If you have trouble importing data of other manufacturers (TOSHIBA, VARIAN, BRUKER etc), we recommend converting your data to Nifti, and then to use the Nifti plugin to import your data. A nice Dicom to Nifti converter can be found at http://www.sph.sc.edu/comd/rorden/mricron/ by Chris Rorden.
If you don't succeed, please contact BrainVoyager support: support AT brainvoyager DOT com. It is very likely that your data can be imported or converted into a BrainVoyager readable format.