X-ray CT glossary - Beam hardening artifact

X-ray CT glossary ► bit.ly/3UoKvV8
X-rays used in X-ray CT (computed tomography) measurements are often polychromatic and have an energy distribution. Because X-ray absorption rate depends on the X-ray energy as well as the material density, polychromatic X-rays' energy distribution shifts as they go through an object. Higher-energy X-rays (harder X-rays) survive better than lower-energy X-rays (softer X-rays). As a result, X-rays energy shifts towards the higher side, or X-rays "harden" after going through an object. This phenomenon is called beam hardening.
If you want to learn more about X-ray computed tomography, here is a brief introduction for you: bit.ly/3IntkKA
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