The flat plate detector is one of the important parts of the dynamic mobile flat plate C-arm, its role is to convert the image signal generated by X-rays after the mobile flat panel C-arm emits penetration into the human body into a digital image that can be stored and processed.
The flat panel detector of the dynamic mobile flat panel C-arm is available in amorphous silicon and amorphous selenium. The core of amorphous silicon flat panel detector is a matrix plate consisting 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 the photoconductive material, which can convert the optical signal directly into electrical signal, thus avoiding scattering.
The following is to introduce the difference between the two, which has an important guiding significance for hospitals to reasonably choose dynamic mobile flat panel C-arm equipment.
First, the difference in structure
The structure of amorphous silicon flat detector C-arm is mainly composed of scintillator and photoreceptor (amorphous silicon layer with the role of photodiode) integrated together with TFT array; the structure of amorphous selenium flat detector is mainly composed of amorphous selenium layer plus TFT array.
Second, the A/D conversion principle is different
The principle of amorphous silicon is that after the scintillator is exposed to X-rays, the photons of X-rays are converted into visible light, and then the amorphous silicon layer converts visible light into electrical signals through the role of photodiodes, through the TFT detection array, and then through the A/D conversion to obtain digital images; the working principle of amorphous selenium is that the amorphous selenium layer is exposed to X-rays to produce electrical signals directly, through the TFT detection array, and then through the A/D conversion to obtain digital images. After conversion, the digital image is obtained.
Third, the difference between the fluorescent material layer and the detection element array layer
Generally speaking, the dynamic moving plate C-arm using amorphous selenium plate image clarity is better than the amorphous silicon plate, better sharpness.
Fourth, the difference in the use of cost
Amorphous selenium plate detector in the use of the working environment requirements are very high, the service life is shorter than the amorphous silicon plate, and a higher failure rate, maintenance costs are also greater than the amorphous silicon plate detector.
In summary: dynamic mobile flat panel C-arm in the imaging effect, amorphous selenium detector imaging effect is better than amorphous silicon, the image is clearer and sharper, but the amorphous selenium flat panel detector technology is not yet stable, 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 has been widely concerned about the domestic mobile flat three-dimensional C-arm PLX7500 series, its dynamic flat detector is 30cm × 30cm cesium iodide amorphous silicon plate, the output of high-resolution, large three-dimensional image, can take a full section of the full cervical spine, full lumbar spine, seven thoracic vertebrae, bilateral sacroiliac joints, femoral head and unilateral pelvis, compared to a small field of view dynamic mobile flat C-arm It can avoid more radiation and time waste caused by multiple shots.
Perlove Medical has developed into one of the few core component manufacturers in China, and now has the ability to independently develop and manufacture bulb tubes and high voltage generators, and the company is at the top of the list of C-arm sales in 2022.
This dynamic mobile tablet C-arm provides intraoperative 3D reconstruction images to play the role of “intraoperative CT”, and can be connected with Perlove Medical’s orthopedic surgery robot equipment, which is compatible with the traditional 2D C-arm images and operation methods, but also can quickly generate CT-like tomography images and stereoscopic images during surgery. It is also compatible with the traditional 2D C-arm imaging and operation, and can quickly generate CT-like tomographic images and 3D images during surgery, providing the surgeon with richer image information to accurately observe the condition of the implant, such as the position and angle of the nail for internal screw fixation, to improve the success rate of surgery.