The beam limiter is an electromechanical optical device installed in the output window of the tube sleeve of the X-ray tube assembly. Its main function is to control the radiation field of the X-ray tube output line, so as to minimize the projection range and avoid unnecessary dose on the premise of meeting the requirements of X-ray imaging and diagnosis.And can absorb some scattered rays, improve the clarity of the impact.In addition, it indicates the projection center and the size of the projected field of vision.Therefore, the beam limiter is an indispensable auxiliary equipment for X-ray projection and protection.
Manual beam limiter is mainly used in photography. The opening and closing activities of the line cover lead leaf of the beam limiter are realized by manually adjusting the knob or lever on the beam limiter.In addition to the internal structure mentioned above, it is also provided with an irradiation field indicating system.It USES a light bulb to simulate the focus of the X-ray tube, replacing the X-ray with visible light, reflecting through the mirror, into the bed.The path of visible light reflected is the same as that of the X-ray beam passing through the mirror, so it can indicate the size of the field in advance.
The electric beam limiter is mainly used in fluoroscopy, which is convenient for remote control, and it is an essential component for remote control gastrointestinal bed.The opening and closing of the lead blade of the electric beam limiter is generally driven by the micro-DC motor, and the irradiation field can be adjusted to the required size by properly controlling the forward, reverse and running time of the DC motor.Electric limited beam radiation fields both in the limit of the regulation of beam splitter, also has in the bedside table to control the operation, the latter except for continuous adjustment, there are a variety of fixed size the radiation field of option buttons, just press the button, the motor is driven lead leaf movements to the selected fixed after radiation field, in order to meet the specific requirements of photography.
There is little difference in structure between automatic and electric beam limiter, except that the automatic beam limiter is equipped with a lead-leaf state detection device.In terms of function, with the change of focal length, the automatic beam limiter has the ability to automatically maintain the size of its exposure field, which is mostly used for perspective.
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