What is the relationship between DQE and MTF?

The relationship between Detective Quantum Efficiency (DQE) and Modulation Transfer Function (MTF) is a fundamental concept in imaging physics. DQE is a measure of how efficiently an imaging system captures and converts incident radiation into a usable image, taking into account noise and signal quality. MTF, on the other hand, quantifies the ability of the system to preserve contrast at different spatial frequencies, reflecting image resolution.

The formula that expresses this relationship is DQE = MTF^2. This indicates that DQE is proportional to the square of the MTF. In essence, as the MTF increases (indicating higher resolution and contrast at different frequencies), the DQE also increases, but at a squared rate. This squared relationship highlights the importance of both the preservation of detail (MTF) and the effective utilization of the detected signal (DQE) in producing high-quality images.

Understanding this relationship is crucial for evaluating and optimizing imaging systems, particularly in modalities such as fluoroscopy, where image quality can significantly impact diagnostic outcomes.