Research On 3D Reconstruction Technology Of Brachytherapy Treatment Planning System

Combined with the Scientific and Technological Major Project, this paper conducts a research on 3D visualization technology of image guided Brachytherapy treatment planning system(IGBTPS). Based on the research on image loading, segmentation and 3D reconstruction, a 3D visualization module of the system is designed and developed.Firstly, by putting forward the concept of label images, adjusting the interpolation method and the way to break down the iso-surface in the voxels, this paper refines and improve the Marching Cubes. The proposed method is able to extract multiple thresholds at one-time scansion of the 2D images, which realizes the fast reconstruction of multiple organs. Experiments have proved that the proposed method is better than MC both in speed and quality.Secondly, this paper makes a comparison among the main stream algorithms of volume rendering to estimate which one is most suitable for the IGBTPS. By designing and refining the transfer function of Ray Casting(RC) algorithm, the RC is able to render the 2D pelvis tomography images directly as well as conserve the most dada of the medical image. This paper realizes the RC algorithm by programming. The reconstructed results can meet the need of surgical trajectory design.Thirdly, a 3D visualization module of IGBTPS is developed using the MFC, VTK and ITK. This module is capable to represent reconstructed results of multiple methods and support various interactive ways with the models. The module has been embedded into the integrated IGBTPS system. The reconstructed results have been successfully used in the dose planning module and the surgical navigation module.