The flat panel detector is the core component of the DR. The flat panel detector can be divided into two types from energy conversion: indirect conversion flat panel detector (indirect FPD) and direct conversion flat panel detector (direct FPD).
The direct conversion flat panel detector is mainly a flat panel detector composed of an amorphous selenium (a-Se) plus a thin film semiconductor array (TFT). Since amorphous selenium is a photoconductive material, an electron-hole pair is directly formed after X-ray exposure, an electrical signal is generated, an array is detected by a TFT, and a digitized image is obtained by A/D conversion. Since amorphous selenium does not generate visible light and has no effect of scattered light, a relatively high spatial resolution can be obtained.
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