Abstract #3764
Highly dynamic k T -points to minimize the B 1 + inhomogeneity effects in T 2 -weighted imaging at 7T
Florent Eggenschwiler 1 , Kieran R. O'Brien 2 , Daniel Gallichan 1 , Rolf Gruetter 1,2 , and Jose P. Marques 3
1
Laboratory for Functional and Metabolic
Imaging, Ecole Polytechnique Fdrale de Lausanne,
Lausanne, Vaud, Switzerland,
2
Department
of Radiology, University of Geneva, Geneva, Geneva,
Switzerland,
3
Department
of Radiology, University of Lausanne, Lausanne, Vaud,
Switzerland
At ultra-high magnetic field, the inhomogeneous
distribution of the B
1
+
field
can significantly impair the quality of turbo spin echo
sequences. Static k
T
-points where a unique
pulse is designed in the STA regime and then dynamic k
T
-points
where a specific k
T
-point pulse is optimized
for each pulse of the turbo spin echo sequence were
proposed to generate T
2
-weighted images with
increasingly improved signal and contrast homogeneities.
In this work, the dynamic k
T
-point design is
further improved by allowing an increased flexibility
for the optimization of the excitation pulse and by
choosing carefully the cost function used in the
optimization algorithm.
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