Why is image intensifier C-arm gradually replaced by Flat panel detector C-arm?

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Currently on the market C-arm X-ray machine can be divided into two types of image intensifier C-arm and flat panel C-arm, the former use image intensifier, the latter uses a digital flat detector, the two imaging principles are fundamentally different.

Image intensifier was introduced in the 1950s, image intensifier for real-time imaging, will penetrate the body of X-rays into visible light, and make the image brighter, once the exposure is stopped, the image disappears. In order to carry out image processing, the image intensifier needs to cooperate with the camera system, the image is captured and converted into electrical signals for processing. Therefore, its imaging sessions are many and long, easily resulting in the loss of image information and the increase of noise, and the image quality is not ideal due to the low resolution.

Comparison of image intensifier C-arm and flat-panel C-arm images

Digital flat panel C-arm is a new technology developed in the 1990s. The imaging principle is that X-rays pass through the object, different degrees of attenuation occurs, the role of the scintillation layer. x-ray photons are first converted into visible light and then by the amorphous silicon photovoltaic layer is converted to electrical signals stored in capacitors, in the electrical signals are converted to digital signals, and finally after the internal storage and processing of the image will be displayed on the monitor.

From the technical principle, flat-panel C-arm has many advantages, in terms of image quality, imaging speed, amplitude field of view, dose are superior to the image intensifier C-arm. Over the past 15 years, the C-arm X-ray market has shifted from image intensifiers (IIs) to flat panel detectors (FPDs). While there are still many hospitals using image intensifier C-arms, it is a foregone conclusion that they will be phased out by flat-panel C-arms.

As a more advanced technology, digital flat-panel detectors are also widely used in interventional therapy, such as the mobile flat-panel interventional C-arm PLX7100A designed specifically for peripheral interventional therapy, which is equipped with a new type of large-size amorphous silicon dynamic flat-panel detector with a larger field of view, capable of achieving full coverage of the thoracic, abdominal, and pelvic cavities at one time to reduce the number of exposures, lower the radiation dose, avoid overlapping omissions, and shorten the procedure time.

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