Which factor most directly influences the display monitor spatial resolution in a digital radiography system?

Which factor most directly influences the display monitor spatial resolution in a digital radiography system?

• A. Object-to-Image Distance (OID)
• B. Matrix Size
• C. Source-to-Object Distance (SOD)
• D. Cathode Filament

Answer: (B)

The display’s ability to show detail is determined by how finely the image is sampled into pixels, which is set by the image’s matrix size. For a given field of view, increasing the matrix size reduces each pixel’s size (pixel pitch), allowing smaller structures to be represented and resolved on the monitor. That direct control over the sampling grid is why matrix size most strongly influences display spatial resolution. Object-to-image distance and source-to-object distance affect magnification and geometric blur in the recorded image, and the cathode filament size affects focal-spot blur. These factors change how sharp the image is overall, but they don’t determine how finely the image is sampled for display—the matrix size does.

The display’s ability to show detail is determined by how finely the image is sampled into pixels, which is set by the image’s matrix size. For a given field of view, increasing the matrix size reduces each pixel’s size (pixel pitch), allowing smaller structures to be represented and resolved on the monitor. That direct control over the sampling grid is why matrix size most strongly influences display spatial resolution.

Object-to-image distance and source-to-object distance affect magnification and geometric blur in the recorded image, and the cathode filament size affects focal-spot blur. These factors change how sharp the image is overall, but they don’t determine how finely the image is sampled for display—the matrix size does.