The working principle of x-ray collimator

The x-ray collimator, also known as the x-ray 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 X-ray bulb under the premise of satisfying the X-ray imaging diagnosis. The irradiation field of the output line of the tube minimizes the projection range and avoids unnecessary doses. And can absorb some scattered light to improve image clarity. In addition, it can also indicate the projection center and the size of the projection field of view. Therefore, the X-ray beam device is an indispensable auxiliary device for X-ray irradiation and protection.
The x-ray collimator is mainly connected with the tube, and its main function is to perform positioning during positioning and simulate the radiation area of ​​X-rays, which can reduce the radiation dose of the patient and enhance the image quality. Its internal structure is also equipped with a lighting field indicator system. It uses the indicator bulb to simulate the focus of the x-ray tube, replaces the x-ray with visible light, and is incident on the bed surface after being reflected by a reflector. The optical path of the visible light after reflection is consistent with the optical path of the x-ray after passing through the reflector, and the size of the irradiation field can be indicated in advance. Due to the short service life of the indicator light, the lighting of the indicator light is controlled by a button switch, which can be automatically turned off within 15s～1min. Some indicators have two levels of brightness during their service life to meet the requirements of indoor high-brightness lighting on-site instructions. The reflector is usually made of silver-plated plastic, with an aluminum equivalent of about 0.5 mm, which will not affect X-ray imaging. A clean and transparent plastic plate is also installed in front of the x-ray collimator. Black lines or dots are engraved on the plate to indicate the center of the light field. Some x-ray collimators are marked with the corresponding focal length of the irradiation field size around the knob or within the range of the pull rod. They are mainly used to pre-set the irradiation field size before the irradiation field indicator light is turned on, so that the irradiation field can be quickly adjusted after the indicator light is turned on.
Size, prolong the service life of the indicator light.
Our company’s x-ray collimator is divided into manual gear and electric gear. The electric gear is mostly used for dynamic fluoroscopy such as remote gastrointestinal machines. The manual gear is more suitable for photography. By manually adjusting the knob or lever on the x-ray collimator To realize the opening and closing activities of the x-ray collimator covering the lead leaf. Its internal structure is also equipped with a lighting field indicator system.
Main parameters of x-ray collimator:
Applicable to high voltage, large irradiation field, average brightness of light field, illuminance, light bulb, light field lamp single lighting time, focus-mounting surface distance (adjustable as required), inherent filtering, additional filtering (optional), External, optional, blade drive mode, etc.

Author:Lillian