Final answer:
Light produced by incident x-ray on an FPIR is captured by the thin film transistor (TFT) array which converts it to an electrical signal for image processing.
Step-by-step explanation:
The light produced by incident x-ray exposure on a flat panel image receptor plate (FPIR) is captured by the thin film transistor (TFT) array. When x-rays strike the scintillator layer of the FPIR, they produce light flashes. These flashes are emitted from the scintillator and then captured by the TFT array. Each point in the array converts the received light into an electrical signal. The collected signals from all the points create a digital image, which is then processed by a computer to construct the final image for viewing. The actual detection sequence involves the conversion of x-ray energy to visible light by the scintillator, then the capturing of light by the photodiode within the TFT array, which finally gets converted to electrical signals for image processing.