In digital mammography, image resolution is controlled by which factor?

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Spatial resolution is determined by how finely the image is sampled, which depends on the number of pixels in the image matrix. More pixels across the same field of view mean smaller sampling elements, so finer details can be recorded and the image appears sharper. Brightness and grayscale levels affect the image’s appearance and contrast, not the level of spatial detail. Exposure time influences noise and patient dose, not how closely we can sample small structures. Grayscale levels relate to how many tonal steps the system can distinguish, affecting contrast resolution rather than the ability to resolve small features. So, the factor that controls image resolution is the number of pixels in the image matrix.