According to the driving mode of the opening and closing of the guide vane of the collimator, it can be divided into the following types.
1. Manual fluoroscopy collimator is mainly used for photography. The opening and closing of the shielded lead leaf is realized by manually adjusting the knob or the pull rod. In addition to the above internal structure, an irradiation field indication system is also provided. It uses an indicator bulb to simulate the focal point of the tube x-ray, uses visible light to simulate the preset x-ray, and shoots it toward the bed surface through the reflection of the mirror. The reflected visible light path is consistent with the path of the x-ray after passing through the lens, and the size of the irradiation field can be predicted in advance. Due to the short service life of the indicator light, the brightness of the indicator light is controlled by a button switch, which can be automatically turned off within 15s ~ 1min.
2. The electric fluoroscopy collimator is a commonly used equipment in fluoroscopy, which is convenient for remote control and is an important part of the remote control of fluoroscopy X-ray machines. The opening and closing of the guide vanes of the electric fluoroscopy collimator is usually driven by a micro DC motor. By controlling the forward rotation, reverse rotation and working time of the DC motor, the irradiation field can be adjusted to the required size. The adjustment of the electric fluoroscopy collimator can be carried out on the fluoroscopy collimator or on the operating table beside the bed. In addition to continuous adjustment, the latter also has various fixed-size irradiation field selection buttons. As long as these buttons are pressed, the motor will drive the guide vane to move to the selected area and fix it to meet specific photography requirements.
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