Abstract: Graphics card based rendering, hardware supported tri-linear interpolation, lossless texture character of the raw images, these three strong points make 3D texture-based volume rendering especially suitable for real-time 3D visualization of ultrasound data. The calculating speed of large number of slice polygon coordinates is a bottleneck of real-time rendering performance. In order to overcome the defect of the often-used parameterized method which is unable to generate large amount of slice polygons quickly, this paper introduces a space-active-edge-list (SAEL) method that takes the advantage of space coherence among slice polygons using incremental calculation, speeds the calculation.

Key words: Volume rendering; 3D texture; Slice polygon; 3D ultrasound

摘要： 三维纹理的体绘制算法由于其利用显卡加速渲染、硬件实现三线性插值和不丢失图像的纹理特性3 大优点，尤其适合医学超声数据的实时三维可视化。显示大量多边形切片(slice polygon)是当前影响三维纹理体绘制渲染实时性的重要因素。为了克服常用的参数化算法在快速生成大量多边形切片时性能不佳的缺点，提出了的空间活动边表的方法，充分利用各个多边形切片之间的空间相关性实现增量计算，明显提高了计算速度

关键词: 体绘制；三维纹理；多边形切片；三维心脏超声