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

The third module of the ACR CT accreditation phantom specifically assesses CT number uniformity and in-plane distance measurements. This module is critical for evaluating how consistently the computed tomography system can produce standard CT values (Hounsfield units) across different areas of the imaging field and for verifying the accuracy of distance measurements within the plane of the images.

In clinical practice, CT number uniformity is essential for ensuring diagnostic accuracy, as variations can indicate issues with calibration or technical aspects of the imaging process. Consistent measurements are necessary to compare imaging results over time and to correlate imaging findings with actual anatomical structures.

The assessment of in-plane distance measurements is also vital, as it tests the scanner's ability to accurately represent distances between structures within the same slice. This is crucial for planning treatments, such as radiation therapy, where precision in measurements can significantly impact patient outcomes.

Thus, this module effectively ensures that the CT scanner meets quality standards necessary for producing reliable diagnostic information.