Two image mapping algorithms of the volume rendering , forward mapping and backward mapping are researched on the basis of optical model for volume rendering . combined with the characteristic of a series of section images from laser confocal scanning microscopy , the volume buffer algorithm and maximizing algorithms are proposed in this paper . 4 同时在探讨体绘制光学模型的基础上，研究了体绘制的两种图像合成算法，即由前向后算法和由后向前算法，并结合激光共聚焦扫描显微成像系统序列断层荧光图像的特点提出了体缓冲器算法和最大值算法。
The narrow fan - beams are reset into parallel beam then the image reconstruction is conducted by parallel beam " convolution back projection algorithm , which combines the high scan efficiency with the convenience of image reconstruction . this paper analyses the parallelism in narrow fan - beam " convolution back projection algorithm , divides the task of image reconstruction into several subtasks , and discusses the parallelization of narrow fan - beam " decomposition and reset , parallel beam " convolution back projection , and image accumulation 对于窄角扇束扫描方式，把窄角扇束重排成平行束，再由平行束卷积反投影重建算法来重建图像，是把扫描的高效率和重建方式的简便易行很好的结合起来。本论文对窄角扇束卷积反投影算法进行了并行性分析，指出把图像重建任务分解为多个子任务并行工作，并在工作站机群上讨论了窄角扇束的分解、重排、平行束卷积反投影图像重建、图像合成的并行实现。
