Flat-panel detector systems typically use a thin-film transistor (TFT). This device functions to

Flat-panel detector systems typically use a thin-film transistor (TFT). This device functions to

• A. Convert X-Rays to Light
• B. Convert Light into Electrons
• C. Collect Electrical Charge
• D. Amplify Signal

Answer: (C)

In a flat-panel detector, the thin-film transistor acts as the pixel’s switching element that collects and stores charge created by X-ray exposure. Each pixel has a storage capacitor, and the TFT connects that capacitor to the readout circuitry in a controlled sequence. The charge gathered at each pixel is proportional to the X-ray intensity at that location, and the TFT then enables transferring this stored charge to the readout path for conversion to a voltage and ultimately digital data. This switching/collection role is why it’s described as collecting electrical charge. The other steps—X-rays to light, light to electrons, or signal amplification—are handled by other components in the system.

In a flat-panel detector, the thin-film transistor acts as the pixel’s switching element that collects and stores charge created by X-ray exposure. Each pixel has a storage capacitor, and the TFT connects that capacitor to the readout circuitry in a controlled sequence. The charge gathered at each pixel is proportional to the X-ray intensity at that location, and the TFT then enables transferring this stored charge to the readout path for conversion to a voltage and ultimately digital data. This switching/collection role is why it’s described as collecting electrical charge. The other steps—X-rays to light, light to electrons, or signal amplification—are handled by other components in the system.