为了改善平面旋转屏体扫描显示系统中存在的成像空间较小、体素数量较少和体素重叠死区严重等缺陷，系统采用螺旋旋转屏构建体3维显示系统的成像空间。根据螺旋屏旋转构成的成像空间的特点,提出了利用螺旋面的素线和3维模型的三角面片求交的算法生成螺旋切片。该算法根据螺旋旋转屏的不同旋转位置的角度信息，把3维模型离散成有序的螺旋切片序列。实验结果表明，螺旋旋转屏的性能优越以及所提出的算法方便有效。

In order to meliorating defects, such as smaller image space and fewer voxels and severer voxel overlap dead zone caused by planar rotational screen in volumetric-swept display system, the system adopted helix rotation screen to construct an imaging space in volumetric-swept display system. Considering the characteristics of the imaging space, the generation algorithm for helix slices of the 3D model was proposed.It calculated the points of intersection crossed by simple-lines of the helicoids and triangular elements of 3D model and obtained the helix slices. This algorithm dispersed the 3D model into a set of consecutive helix slices according to the angle information of the rotational helix screen. The experimental results showed that the helix rotational screen performance was superior to plane rotational screen, and the proposed algorithm is convenient and effective.