Computed Tomography Technologist Practice Exam 2026 - Free CT Technologist Practice Questions and Study Guide

Out-of-field artifacts manifest primarily as streaks on an image. This occurs due to structures or objects that are outside the selected scan field contributing to the overall image quality. Since computed tomography relies on precise measurements of attenuation from tissue within the designated scanning area, anything outside this area can introduce unwanted signals that disrupt the clarity of the image.

The streaks typically arise because the reconstructed image incorporates data from areas that should not be included in the analysis. These unwanted signals can distort the representation of structures within the proper field of view, leading to the characteristic appearance of streaking on the final image output. It is important for technologists to recognize this artifact as it can affect the interpretation of the scanned areas and may require adjustments to scanning techniques or parameters to mitigate its effects.