Which component of a digital detector is responsible for producing light after absorbing X-rays?

Which component of a digital detector is responsible for producing light after absorbing X-rays?

• A. Scintillator
• B. Photodiode
• C. TFT
• D. Cathode

Answer: (A)

Light production after X-ray absorption comes from a scintillator. In indirect digital detectors, X-rays are first absorbed by a scintillating material (such as CsI or Gd2O2S), which emits visible light as a result. That light is then detected by the underlying photodiode array, which converts the light into an electrical signal that the TFTs read out. The TFTs act as switches and routing for the signal, not light sources, and the cathode isn’t involved in producing light in this detector setup.

Light production after X-ray absorption comes from a scintillator. In indirect digital detectors, X-rays are first absorbed by a scintillating material (such as CsI or Gd2O2S), which emits visible light as a result. That light is then detected by the underlying photodiode array, which converts the light into an electrical signal that the TFTs read out. The TFTs act as switches and routing for the signal, not light sources, and the cathode isn’t involved in producing light in this detector setup.