An imaging plate is coated with

An imaging plate is coated with

• A. Silicon detector
• B. Plastic film
• C. Photostimulable phosphor
• D. Cold cathode material

Answer: (C)

In computed radiography, the imaging plate uses a photostimulable phosphor coating to store the x-ray energy after exposure. This material traps electrons in metastable states when hit by x-rays, forming a latent image. When the plate is later scanned with a laser, those trapped electrons are released as light (photostimulated luminescence), and the emitted light is captured and converted into a digital image. The typical phosphor is europium-doped barium halide (for example BaFBr:Eu2+). The other options don’t fit because a silicon detector is used in direct/indirect digital flat-panel detectors, plastic film corresponds to traditional film-screen radiography, and cold cathode material refers to the x-ray tube cathode, not the imaging plate.

In computed radiography, the imaging plate uses a photostimulable phosphor coating to store the x-ray energy after exposure. This material traps electrons in metastable states when hit by x-rays, forming a latent image. When the plate is later scanned with a laser, those trapped electrons are released as light (photostimulated luminescence), and the emitted light is captured and converted into a digital image. The typical phosphor is europium-doped barium halide (for example BaFBr:Eu2+). The other options don’t fit because a silicon detector is used in direct/indirect digital flat-panel detectors, plastic film corresponds to traditional film-screen radiography, and cold cathode material refers to the x-ray tube cathode, not the imaging plate.