Motion-insensitive sequence for single-voxel determination of B 1 + by Bloch-Siegert shift in moving organs including the human heart
Ayse Sila Dokumaci 1 , Bertrand Pouymayou 1 , Roland Kreis 1 , and Chris Boesch 1
Depts. Radiology and Clinical Research,
University Bern, Bern, Switzerland
The determination of B1+ in moving organs, in particular
in the heart, is a largely unmet problem. Most B1+
mapping sequences are too long and/or cannot be acquired
in a (double-) triggered mode. We developed and
validated a single-voxel PRESS sequence based on the
Bloch-Siegert shift which is largely immune against
effects of motion and which can additionally be
double-triggered. Measurements in vitro and in the human
heart show an excellent performance of the sequence.
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