What is the difference between amorphous silicon and amorphous selenium materials for C-arm flat panel detectors?

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Flat panel detector is one of the important parts of the C-arm X-ray machine, its role is to C-arm emission penetration of the human body after the X-rays generated by the image signal is converted into a digital image that can be stored and processed.

There are amorphous silicon and amorphous selenium C-arm flat panel detectors. The core of amorphous silicon flat panel detectors is a matrix plate composed of amorphous silicon and thin film transistors, whose good density and spatial resolution represent the main direction of current development. Amorphous selenium flat panel detectors use selenium as a photoconductive material, which can convert optical signals directly into electrical signals, thus avoiding scattering.

The following is to introduce the difference between the two, which is an important guidance for hospitals to reasonably select C-arm equipment.

First, the difference in structure

Amorphous silicon flat panel detector structure is mainly composed of scintillator and photoreceptor (with a photodiode role of amorphous silicon layer) integrated together and then add the TFT array; amorphous selenium flat panel detector structure is mainly composed of amorphous selenium layer and TFT array.

Second, the principle of A/D conversion is different

Amorphous silicon is the principle of scintillator by X-ray exposure, the X-ray photons converted to visible light, and then amorphous silicon layer through the role of the photodiode will be converted to electrical signals, through the TFT detection array, and then by the end of the A/D conversion to obtain a digital image; amorphous selenium is the principle of amorphous selenium layer by the direct generation of electrical signals after the exposure of X-rays, through the TFT detection array, and then after the A/D conversion to obtain a digitized image. After conversion to obtain a digital image.

Third, the fluorescent material layer and the detection element array layer of different

Generally speaking, the image clarity of amorphous selenium plate is better than amorphous silicon plate, better sharpness.

Fourth, the use of cost differences

Amorphous selenium flat panel detector in the use of the process of working environment requirements are very high, the service life compared to amorphous silicon flat panel is shorter, and the failure rate is higher, the maintenance cost is also greater than the amorphous silicon flat panel detector.

Cesium iodide amorphous silicon flat panel

Summary: In the imaging effect of amorphous selenium detector imaging effect is better than amorphous silicon, the image is clearer, sharper, but amorphous selenium flat panel detector technology has not yet been stabilized, the use of the environment has very high requirements, and high maintenance costs. Therefore, the current amorphous silicon flat panel detector is still the mainstream of the market. For example, in recent years, the domestic three-dimensional flat C-arm PLX7500 series, which has received widespread attention, the dynamic flat panel detector is a 30cm × 30cm cesium iodide amorphous silicon flat panel, and it is produced by Perlove medical original factory. Perlove Medical has developed into one of the few core component manufacturers in China, and now has the capability of independent , production and manufacturing of bulb tubes and high-voltage generators, and the company is at the top of the list of C-arm sales volume in 2022.

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