The exposure latitude of digital projection radiography responds in a _____________ manner.

• A. Linear
• B. Nonlinear
• C. Logarithmic
• D. Exponential

Answer: (A)

Digital projection radiography shows a linear response to exposure across a wide range, so the image signal increases proportionally with the amount of X‑ray exposure. This linearity gives broad exposure latitude: the detector can produce usable grayscale over a wide dose range, and, with the display LUT and windowing, the brightness/contrast can be adjusted without losing diagnostic information. In contrast, film has a nonlinear, S‑shaped response with more limited latitude, where small changes in exposure can dramatically affect density. That's why the correct description is linear.