Digital image receptors are more sensitive to which factor?

• A. Scatter and background radiation
• B. Fluorescent lights
• C. Free electrons
• D. Free radicals

Answer: (A)

Digital image receptors respond to the photons that reach them, and their image quality is especially affected by extraneous exposure. Scatter and background radiation add unwanted photons to the detector, creating a hazy background and reducing image contrast. This extra, non-image signal lowers the signal-to-noise ratio, making details harder to see even though the detector can handle a wide range of exposures.

Fluorescent lights aren’t part of the x-ray exposure reaching the detector, so they don’t influence the captured image. Free electrons and free radicals aren’t the factors that determine the receptor’s sensitivity in this context; they’re related to other aspects of radiation interactions, not the primary image formation on digital receptors.