What happens when a computed radiography (CR) imaging plate is exposed to white light?

• A. The imaging plate is completely exposed and cannot be used
• B. The imaging plate is erased and can be reused
• C. The imaging plate is never exposed to white light, only x-rays
• D. White light has no effect on the imaging plate

Answer: (B)

When a CR imaging plate has stored a latent image from x-rays, it sits with trapped electrons in the photostimulable phosphor. Exposing that plate to white light provides photons that release those trapped electrons, causing the stored energy to dissipate and the latent image to disappear. In other words, the white light erases the image, and the plate becomes blank but still usable after being re-exposed to x-rays and read again. This is why handlingCR plates requires light-controlled conditions—the erasure means you lose the previous image, and you’d need to retake if that data was needed. White light does affect the plate, so stating that it has no effect isn’t accurate, and the plate is not permanently damaged—it's simply reset and ready for reuse.