The beam limiter is an electromechanical optical device installed in front of the output window of the X-ray tube assembly sleeve. Its main function is to control the irradiation field of the output line of the X-ray tube to achieve the requirements of X-ray imaging and diagnosis. Try to narrow the projection range to avoid unnecessary doses; and can absorb some scattered rays to improve the impact of clarity. It can also indicate the projection center and the size of the projection field. The beam limiter is an indispensable auxiliary device for X-ray projection and protection.
The manual beam limiter is mainly used for photography. By manually adjusting the knob or pull rod on the beam limiter, the opening and closing activities of the wire shielding guide vane of the beam limiter can be realized. In addition to the above internal structure, there is also a super irradiated field indicator system. The beam limiter uses an indicator bulb to simulate the focus of the X-ray tube, and replaces the X-ray with visible light, which is reflected by the reflector and hits the surface of the bed. The reflected visible light optical path is consistent with the optical path of X-rays after penetrating the reflector, so the size of the irradiation field can be indicated in advance. Due to the relatively short service life of the indicator light, the indicator light is controlled by a button switch, which can be turned off by itself within a specified time. The indicator light will reach two brightness levels during its service life to meet the needs of the lighting field. Some beam limiters are marked with the field size of the corresponding focal length around the knob or within the range of the rod. It is mainly used to preset the scene before the scene indicator lights up, so that it can be faster after the indicator lights up. Adjust the size of the illuminated area to extend the life of the indicator light.
Author:X Ray Collimator