“虚拟中国人”(VCH)数据采集技术研究

Data collecting technology on Virtual Chinese Human

目的 :为 863项目“数字化虚拟人体若干关键技术”提供人体切片建模数据采集所涉及的多项综合技术。方法 :对“虚拟中国人”(VirtualChineseHuman ,VCH)铣削加工设备的标准构件进行调研基础上 ,提出新的设计和组装方案 ,确定工艺路线 ,实施调试。结果 :与国际上现已报道的VHP和VKH两个数据集相比 ,新研制装置将卧姿固定和切削 ,改为立姿固定和切削 ;采取工作台上直接冻存 ,改进了异地冻存多次装夹所造成的数据丢失 ;构建了以往没能重点显示的血管系统 ;将切削间距精度由 0 .3 3mm和 0 .2mm提高到 0 .1mm .。结论 :“虚拟中国人”的数据采集技术 ,有更高精度、更便于操作、更真实的血管显示。

Objective: To explore new techniques of data collecting for the Virtual Chinese Human (VCH), one of the key national scientific projects in China. Methods: New techniques were conceived on the basis of a careful study of the current Chinese processing equipment available for the VCH. Compared with VHP and VKH data collecting, in this experiment the cadaveric specimen was fixed and frozen in standing posture instead of in lying posture, serial-sectioning was done in refrigerator without moving the cadaver from here to there, the vascular system that had not been displayed clearly enough in the other projects was constructed, and the sectioning accuracy was raised from 0.33 mm to 0.1 mm.Results: The standing posture sectioning technique made the collected data more accurate or closer to the normal anatomical structure. The direct refrigerator sectioning method greatly lessened the data loss. The technique of vascular cast improved the clearness of arteries in the images of VCH. Small pixel size (0.1 mm×0.1 mm) and the thickness (0.1 mm) of sectioned images will be more helpful in showing the small anatomical structures that are greater than 0.1 mm in diameter. Conclusion: The new techniques can improve the accuracy of the sectioned images so as to be more helpful in making the complete 3D images for the VCH.