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

Overscan in 4th generation CT units provided the advantage of reduced motion artifacts. This technique involved acquiring more data than what was needed for reconstruction of a single slice. By overscanning, the system could capture additional information beyond the boundaries of the intended slice. As a result, if there was any motion during the scan—such as patient movement or organ motion—those artifacts could be minimized during the reconstruction process due to the extra data available. Essentially, the overscan created a buffer of information that helped to ensure smoother and more accurate images, particularly in situations where motion could have otherwise compromised image quality.

In contrast, while other options like increased image resolution, faster scan times, and better contrast resolution are noted advancements in CT technology, they were not direct advantages provided specifically by the overscan technique in 4th generation systems.