In this imaging chain, which component ultimately provides digital data to be processed?

• A. ADC
• B. Scintillator
• C. PSP
• D. Silicon sensor

Answer: (A)

Digital data that a computer can process comes from converting an analog detector signal into digital form. In an imaging chain, detectors like a scintillator turn X-rays into light, and a PSP stores the image or a silicon sensor generates an electrical signal. But these signals are analog and must be converted to digital values for processing. This final step is performed by the analog-to-digital converter, which samples the analog signal and assigns discrete digital levels. So, the data that feeds processing is produced by the analog-to-digital converter, not directly by the detector elements themselves.