David Otto Brunner1, Jan Paska2,
Ingmar Graesslin3, Jrg Froehlich2, Klaas Paul
Pruessmann1
1Institute for Biomedical Engineering,
University and ETH Zurich, Zurich, Switzerland; 2Electromagnetic
Fields and Microwave Laboratory, ETH Zurich, Zurich, Switzerland; 3Philips
Research Europe, Hamburg, Germany
Since
the sample becomes considerably larger than the wavelength in human ultra
high field MRI, the electrodynamic degrees of freedom within the loaded bore
increases. Using a mode selectively fed waveguide section coupling into the
loaded bore it is demonstrated that parallel imaging techniques in
transmission and reception such as RF shimming and SENSE can be applied in a
travelling wave approach in the absence of a RF array coil close by the
object. A direct dependence between the parallel imaging performance of this
8 channel system and the number of modes in the waveguide could be shown.