  Standard coils can cause inhomogeneities due to the standing wave patterns at
ultra high field MRI. This B1 inhomogeneity can be overcome using the
travelling-wave MRI (twMRI) approach. The ma- jority of twMRI research has been
done with clinical MRI scanners at 7T or above. More recently, this concept has
been also used with animal MRI systems, using circular-cross section waveguides
and dielectric materials for both type of scanners. We have demonstrated that
twMRI can be used at 3 T with clinical systems and a parallel-plate waveguide.
Here, we investigated the use of a parallel- plate waveguide and a RF circular
coil to generate rat images with an animal MRI at 9.4 T.
