In the Compton effect, a photon interacts with an outer shell electron, resulting in the ejection of the electron and a scattered photon with reduced energy.
Compton scatter is a significant contributor to image noise. It can result in scattered photons reaching the detector and degrading image contrast.
Compton scatter is more likely to occur with higher-energy photons, such as those around 140 keV.
The photoelectric effect is more pronounced at lower energies and is characterized by the complete absorption of a photon by an inner-shell electron, leading to the ejection of the electron.
The Photoelectric Effect is particularly important in medical imaging applications using low-energy X-rays, where it contributes to contrast in radiographic images.
Mnemonic: Compton is with COmpletely More energy PhoTONs (Compton scatter is more likely to occur with higher-energy photon)
photoeLEctric absorbs aLL Lower Energies
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