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What’s the role of the X-ray collimator is to X-ray machine?

The x ray collimator is an important device in Xray diagnostics. What kind of x ray collimator is a good x ray collimator?
The role of the x ray collimator is to control the Xray field, so that the X-rays required for human diagnosis can be controlled within a certain range and position, so as to avoid excessive Xray damage to the human body, so the quality of the x ray collimator is guaranteed. , we have to do, what is the specific standard?

What is the difference between the LED light and the halogen light in the x ray collimator

In the industry standard YY0007 ~ 0009-90 on the technical standard of 200 ~ 500m medical diagnostic Xray machine, the performance requirements of the x ray collimator in Article 4.19 are as follows: x ray collimator should be light, flexible, reliable, and It can adjust the rectangular illumination field of any size. When the gastrointestinal examination photographic device is pulled farthest from the bed surface and the x ray collimator is kept to a minimum, the illumination field on the screen should be no more than 20 mm20. The deviation of the center of the Xray irradiation field from the center of the light irradiation field and the deviation of each edge thereof should be within 2% of the distance from the focus of the Xray tube to the image receiving surface.