Which artifact is specifically referred to as "step artifact" in imaging?

The term "step artifact" refers specifically to the loss of sharpness from individual sections in imaging. This phenomenon occurs due to the way images are reconstructed from discrete slices during the CT scanning process. When imaging is done in sections or slices, if there is a change in density or attenuation across those slices (such as in areas with rapid changes in tissue type, like the interface between air and soft tissue), the reconstructed image may show visible steps or edges rather than a smooth transition. This results in a blocky appearance that reduces the overall sharpness and can negatively impact diagnostic quality.

Understanding this concept is critical for improving image quality and ensuring accurate diagnoses. Awareness of how various reconstruction algorithms and settings can influence step artifacts encourages better technique and optimization during the imaging process.