Research On The Long Bone Skeleton 3d Reconstruction Method Based On Biplanar Orthogonal X-ray Views

X-ray has attributes of penetrability, photo-electric sensitivity and fluorescent effect. Thickness and density is different in different areas of human tissue. When the X-ray goes through various organizations or structure, the absorptivity should be diverse. Then there are some differences in the quantity of X-ray that arrive at the screen or the film. Thus, in contrast of black and white, images are formed in the screen or the film. In this paper, the input information comes from two orthogonal X-ray films. Research perspective is the computer graphics, and the 3D model of Femoral Skeleton is reconstructed in use of the core 3D reconstruction algorithm. It could reflect the basic information of the bone fracture site, and overcome drawbacks of the traditional X-ray imaging.In reference to a large number of local and foreign document literatures, long bone model is simplified rationally. In theory, 3D reconstruction points can be calculated based on direct linear transformation (DLT) algorithm. Prior to that, good calibration data must be obtained in order to ensure the accuracy of the calculation. In addition, the input of whole reconstruction method is contour points on 2D images. So, there be necessary about its extract the contour data from the X-ray film of the femur. Appropriate image segmentation method, which is combined with the existed edge detection algorithm, should acquire perfect edge detection so that the contour data contained in 2D X-ray images could be extracted and stored up.Edge detection results and the contour data, which come from two orthogonal X-ray films of the femur, proves that the proposed scheme for edge detection of effectiveness and convenience. Furthermore, in accordance with the principle of calibration points layout using DLT algorithm, the calibration data is gained in cases of biplanar orthogonal and non-orthogonal views under the projection principle. That provides the foundation for 3D model reconstruction of the femur skeleton. In the MATLAB software environment, the simulation results show that the whole method in the core of DLT algorithm can indeed complete the reconstruction in use of two X-ray views.