Metal artifacts on a CT image are categorized as which type of artifact?

Metal artifacts on a CT image are categorized as beam hardening artifacts. This phenomenon occurs when X-ray beams pass through dense materials such as metal, which leads to a preferential filtering of lower energy X-rays. As the X-rays traverse the metal, the beams lose energy, resulting in non-uniformity in the intensities detected by the CT sensors. This can create dark streaks or bands in the image, compromising the quality and accuracy of the diagnostic information.

Understanding beam hardening is crucial for interpreting CT images correctly, especially in cases where implants, dental work, or any metallic structure is present within the scanned area. Recognizing and managing these artifacts is essential for ensuring optimal image quality and accurate diagnosis in CT imaging.