The collimator is also called the beam light device and the beam limiter. It is an electromechanical optical device installed in front of the output window of the X-ray tube assembly. Its main function is to control the irradiation field of the X-ray tube output line. On the premise that X-ray imaging and diagnosis can be satisfied, the projection range should be minimized to avoid unnecessary dose; and some scattered rays can be absorbed to improve the resolution. In addition, it can also indicate the projection center and the size of the projection field. Therefore, the collimator is an indispensable auxiliary equipment for X-ray projection and protection.
The collimators are divided into the following three categories,
1. Manual collimator:
Manual collimators are mostly used in photography. The opening and closing activities of the lead leaves of this type of collimator are realized by manually adjusting the knob or pulling rod on the collimator.
2. Electric collimator: Electric collimator is mostly used in fluoroscopy, which is convenient for remote control, and is an indispensable component for remote control gastrointestinal bed. The opening and closing of the lead leaf of the electric collimator is generally driven by a micro DC motor, and the forward rotation, reverse rotation and running time of the DC motor can be properly controlled to adjust the irradiation field to the required size.
3. Fully automatic collimator:
There is little difference in structure between the automatic collimator and the electric collimator. The difference is that there is a lead leaf state detection device inside the automatic collimator. In terms of function, as the focal screen distance changes, the fully automatic collimator has the ability to automatically maintain the size of its irradiation field, which is mostly used for fluoroscopy.
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