In a fixed field of view, increasing matrix size from 512x512 to 2048x2048 results in what?

• A. Larger pixel size
• B. Smaller pixel size
• C. Higher dynamic range
• D. Lower spatial resolution

Answer: (B)

When the field of view is fixed, pixel size depends on how many pixels you have in the detector. Pixel size equals the field of view divided by the matrix size. Increasing the matrix from 512×512 to 2048×2048 packs four times as many pixels across each dimension, so each pixel covers a smaller area—pixel size becomes smaller. This finer sampling lets you represent details more accurately, which means better spatial resolution. Dynamic range comes from the system’s bit depth, not the matrix size, and larger pixel size would occur if you had a smaller matrix, not a larger one.