Pore size distributions may been measured with 1, 2 and 3-dimensional spatial resolution, using NMR cryoporometry in conjunction with standard magnetic resonance imaging techniques.
Nuclear Magnetic Resonance is here used both as a convenient technique for measuring the fraction that is liquid, deep inside the porous material, and as a way of spatially encoding the poresize density to produce a poresize distribution map.
In rocks, for example, the pore size in faulted regions is often less than in the bulk rock.