What does DQE measure in terms of imaging systems?

DQE, or Detective Quantum Efficiency, measures the efficiency of an imaging system in converting the input radiation into a useful image. Specifically, it evaluates how well the system produces high-quality images relative to the amount of radiation dose used. A high DQE indicates that an imaging system can produce clear and detailed images while using a lower dose of radiation, which is essential for patient safety and minimizing exposure.

In the context of mammography, a system with a high DQE allows for better image quality at lower doses, which is particularly important since mammography is often a screening tool and minimizes the radiation risk to patients. Thus, understanding DQE helps radiologists and imaging technologists assess and compare the performance of different imaging systems based on their effectiveness in producing quality images while keeping radiation exposure as low as reasonably achievable (ALARA principle).