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Why are the x ray collimator rectangular?

The rectangular x ray collimator is a commonly used beam limiter, and the square beam field of the rectangular beam limiter has stability.
The rectangular x ray collimator housing is made of ferrous material, rectangular appearance and square field of view, which makes the X-ray rectangular beam illuminator system stable.
Why are the x ray collimator rectangular
In order to ensure that the rectangular x ray collimator can emit X-rays in an appropriate amount, the outer wall of the rectangular x ray collimator is made of double-lead lead material. The rectangular beam limiter uses lead leaf to control the size of the X-ray field, and the blade also contains lead. Two pairs of lead leaves are at the entrance of the ray, two pairs of lead leaves are in the middle, two pairs of lead leaves are at the ray exit, and a rectangular beam limiter contains six lead blades. During the process of closing the lead leaves, the rectangular beam limiter The field of view is always square, and a knob on the outside of the beam limiter can manually control the rotation to control the degree of closure of the blade.
The lower right side of the rectangular x ray collimator has a ruler that measures the distance from the rectangular x ray collimator to the bed surface to estimate the SID.
Why are the x ray collimator rectangular

Author:Abby