The U-arm structure is designed as a vertical X-ray machine. Like ordinary X-ray machine, it needs a ball tube, a high-voltage generator, x ray collimator used for U-arm, a high-voltage cable, and a U-arm, which is equipped with a detector. It can also use an IP board and a dark box, but it is inconvenient. The structure design of U-arm makes it occupy very little space, but it can quickly realize the conversion of photographic parts, save photographic time, simple design, not simple function, reduce the failure rate of modular design of the whole machine, and facilitate maintenance. Its advanced flat panel detector makes the image clear. U-arm is a type of X-ray machine which can rotate 360 degrees and make people lie flat and stand for examination. It belongs to fixed X-ray machine. The x ray collimator used for U-arm is a beam limiter for fixed X-ray machine. It is generally used for 150 KV tube. Newheek’s x ray collimator used for U-arm is NK202.