Which configuration yields the highest spatial resolution?

• A. Increased Pixel Size
• B. Increased Matrix Size
• C. Increased Contrast Resolution
• D. Increased Bit Depth

Answer: (B)

Spatial resolution is about how finely details in the image are sampled. In digital radiography, the size of each pixel determines how small a detail can be detected—the smaller the pixel, the finer the sampling of the anatomy. Pixel size depends on the field of view and the matrix size: for the same field of view, increasing the matrix size creates smaller pixels, which means the image samples the object more densely and can resolve finer details.

Increasing pixel size would blur small features because each pixel covers a larger area. Increasing contrast resolution improves the ability to distinguish different gray shades, not the ability to distinguish spatial detail. Increasing bit depth also affects gray levels, not how finely the image samples spatial structure.

Thus, increasing the matrix size yields the highest spatial resolution.