中文摘要：

为了解决医学实体模型制作过程中存在效率低、模型精度失真,对CT扫描、图像处理和实体模型3D打印阶段的关键技术进行了研究。首先分析了CT图像的获取原理,给出不同人体部位合理的CT扫描参数;然后,通过限定阈值和区域增长功能精确分离出待研究的部位,并将CT图像数据转换为STL格式;最后,通过设置合适的3D打印参数并对G代码进行修改,以聚乳酸（PLA）为原料,采用熔融沉积型3D打印机制作出满足要求的医学实体模型。实验结果证明：该方法能在兼顾打印效率的同时提高打印精度,从而实现从CT图像到3D打印模型之间精度的不失真传递。

英文摘要：

In order to solve the problems of low efficiency and model precision distortion in the process of building the medical entity model,the key technologies of the CT scanning,image processing and entity model 3D printing are studied. Firstly,the principle of the CT image is analyzed,then reasonable CT scan parameters of different body parts are given. Subsequently,the accurate part researched is obtained by delimiting the scope of threshold and using the function of regional growth,and the data of CT image are converted to the format of STL. Finally,by setting appropriate parameters and modified the G code,the medical entity model is manufactured using 3D printer of fused deposition modeling（ FDM）,with polylactic acid（ PLA） as raw material. The experimental results show that this method can improve printing efficiency with relatively high printing precision,so as to realize the accurate transfer from CT image to3 D print model.