中文摘要：

在进行三维适形放射治疗计划时，需要运用三维医学可视化技术获取有关病灶区的三维视觉信息并确定靶区．为此，文中开发了用于三维适形放射治疗计划的三维可视化系统，该系统包括图像分割、多模态图像配准与融合、三维重建、识别和勾画靶区等功能模块．系统采用基于小波变换的融合方法，以区域标准差与区域能量相结合的融合规则实现多模图像的融合，并基于改进的Shear—Warp算法快速实现体绘制．实验证明，该三维可视化系统满足三维适形放射治疗计划中的可视化要求．

英文摘要：

In a 3D conformal radiotherapy treatment （3D CRT） planning, the 3D visualization technology is necessary to the acquiring of 3D visual information and to the target determination. This paper develops a 3D visualization system of the 3D CRT planning. In the system consisting of the function modules such as image segmentation, muhi-modality image registration and fusion, 3D reconstruction, 3D recognition and target contour delineation, the fusion of muhi-modality image is realized by means of the wavelet transform-based fusion method and the fusion rule through the combination of the local standard deviation and the local energy, and the volume rendering of 3D images is rapidly implemented via the improved Shear-Warp method. Experimental results demonstrate that the proposed system helps to well implement the visualization in 3D CRT planning.