The limit DQE of amorphous silicon flat panel detector is relatively high, but with the increase of spatial resolution, its DQE decreases more; while the limit DQE of amorphous selenium flat panel detector is not as high as the limit DQE of indirect conversion flat panel detector, but With the increase of spatial resolution, the DQE decline is relatively flat. At high spatial resolution, DQE surpasses the amorphous silicon flat panel detector. This characteristic indicates that the amorphous silicon flat panel detector has a strong ability to distinguish the difference in tissue density; while the amorphous selenium flat panel detector has a higher ability to distinguish the fine structure difference.
Ø Clinical application of different types of flat panel detectors
Since DQE affects the contrast of an image, spatial resolution affects the ability of the image to resolve details. In the film, the DR of different types of flat panel detectors should be selected according to different inspection locations. For examinations like the chest, the focus is on observing and distinguishing the density of different tissues, so the requirements for density resolution are relatively high. In this case, it is advisable to use the DR of the amorphous silicon flat panel detector, so that the DQE is relatively high, and it is easy to obtain a higher contrast image, which is more conducive to diagnosis; for the inspection of parts such as limb joints and breasts, it is necessary to With higher imaging and high spatial resolution requirements, it is better to use the amorphous selenium flat panel detector DR to obtain high spatial resolution images. At present, most manufacturers of digital mammography machines use amorphous selenium flat panel detectors. It is precisely because the mammography has high spatial resolution requirements, and only amorphous selenium flat panel detectors can meet the corresponding requirements.
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