The Three-Dimensional Digital Modeling Of Human Tissues And Organs

Three-dimensional digital modeling is a core step of bionic manufacturing of human tissue and organ, it is also a hot issue in the field of computer-aided bionic manufacturing. The three-dimensional model is the foundation of followed three-dimensional scaffold and biological entities manufacturing, which will directly affect the final product quality. In addition, three-dimensional digital model can also assist doctors to improve the accuracy and Scientific of medical diagnostic. It has been widely used in plastic surgery and prostheses, surgical simulation, medical anatomy teaching and other fields. But the existing methods for three-dimensional modeling can build the outer surface of the tissue and organ. The internal structure and information extraction and expression of the methods is still not perfect, can't be full and precise displayed.The research starting point of the Subject is discrete contour data, which is derived from a medical CT image through image segmentation and contour extraction. Firstly, according to the relatively dense characteristics of contour line data, an improved line segment approximation method based on the polymerization minimum mean-square deviation is used in the context of maintaining the characteristics information of original data to make data compressed and streamlined. According to the modeling target and the characteristics of contour data, an improved three-dimensional modeling algorithm based on the traditional contour method in surface rendering is proposed. The contour data is divided into separate classes through threshold and nested relationship in order to avoid the modeling errors led by inter-class operation, then corresponding process is done in divided class, the paper has used a combination of global and local method to complete the contour mapping process so that corresponding relationship between the adjacent fault contours is more reasonable. As one-to-many contour corresponding group in corresponding process occurs, the decomposition contour method is selected for its branch processing, that is, the decomposition of a single contour line according to the many corresponding contour positions and the decomposition is mapped one to one. After the above steps the adjacent fault only has one to one corresponding relationship. The minimal diagonal as optimization objectives of stitching path is used in this subject, the triangular patches is adopt to splice contour which takes the contour data points as vertices, and then the three-dimensional digital modeling of the body tissue and organ is completed.Visual C ++6.0 is selected as development tool, combined with OpenGL technology to develop and design a three-dimensional digital modeling system based on the data of human tissue and organ. The system includes data pre-processing and 3D-reconstruction modules, and by calling the OpenGL functions, the model visualization is achieved. The application of modeling examples can verify the algorithm is more accurate and efficient to complete three-dimensional digital modeling of the human tissue and organ and the three-dimensional digital model can reasonably express the internal structural information of organ.