I have 200 2D images (slices) which represent a volume of a blood vessel (basically, a tube). The pixel size in each of the 2D images is 5 microns and the distance between the slices is 200 microns. How can I add slices such that, when viewing the volume, the voxels are approximately square (i.e. how to I add 40 new slices between each pair of the original slices?).