PolyVox can indeed convert voxels to a polygon mesh (that is its main purpose) but it is not an all-in-one solution. That is, PolyVox is not an application which you can just run, but is instead a library which a programmer could use to create the application you want.
If you have access to a C++/graphics programmer then he/she could write a program to:
- Read the images into a PolyVox volume.
- Run a PolyVox surface extractor.
- Convert the resulting mesh to the required format.
If you don't have acess to a programmer then you probably can't use PolyVox. There are plenty of other pieces of voxel software out there you could
start here but I don't know whether any of them do exactly what you want.