Basic principles of X-ray flat panel detectors

The X-ray tube emits X-rays that can penetrate the object. The flat-panel detector can capture the X-rays and perform data conversion, and transmit the converted digital signals to the computer. The computer uses reconstruction software to convert the data into content that can be displayed on the screen.
The photosensitive layer is composed of some special compound crystals. These compounds are not unusual under sunlight. When X-rays irradiate these crystals, these crystals will glow and shine. The commonly used crystal compound is gadolinium oxysulfide. And cesium iodide. The X-ray absorbed by the crystal will be converted into visible light according to a certain proportion and converted into a corresponding number of electrons by the photodiode on the amorphous silicon glass plate. The size of the flat-panel detector’s micro-unit in daily life refers to the size of the pixel unit on the glass plate.

Author：Newheek-Detector