Beam limiters are classified into two categories according to the spherical tube. They are suitable for beam limiters of 125 KV and 150 KV spherical tubes. The 150 KV tube is usually large in size, good in performance, and also needs high performance beam limiter matching. It is suitable for large hospitals and fixed X-ray machines. The x ray collimator suitable for fixed X-ray machines is NK202 beam limiter. The x ray collimator suitable for fixed X-ray machines usually provides perfect image quality for the beam limiter used in 150 KV spherical tube. The motion structure design of skyscraper hanger is flexible, convenient and efficient. Newheek’s NK202 beam limiter is suitable for this suspended electric bed flat DR. The maximum irradiation field of the x ray collimator suitable for fixed X-ray machines is 430 mm x 430 mm (SID = 90 cm). This beam limiter is a manual beam limiter.