What is dynamic range in digital radiography?

• A. The range of exposure levels that a sensor can reproduce without loss of detail
• B. The maximum physical size of the detector
• C. The scale of grayscale applied in post-processing
• D. The total dynamic exposure time of the system

Answer: (A)

Dynamic range in digital radiography is the span of exposure levels the detector can reproduce as meaningful signal without saturating or becoming too noisy. It means the detector can faithfully render both bright and dark regions in a single image, preserving contrast across a wide range of tissue densities. A wide dynamic range provides exposure latitude, so small mistakes in technique don’t wipe out detail in dense areas or introduce excessive noise in underexposed areas. This range is determined by the detector’s design and electronics, including the scintillator, photodetectors, and the analog-to-digital converter. The other concepts—detector size, post-processing grayscale adjustments, and exposure time—do not define how much detail across exposure levels the detector can preserve.