample of 12 healthy subjects, B1
+
and
B1
-
maps
obtained with the new method were compared with
respective maps based on existing techniques, yielding
very good agreement throughout the brain with an average
absolute deviation of 3%.
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