Abstract #4337
Ultra-fast B 1 + Mapping allows Speeding up RF Shimming in Body MRI at 3T
Alois Martin Sprinkart 1,2 , Georg Schmitz 2 , Frank Trber 1 , Wolfgang Block 1 , Jrgen Gieseke 3 , Hans Schild 1 , Peter Brnert 4,5 , and Kay Nehrke 4
1
Dept. of Radiology, University of Bonn,
Bonn, Germany,
2
Institute
of Medical Engineering, Ruhr-University Bochum, Bochum,
Germany,
3
Philips
Healthcare, Hamburg, Germany,
4
Philips
Research Laboratory, Hamburg, Germany,
5
Dept.
of Radiology, LUMC, Leiden, Netherlands
To test if the recently proposed ultra-fast B
1
+
mapping
approach DREAM is applicable in clinical routine for
patient-adaptive radiofrequency(RF)-shimming in body MRI
at 3T, the performance of DREAM, double-angle (DA), and
actual-flip-angle (AFI) B
1
+
mapping
methods was compared in 10 volunteers. Therefore,
RF-shimsets obtained by DA-, AFI-, and DREAM- based B
1
+
calibration
data were analyzed by AFI- based B
1
+
mapping.
Results suggest that DREAM-based RF-shimming yields
similar results as DA and AFI with respect to both, flip
angle accuracy and B
1
+
homogeneity,
while the total acquisition time of the calibration
sequence is shortened from one or two long breath-holds
to about 1 second when DREAM is applied.
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