After X-ray exposure, what state does the photostimulable phosphor on an imaging plate enter?

After X-ray exposure, what state does the photostimulable phosphor on an imaging plate enter?

• A. Excited and remains so until processed
• B. Returns to ground state immediately
• C. Emits light and forms image instantly
• D. Is permanently altered until discarded

Answer: (A)

Photostimulable phosphor stores energy after X-ray exposure by trapping electrons in metastable states within the crystal. This places the plate in an excited, stored state—the latent image is held there until the plate is read. During readout, a laser stimulates the traps, releasing the trapped energy as light to form the image. The excited/trapped state is not permanent or immediate emission, and the plate can be erased and reused after proper processing.

Photostimulable phosphor stores energy after X-ray exposure by trapping electrons in metastable states within the crystal. This places the plate in an excited, stored state—the latent image is held there until the plate is read. During readout, a laser stimulates the traps, releasing the trapped energy as light to form the image. The excited/trapped state is not permanent or immediate emission, and the plate can be erased and reused after proper processing.