Indirect Thin Film Transistor Array (Flat Panel) | X-ray Physics | Radiology Physics Course #35

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The indirect thin film transistor array also requires X-ray photons to be converted to light. But unlike the CCD system the light is converted to electrical signal by a photodiode layer. The electrical current is stored in a capacitor on the TFT array prior to readout. Readout occurs when the TFT transistor switch is closed and current can flow from the capacitor to the computer.

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