In a flat-panel detector, which component stores the charge on a per-pixel basis prior to readout?

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Multiple Choice

In a flat-panel detector, which component stores the charge on a per-pixel basis prior to readout?

Explanation:
In a flat-panel detector, each pixel has its own tiny storage capacitor connected to a thin-film transistor. After the X-ray signal is converted to charge by the detector stack (a scintillator in indirect detectors or a direct photoconductor in other designs), that charge is stored on the pixel’s storage capacitor. The thin-film transistor then acts as a switch to hold and later read out that charge row by row. The scintillation layer is responsible for converting X-rays to light, the photodiode collects and converts light to charge, and a CCD is a different sensor technology not used for the per-pixel storage in these panels.

In a flat-panel detector, each pixel has its own tiny storage capacitor connected to a thin-film transistor. After the X-ray signal is converted to charge by the detector stack (a scintillator in indirect detectors or a direct photoconductor in other designs), that charge is stored on the pixel’s storage capacitor. The thin-film transistor then acts as a switch to hold and later read out that charge row by row. The scintillation layer is responsible for converting X-rays to light, the photodiode collects and converts light to charge, and a CCD is a different sensor technology not used for the per-pixel storage in these panels.

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