The transepicondylar axis of different position has no effect on volume rendering technique measuring the humeral head retroversion angle with multi slice spiral CT.
肱骨远端不同位置内外上髁轴线对多层螺旋CT容积再现测量肱骨头扭转角没有影响；
During volume rendering, gradient will be used both on the procedure Classification and Shading. So rapidity and accuracy of gradient estimation is important to high quality rendering algorithm.
体绘制流程中，梯度在数据分类和明暗计算中都要用到，因此快速准确的梯度估算对高质量的体绘制算法至关重要。
The speed of volume rendering is the bottleneck of interactive visualization.
体数据的绘制速度是交互可视化的瓶颈。
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