In digital radiography, what is the effect of increasing matrix size on spatial resolution?

In digital radiography, what is the effect of increasing matrix size on spatial resolution?

• A. Increased spatial resolution
• B. Decreased spatial resolution
• C. No change in spatial resolution
• D. Higher image noise

Answer: (A)

Increasing the matrix size, with the same field of view, makes each pixel smaller. Smaller pixels sample the image more finely, so details can be distinguished more clearly, which raises spatial resolution. Real systems also have limits from the focal spot size and detector performance, so the improvement has practical boundaries. The other ideas don’t reflect this sampling-based effect—spatial resolution goes up with a larger matrix, while noise is a separate consideration and not the primary change in resolution.

Increasing the matrix size, with the same field of view, makes each pixel smaller. Smaller pixels sample the image more finely, so details can be distinguished more clearly, which raises spatial resolution. Real systems also have limits from the focal spot size and detector performance, so the improvement has practical boundaries. The other ideas don’t reflect this sampling-based effect—spatial resolution goes up with a larger matrix, while noise is a separate consideration and not the primary change in resolution.