How is the sensitivity of a digital detector measured?

The sensitivity of a digital detector is measured primarily by determining its response to radiation and how effectively it converts X-ray photons into a digital signal. This is crucial because a detector's sensitivity affects the quality of the images it produces and its ability to detect low levels of radiation. When a detector has high sensitivity, it can respond efficiently to the incoming X-ray photons, leading to clearer images and better diagnostic capabilities.

The conversion process involves several factors, including the detector's material composition and the technology employed, which influence how well the detector can absorb X-rays and generate an appropriate electronic signal that translates into a digital image. This measurement is vital for Diagnostic Radiology as it impacts both the quality of the imaging and the dose of radiation the patient is exposed to.

The other options do not directly relate to the detectors' sensitivity concerning their response to radiation. While physical dimensions and construction materials may play a role in the overall performance of a detector, they are not the primary measure of sensitivity. Similarly, the time taken to produce an image and the number of images captured per minute are more related to the speed and efficiency of the imaging process rather than the sensitivity of the detector itself.