Three-dimensional Reconstruction Of Medical Images And Real-time Cutting Technology Research,

This dissertation, mostly studies the technology of three-dimensional reconstruction and clipping from medical images and the application of three-dimensional clipping. Three-dimensional reconstruction from medical images is a multi-disciplinary subject. It is an important application of computer graphics and image processing in biomedicine engineering. It relates to the subjects of digital image processing, computer graphics and some related knowledge of medical. Three-dimensional reconstruction and visualization of medical images are widely used in diagnostic, surgery planning and simulating, plastic and artificial limb surgery, and teaching in anatomy. Volume clipping palys a decisive role in understanding three-demensional volumetric data sets because it allow us to cut away selected parts of the volume based on the position of voxels in the data set. Very ofen, clipping is the only way to uncover important, otherwise hidden details of a data set. So study on three-dimensional reconstruction and clipping from medical images, espesically three-demensional clipping in real-time has important significance on science and worthiness in practical application.This paper focuses on the study in three aspects:1. An efficient method of volume rendering based on genetic algorithm is proposed. This thesis analyse physical nature of genetic algorithm firstly, it is a family of computational models inspired by evolution and has the advantage of finding the fittest result automatically and quickly. So because of the similar gray value in neighboring voxels, genetic algorithm is used to render all the nonempty voxels and proximity clouds is adopted to leap all the empty voxels. Experimental results demonstrate that our method is satisfactory and is efficient enough to meet the demands of realistic and real time in volume rendering.2. Research on the technology of three-dimensional reconstruction and clipping.Firstly a sequence of two-demensional medical images is rebuilt by VTK, and then we can operate on it. In this thesis we research on three-demensional clipping chiefly. At last the clipping with no more than six planes, clipping with arbitrary planes and clipping with normal cubicity are put into practice.3. At last, precise measurement based on three-demensional clipping is proposed. In this method we introduce a clipping pane which is vertical with Z axis to lock depth-information of three-demensional measurement which is different from troditional measurement, and we also create a clipping buffer to store the values of three-demensional coordinates. In this way we can accomplish three-demensional measurement by using three-demensional clipping and rotation.