Which factor can cause a region of decreased exposure across the plate after processing?

• A. Plate uniformity
• B. Kilovoltage accuracy
• C. Spatial resolution
• D. Ambient lighting

Answer: (A)

Plate uniformity is about how consistently the PSP plate responds across its surface. If the plate has regions with different sensitivity, the same X-ray dose can produce different amounts of signal in different areas. After processing, those areas show up as patches of decreased exposure because the latent image wasn’t recorded equally across the plate. The other factors affect different aspects: kilovoltage accuracy changes the overall beam energy and the image’s overall density/contrast, not a specific region; spatial resolution affects how sharp or detailed the image is, not how much exposure is recorded in a particular spot; ambient lighting doesn’t influence the processed plate in radiographic systems.