Which aspects of the image receptor influence spatial resolution?

Which aspects of the image receptor influence spatial resolution?

• A. Size, pitch, & number of detector elements (dexels)
• B. Exposure time
• C. Screen brightness
• D. Film speed

Answer: (A)

Spatial resolution depends on how finely the image receptor can sample the scene. The receptor is built from detector elements, each called a dexel, that record the signal over a small area. If these elements are large, each sample covers more area and fine details get averaged out, reducing resolution. Making the detector elements smaller and packing them closer together (a smaller pitch) increases how many samples fit in a given area, which captures finer details and boosts resolution. The more detector elements across the image, the more samples you have and the higher the potential resolution. Exposure time mainly affects motion blur and patient dose, not how the receptor samples the image. Screen brightness is about display, not the sampling grid. Film speed influences sensitivity and noise in film-based systems (and can affect perceived sharpness), but it doesn’t change the receptor’s sampling geometry in digital terms.

Spatial resolution depends on how finely the image receptor can sample the scene. The receptor is built from detector elements, each called a dexel, that record the signal over a small area. If these elements are large, each sample covers more area and fine details get averaged out, reducing resolution. Making the detector elements smaller and packing them closer together (a smaller pitch) increases how many samples fit in a given area, which captures finer details and boosts resolution. The more detector elements across the image, the more samples you have and the higher the potential resolution.

Exposure time mainly affects motion blur and patient dose, not how the receptor samples the image. Screen brightness is about display, not the sampling grid. Film speed influences sensitivity and noise in film-based systems (and can affect perceived sharpness), but it doesn’t change the receptor’s sampling geometry in digital terms.