How does exposure latitude in digital radiography compare with film-screen imaging, and what practice helps mitigate dose creep in DR?

• A. DR has wider exposure latitude than film-screen; dose creep is mitigated by technique charts, consistent use of AEC, and monitoring exposure indicators.
• B. DR has narrower latitude; mitigate by doubling dose.
• C. DR latitude is the same; mitigate by ignoring EI.
• D. DR has wider latitude; mitigate by lowering kVp only.

Answer: (A)

Digital radiography offers a much wider exposure latitude than film-screen imaging. The detectors in DR have a broad dynamic range and the imaging software can adjust brightness and contrast after exposure, so a wider variety of exposure values can still produce a diagnosable image. This flexibility reduces the immediate penalty for exposure errors, but it can lead to dose creep if exposures creep upward because image quality is often rescued digitally.

To prevent dose creep in DR, use technique charts to standardize appropriate exposure settings for different exams and patient sizes, rely on automatic exposure control consistently to set the correct exposure, and monitor the exposure indicators on the image to ensure doses stay within an acceptable range. These practices help keep patient dose in check while maintaining image quality.

The other options misstate the latitude or suggest ineffective or inappropriate mitigation.