Beam hardening is a phenomenon in which when a continuous X-ray spectrum (X-rays with broad energy/spectrum) passes through a material, more low-energy X-rays are absorbed, and the ratio of high-energy X-rays increases. (Beam hardening = hardening of the radiation quality)
Beam hardening is a type of artifact that appears in CT images. Beam hardening causes materials of uniform density to appear as materials of different densities in CT images.
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