Image Mosaic technology is DR In the automatic control program mode, a one-time collection of different locations of multiple images, and then by the computer panoramic Mosaic, synthesis into large format X-ray images. There are two ways to splice images.

The first splicing method is that during image acquisition and exposure, the X-ray tube assembly is fixed in one position, the detector moves along the long axis of the subject's body for 2 to 5 times, and the X-ray tube assembly is exposed for 2 to 5 consecutive times. The computer then reorganizes the multiple sets of data collected by 2 to 5 exposures to do "automatic seamless stitching" to form an overall image. The main feature of this method is that in order to reduce the image distortion caused by the conical X-ray beam, different tilt angles are set for the X-ray tube assembly during multiple exposures, that is, the non-parallel photography technology adopted by the X-ray tube assembly and the detector can effectively eliminate the image distortion and matching dislocation caused by parallax in the process of image blending. Accurate registration technology is used in image integration, and its characteristics are as follows:

(1) Accurately register the stitching position of the two images to solve the geometric distortion of the overlapping part;

(2) The pixel density distribution at the image splicing is correctly registered, so that the whole image shows continuous and uniform contrast;

(3) Automatic quantitative analysis of data;

(4) With organizational balance, noise reduction, optimal window width and window position, contrast and brightness consistency, orthopedic calculation and measurement software and other processing functions, to ensure high-quality image output.

The second splicing method is that the X-ray tube assembly moves vertically up and down, the DR Detector moves synchronously with the X-ray tube assembly, and the splicing method is automatic after sub-pulse exposure acquisition. The specific acquisition process is as follows: First, the position of the first X-ray photography area is determined. After exposure, the X-ray tube assembly and detector are moved along the long axis of the subject's body to the position of the second area for the second exposure. Multiple exposures are then made, and the computer then reassembles and "automatically and seamlessly splices" the multiple sets of data collected at each exposure to form an overall image. The main features of this method are:

(1) The center line and the detector are always vertical when exposed. In order to reduce the image distortion caused by the X-ray conical beam, the X-ray tube assembly adopts a long field of view, and the photographic length is controlled within 5~10.0cm, thus reducing the projection of the oblique line;

(2) According to the photography area to determine the number of photography, the maximum optional photography length is 198.0cm;

(3) Simultaneous translation and fractional exposure of the X-ray tube assembly and detector, each image has a slight overlap, so as to facilitate computer positioning and image registration;

(4) It has the functions of organization balance processing, noise reduction, optimal window width, contrast and brightness consistency, etc., to ensure high-quality image output.