What are the detector elements (DELs) in a digital radiography detector primarily responsible for?

• A. Converting x-ray interactions into electrical signals
• B. Displaying the image on screen
• C. Storing image data as DICOM
• D. Producing a phosphor layer

Answer: (A)

The main function of detector elements is to convert x-ray interactions into electrical signals. Each detector element, or DEL, acts as a pixel-sized sensor that captures the energy deposited by x-rays and turns it into a charge that can be read out as an electrical signal. In indirect digital radiography, x-rays first interact with a scintillator to produce light, which is then converted to an electrical signal by a photodiode within each DEL. In direct digital radiography, the x-rays create charge directly in a photoconductor like amorphous selenium. This electrical signal carries the image information and is subsequently amplified, digitized, and processed to form the digital image. Displaying the image on a screen, storing the data as DICOM, or the presence of a phosphor layer are separate parts of the system or workflow and are not the DEL’s primary role.