X-Ray Tomography
Here is a recent review paper on X-ray tomography:
Baker,
D.R., Mancini, L., Polacci, M., Higgins, M.D., Gualda, G.A.R., Hill, R.J.,
Rivers, M.L., 2012. An introduction to the application of X-ray
microtomography to the three-dimensional study of igneous rocks. Lithos
148: 262-276. doi: 10.1016/j.lithos.2012.06.008
An older review in the magazine 'Elements'
Jerram,
D.A., Higgins, M.D., 2007. 3D analysis of rock textures: Quantifying
igneous microstructures. Elements, 3(4): 239-245
doi:10.2113/gselements.3.4.239