What's the best software for excluding parts of a model bone

I am endevouring to convert CT scan of patient's bone into a print. I have used 3Dslicer to go from Dicom to .stl but I still have part of the supporting plate included in the model

I tried to use mesher to remove the part that I do not want but it will not select a part and then freezes (using w7 64 bit 16Gb Ram)

Here is a screenshot of what I have viewed in Mesher (please click to enlarge)
http://i246.photobucket.com/albums/g...6-15083427.png

Thanks

Geomagic Wrap is great for this sort of thing; as well as being able to select and delete parts of a STL file, it has a "Mesh Doctor" that can refine the meshes, find non-manifold polygons and fix them, correct overlapping polygons, fill tiny holes, etc.

Andrew Werby
www.computersculpture.com