The principle of the x-ray collimator

What is the principle of the x-ray collimator?After entering the X-ray channel, it is shielded by the lower set of shields to simulate the range of the X-ray irradiation field. At present, the light source part mostly adopts an automatic light-off device, which automatically turns off the light when it reaches the predetermined time after it is turned on. This can reduce operating steps, avoid forgetting to turn off the light, and prolong the life of the light bulb. The light beam device, also known as the shrinker, is installed at the window position of the X-ray tube sleeve to control the size of the X-ray irradiation field, cover unnecessary X-rays, and reduce the exposure dose and exposure of the subject as much as possible. Improve image clarity. There are also light sources and reflectors inside the light beam device for photography to simulate the indication of the radiation field of the X-ray tube. The beam light device for photography uses a light source (bulb) to simulate the focus position of the X-ray tube. and centerline.
There are various types of light beam devices according to their structure, and the shading effect and application are also different.
The structure of the electric light beam device is basically the same as that of the manual type, except that the moving power of the shield is provided by a small motor. By controlling the forward, reverse and action time of the motor, the irradiation field can be adjusted to an appropriate size. The opening and closing of the multi-leaf sunshade in the vertical and horizontal directions is controlled by two micro motors through two sets of reducers and transmission mechanisms, and the irradiation field will change accordingly. The rotation of the motor is controlled by a manual switch and a limit switch. Some electric beam devices can be automatically adjusted with changes in the perspective distance to keep the size of the irradiation field constant. During spot film photography, it is automatically converted to the irradiation field size corresponding to the selected film specification and division method. The beam grating in cardiovascular equipment can also rotate clockwise or counterclockwise with the X-ray centerline as the axis, so as to achieve better control of the irradiation field. Direction of irradiation field The light beam device for photography uses a light source (bulb) to simulate the focus position of the X-ray tube. The light enters the X-ray channel through the reflector, and is blocked by the lower group of shielding boards to simulate the range of the X-ray irradiation field. At present, the light source part mostly adopts an automatic light-off device, which automatically turns off the light when it reaches the predetermined time after it is turned on.

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Author:X Ray Collimator