Which factor affects spatial resolution in computed tomography?

Spatial resolution in computed tomography refers to the system's ability to distinguish between two closely spaced objects. One of the key factors that influence this capability is the size of the detector elements. Smaller detector elements allow for finer detail capture, resulting in clearer images with higher spatial resolution. This is because smaller detectors can sample more data points within a given area, which contributes to the clarity and detail of the images produced.

In contrast, while the total scan duration may influence the overall quality and noise level of the image, it does not directly affect spatial resolution. The software's processing power can enhance image reconstruction and improvement algorithms but is not a fundamental factor in the resolution itself. Likewise, the number of slices scanned relates more to the volume of information obtained rather than the spatial resolution of each individual slice. Thus, the size of the detector elements is the primary factor that directly impacts spatial resolution in CT imaging.