ABSTRACT
Scattered photons are one of the main sources of image degradation in industrial X-ray computed tomography (CT). X-rays travelling through matter can undergo several different physical interactions. The four main interactions of X-rays in matter are the photoelectric effect, Rayleigh scattering, Compton scattering, and pair production. In typical X-ray CT context, the electron involved in a Compton scattering event is typically a lightly bound electron of an atom. Compton interactions lead to the deflection of the incident photon, accompanied by a transfer of a part of the energy of the photon to the recoil electron. In contrast to the Compton interaction, Rayleigh scattering can be described as an elastic scattering event, because the energy of the interacting photon doesn't change. The measurement of X-ray scatter by beam-stop array artificially introduces the X-ray scatter measurement points by placing a set of high-attenuating media in front of the detector.
