Computed Tomography Technologist Practice Exam

The selection of the SFOV, or Size Field of View, is crucial in computed tomography (CT) imaging as it significantly affects how many detector cells are activated during the scan. When a specific SFOV is chosen, it defines the area of the patient's anatomy that will be included in the image and thus determines the number of detector cells that will gather data for that selected region.

By influencing the total number of active detector cells, the SFOV selection also impacts factors such as image quality and radiation dose, but its primary role revolves around ensuring that the correct anatomical area is captured. Other selections related to the scan, such as slice thickness or scanning speed, do not relate directly to SFOV; those are determined by different settings within the CT machine. This illustrates why option B is the accurate response to what the selection of the SFOV determines.