As a rule, any object that can be completely penetrated by radiation, in any direction perpendicular to the axis of rotation, can be inspected using Computed Tomography, provided its diameter does not exceed the size of the effective detector area. Is the sample diameter larger than the effective detector, then the sample cannot be viewed in its entirety on the monitor.
Resolution V in the X-ray tomographic image equals the voxel size of the reconstructed volume data set and is defined as detector pixel size (P) divided by geometric magnification M: V=P/M.
M is defined as the ratio of focus-detector-distance to focus-object-distance: M= FDD/FOD. Parameters affecting geometric magnification are sample diameter and size of the effective detector surface D: Mmax = D/d (see above). The smallest voxel size possible, and therefore the best resolution obtainable, is defined as V=Pd/D. For small objects, very high magnifications can be obtained, making the size of the radiation source, F, the only limiting factor for geometric magnification.