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Imaging principle of amorphous selenium flat panel detector

Do you know the imaging principle of amorphous selenium flat panel detector?
When X-rays irradiate the amorphous selenium layer in a preset initial state and excite electron-hole pairs, the electron and hole pairs move in the opposite direction under the action of an external electric field to generate a current. The current size is proportional to the incident ray photon In direct proportion to the number, these current signals are stored in the inter-electrode capacitance of the TFT, and each TFT and the capacitor form a pixel unit. Finally, the stored charge of the TFT layer is read out, amplified and converted by A-D, and then output to the computer to restore the image. After all the charge signals are read out, the residual charge will be eliminated to return to the initial state.
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