What does the acronym DQE stand for?

• A. Detective Quantum Efficiency
• B. Determining Quality Exposures
• C. Defective Quotient Equivalent
• D. Detailed Quote Estimate

Answer: (A)

Detective Quantum Efficiency is the recognized term for DQE. It describes how effectively a digital detector converts incoming x-ray photons into a usable image signal while managing noise. A detector with higher DQE produces a clearer image for the same dose, or achieves the same image quality with less exposure. DQE is actually a function of spatial frequency, meaning detectors often have higher efficiency for broader, coarse details and lower efficiency for fine details. This measure reflects how well the system preserves signal relative to noise, integrating how the detector’s sensitivity, sharpness (MTF), and noise characteristics (NPS) work together. The other options don’t correspond to standard radiography terminology, so they don’t describe a real detector performance metric.