In digital radiography, which characteristic provides the main dose-sparing advantage over older systems?

• A. Lower processing time
• B. Wider dynamic range
• C. Increased need for filtration
• D. Higher equipment cost

Answer: (B)

Digital radiography saves dose mainly because its detectors have a wide dynamic range, meaning greater exposure latitude. This lets a broader range of exposures still produce a diagnostically useful image, so technique errors or suboptimal exposures don’t force repeat exams as often as with older film-screen systems. With fewer repeats, the patient’s overall radiation dose is reduced. Digital imaging also benefits from processing tools and automatic exposure control that help optimize image quality at lower doses. The other options don’t directly drive dose reduction: processing speed affects workflow, filtration needs or costs don’t inherently lower patient dose.