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How to compare different flat panel detectors?

There are two main performance indicators for evaluating the quality of flat panel detectors: Detective Q uantum E fficiency (DQE) and spatial resolution. DQ E determines the resolution of flat panel detectors for differences in tissue density; spatial resolution determines the resolution of tissue microstructure. Investigating DQ E and spatial resolution can evaluate the imaging capabilities of flat panel detectors.
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Second, the way in which the visible light generated by the scintillator is converted into an electrical signal also affects DQ E . In a flat panel detector of yttrium iodide (or yttrium oxysulfide) + thin film transistor (T FT), since the array of TF T can be made as large as the area of ​​the scintillator coating, the visible light does not need to pass through the lens. Refraction can be projected onto TF T with no photon loss in between, so DQE is also high; in flat panel detectors of cesium iodide (CsI) + CCD (or CM OS), due to C CD (or CM) The area of ​​OS) cannot be as large as the scintillator coating, so it needs to be refracted and reflected by the optical system to project all the images onto C CD (or CM OS). This process causes loss of photons, so DQE Relatively low.

Author:Alina

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