Which of the following is a factor that affects spatial resolution in CT scans?

Spatial resolution in CT scans refers to the ability to distinguish small structures and the clarity of images produced. The focal spot size (FSS) is a critical factor affecting spatial resolution because it pertains to the size of the X-ray source's focal spot. A smaller focal spot allows for better resolution of fine details in the image, as it produces a more precise and concentrated X-ray beam. This precision enhances the capability to differentiate between closely spaced structures within the scanned area.

While image reconstruction methods, tube voltage settings, and patient motion can influence image quality in various ways, they do not directly relate to the spatial resolution in the same manner as focal spot size does. For instance, larger focal spots may lead to blurriness and reduced clarity. Therefore, the influence of focal spot size on sharpness and detail in the final image makes it a significant determinant of spatial resolution in CT imaging.