Figure 8. Diagram of an a-Si TFT array. The digital detector array is constructed from an a-Si TFT matrix deposited on a glass substrate. The CsI scintillator is deposited on the a-Si detector, and each light-sensitive diode element is connected by TFTs to control and data lines, so that charge produced in the diode in response to light emission from the scintillator is read out and digitized. (Courtesy of GE Healthcare, Waukesha, Wis.)