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

In CT imaging, various factors contribute to image noise, which can significantly impact image quality. While calibration of the imager is an essential aspect of ensuring accurate measurements, it does not directly influence the noise present in the images produced during a scan.

Patient movement during scanning can introduce blurring and affect image consistency, thereby increasing noise. Table speed during scanning can impact the amount of data collected within a given timeframe, affecting the signal-to-noise ratio. Likewise, field of view settings influence the amount of anatomy being scanned and can also result in varying levels of noise based on how much scatter and patient size come into play.

In contrast, the calibration of the imager ensures that the system is functioning accurately and that pixels are reading the correct values; however, it does not inherently change the noise characteristics during the scanning process itself. Thus, the calibration does not directly relate to the variability of image noise that might occur with different scanning parameters or patient conditions.