In digital imaging, which term describes the Detective Quantum Efficiency preserved regardless of patient dose?

• A. Spatial resolution
• B. Detective Quantum Efficiency
• C. Contrast resolution
• D. Radioactive contamination

Answer: (B)

Detective Quantum Efficiency describes how efficiently the imaging detector preserves the signal-to-noise ratio from x-ray exposure to the final image. It reflects the detector’s ability to convert incoming x-ray signal into useful image detail while minimizing noise and loss, effectively indicating how much image quality is retained as dose changes. A detector with high DQE delivers better image quality at a given dose and can maintain that quality with less dose, which is why it’s considered independent of patient dose in terms of performance. Spatial resolution is about how small details can be distinguished, contrast resolution is about gray-level differences, and radioactive contamination is unrelated to detector performance.