Why is there a time limit for PSP images?

• A. Image quality decreases
• B. Scanner calibration required
• C. Battery life limits
• D. Storage space constraints

Answer: (A)

Photostimulable phosphor plates store the exposed image as a latent signal in the phosphor crystals, and that stored energy gradually fades over time. If you wait too long to read the plate, the latent image decays, increasing noise and reducing contrast and detail. That fading is why a time window is specified for processing PSP images—it helps ensure the resulting image maintains diagnostic quality.

Other factors like scanner calibration, battery life, or storage capacity aren’t what the time limit is about; they matter in different ways, but they don’t explain why delaying processing degrades image quality.