Which action can help reduce the system noise in digital radiography?

• A. Adequate mAs selection
• B. Use of grids
• C. Proper equipment maintenance
• D. Careful kVp selection

Answer: (C)

System noise in digital radiography comes from the detector electronics and readout process, presenting as background graininess that can obscure the true signal. Proper equipment maintenance—regular calibration of the detector, firmware updates, verification of gain and offset corrections, and routine cleaning and QA checks—keeps the detector response stable and minimizes electronic noise such as dark current and fixed-pattern noise. When maintenance is kept up, the system preserves a higher signal-to-noise ratio, so the image quality stays clearer even as other factors vary.

Other actions influence different aspects of image quality without directly reducing the detector’s intrinsic electronic noise. Increasing mAs mainly combats quantum noise from photon statistics; using grids reduces scatter to improve contrast; selecting the right kVp affects penetration and dose. While these are important for overall image quality, they don’t address the fundamental electronic noise that proper maintenance targets.