Final answer:
The detector element is located in the flat-panel detector, which is commonly used in various imaging systems.
Step-by-step explanation:
The detector element is located in the flat-panel detector.
A flat-panel detector is a type of photon detector that is commonly used in various imaging systems, such as X-ray machines and digital cameras. It consists of an array of detector elements that convert incoming photons into electrical signals, which are then processed to create an image. The flat-panel detector offers several advantages over other detection systems, including high resolution, fast response time, and low noise levels.