Computed Tomography Technologist Practice Exam 2025 – All-in-One Guide for Exam Success!

Stair-step artifacts in imaging primarily occur due to the use of wide slices, particularly in computed tomography (CT). When wide slices are used, the interpolation of data between the slices can lead to a loss of detail, resulting in abrupt transitions or "steps" in the image. This phenomenon is especially noticeable in areas with a complex anatomy, where a gradual change should exist.

In contrast, narrow slices allow for better representation of anatomical structures and smoother transitions, reducing the likelihood of such artifacts. High patient motion can contribute to degradation in image quality and obscure the anatomy, but it does not specifically lead to stair-step artifacts. Image resolution relates to the sharpness or detail in the imaging, but it does not directly cause stair-step effects; rather, it is influenced by the slice thickness and other scanning parameters. Hence, the use of wide slices is a significant factor in the emergence of stair-step artifacts, making it the correct answer in this context.