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
Department of Neurology, Goethe University
Frankfurt, Frankfurt am Main, Germany,
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
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
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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