CA Imaging methods are increasingly being applied to a wide range of applications that include clinical medicine, geophysics, remote sensing, and materials testing.
Sources can be magnetic, acoustic, electrical, or electromagnetic in origin.
These may be located external to the medium or inside. Detection modes may or may not be time dependent and can range from backscatter only to full tomographic measurement schemes. A common feature complicating many of these methods is the uncertainty regarding the volume of medium probed by the penetrating or emitted energy. Frequently, this uncertainty is due to the effects of scattering. Accurate knowledge of the energy distribution requires information about the medium, which is the unknown being examined.