What is the role of phosphor storage plates in digital radiography?

• A. They directly convert X-rays to digital signals.
• B. They are used to capture color images.
• C. They are a type of film-based system.
• D. They store latent images until scanned.

Answer: (D)

Phosphor storage plates store latent images until scanned. When X-rays expose the plate, the phosphor crystals trap some of the energy, creating a latent image that isn’t visible yet. Later, a laser reader stimulates the trapped energy, and the released light is captured and converted into a digital signal to form the radiograph. This storage-and-readout process is what makes the plate effective in digital radiography.

Why not the other ideas: they don’t describe this storage-before-readout role. The plates don’t directly convert X-rays to digital signals (that would be direct digital radiography). The images are not produced as color photos in this context, and the system isn’t film-based.