Conclusion: the cone artifact in ct image is related to such scanning parameters as pitch and the characters of the scanned objects.
临床照片中，锥形伪影突出表现在边界明显的部位。结论：锥形伪影与螺距和被扫描物属性存在确定关系。
2
The limit pressure angle is related to such factors as offset angle, mean spiral angle, pitchcone angle and mean pitchcone diameter, not to geometrical shape of the tooth surface.
极限压力角受偏置角、大小轮的螺旋角、节锥角和中点的分度圆直径影响，而与齿面的其他参数无关等结论。
3
According to the feature of epicycloid hypoid gear, a new method is proposed to calculate the geometric parameters of pitchcone accurately.