CT多功能检测模体设计与3D打印制作研究

Research on the design of CT multifunctional detection phantom and 3D printing production

目的:设计研制一种用于CT质量控制检测的新型模体,实现CT扫描系统多功能成像性能检测,为国产化CT模体研制提供参考。方法:使用3D打印技术制作模体,与Catphan500模体进行对比实验,并测试包括均匀度、碘密度、金属伪影等参数指标。结果:本研究制作的模体均匀性测量数值为1.695 HU,检测结果相较Catphan500模体的均匀性数值1.71 HU有所改善;其碘密度测量值与真实值之间的均方误差为0.019,Pearson相关系数为1.0,结果相关性显著;金属伪影评价功能结果合理,结果显示在60 keV以上的单能图像以及单能加金属伪影去除算法能够有效抑制金属伪影。结论:本研究所设计的3D打印模体在均匀性方面达到与进口模体功能相近水平,在碘密度测量和金属伪影评价功能方面实现了对传统模体的补充,模体的研制可为医院开展CT质量控制检测提供支持。

Objective:To design and develop a new type of phantom for CT quality control testing,to achieve multifunctional imaging performance testing of CT scanning systems,and to provide reference for the development of domestically produced CT phantom.Methods:The phantom was designed and produced through 3D printing,and comparative experiments were conducted on the 3D printing phantom with the Catphan500 phantom.The testing items included indicators such as uniformity,iodine density,metal artifacts and so on.Results:The uniformity measurement value of the phantom produced in this study was 1.695HU,which was improved compared with that of 1.71HU of the Catphan500 phantom.The mean squared error between the iodine density measurement and the true value was 0.019,and the Pearson correlation coefficient was 1.0,indicating a significant correlation between the results.The results of the metal artifact evaluation function were reasonable,and the results showed that the single-energy images above 60keV and the single-energy plus metal artifact removal algorithm could effectively suppress the metal artifact.Conclusion:The 3D printing phantom designed by this research institute has similar functions as imported phantom in terms of uniformity,and complements traditional phantom in iodine density measurement and metal artifact evaluation.The development of the phantom provides support for hospitals to carry out CT quality control testing.