The pixel structure of digital detector is generally divided into two types: – passive pixel PPS: the whole area of pixel is used to detect optical signal, and the pixel does not contain amplifier;- active pixel APS: each pixel contains a photodetector and amplifier.
As far as X-ray detector products on the market are concerned, TFT flat panel detector USES passive PPS, while CMOS flat panel detector USES both pixel structures.
Currently, the X-ray dose required for dental CBCT imaging is between 20uSv and 50uSv. At this dose, the aps-type CMOS flat panel detector,
There is little difference in imaging quality between PPS CMOS and TFT digital detectors.CMOS tablets offer performance advantages when no splicing is required.