In digital imaging, what does "high detective quantum efficiency" signify?

High detective quantum efficiency (DQE) in digital imaging indicates a more efficient conversion of x-ray signals into usable image data. A high DQE means that the imaging system can produce high-quality images with less radiation exposure by effectively converting incoming x-ray photons into output signals that contribute to image formation. This capability enhances the system's performance, allowing for improved image quality while minimizing the amount of radiation that needs to be used during imaging procedures.

In digital mammography, optimizing DQE is crucial because it impacts both image quality and patient safety. Higher DQE values ensure that diagnostic images can be obtained at lower doses, which is particularly important in mammography due to the sensitivity of breast tissue to radiation. Hence, a high DQE directly contributes to improved diagnostic efficacy.

The other options relate to aspects of imaging systems but do not capture the definition or implications of high DQE as accurately as the correct choice. For example, the fill factor in the TFT array pertains to the ratio of active detection area to the total pixel area but does not directly define DQE. Less image resolution and higher patient exposure to radiation are drawbacks of imaging systems rather than attributes of high DQE.