X-ray flat panel imaging performance index

In terms of imaging quality, there are two performance indicators for evaluating its X-ray flat panel detector, quantum detection efficiency and spatial resolution. Among them, the quantum detection efficiency determines the resolution ability of the X-ray flat panel detector to the density difference between different tissues, and the spatial resolution determines the resolution ability of the X-ray flat panel detector to the fine structure gaps in the tissue. Different types of X-ray flat panel detectors have different influence factors on quantum detection efficiency and spatial resolution.

In the indirect conversion X-ray flat panel detector, the transistor that converts visible light into an electrical signal and the coating of the scintillator can affect its quantum detection efficiency, while in the direct conversion X-ray flat panel detector, the quantum detection efficiency is similar to that of amorphous selenium. The strength of the layer’s ability to generate charge is related. The spatial resolution in the direct conversion X-ray flat panel detector depends on the size of the thin film transistor matrix per unit area, while in the indirect X-ray flat panel detector, the size of the thin film transistor matrix in the unit plane is affected by the control of the scattered light. The size of its spatial resolution.

Because different X-ray flat panel detectors distinguish different tissue densities or density of dense tissues in tissues, in actual clinical operations, the use of different X-ray flat panel detectors at different locations is beneficial to the improvement of image quality.

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Author：肖恩