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What type of beam limiter is a rectangular beam limiter?

The shell of the rectangular x ray collimator is made of iron, with a rectangular appearance and a square field of view, which makes the X-ray rectangular beam limiter system stable.
What type of beam limiter is a rectangular beam limiter
In order to ensure that the rectangular beam limiter can radiate X-rays in an appropriate amount, the outer wall of the rectangular beam limiter is made of double lead lining material. The rectangular beam limiter uses a lead leaf to control the size of the X-ray field. The blade also contains lead. Two pairs of lead blades are at the entrance of the ray, two pairs of lead blades are in the middle, two pairs of lead blades are at the exit of the ray, and one rectangular beam limiter contains six lead blades. During the process of closing the lead blade, the field of vision of the rectangular beam limiter is always square. The knob on the outside of the beam limiter can manually control the rotation to control the closure degree of the blade.
There is a ruler on the right side below the rectangular beam limiter, which can measure the distance between the rectangular beam limiter and the bed surface, and thus estimate the SID.
What type of beam limiter is a rectangular beam limiter

Author:Abby