The 2d medical image can be transformed into the 3d image by surface reconstruction and volume rendering.

通过表面重建和体绘制，可将医学二维图象转化为三维图象。

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The surface rendering extracts isosurface from 3D volume data, and then uses traditional graphical technology to display.

面绘制从三维体数据中抽取物体等值面，通过传统的图形学进行显示；

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Because 3D surface model contains huge number of triangles, a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time.

并对其生成的表面几何模型所包含三角面片数量巨大的问题，提出一种快速有效的三角形边收缩算法进行网格简化，提高了表面模型的绘制速度。

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