文物CT图像伪影校正方法研究

Research on the artifact correction of CT images of cultural relics

计算机断层成像(CT)技术具有不受工件材质限制、分辨率高等优点,可以在不损坏物体的前提下获取其三维数字化信息,因此在文物数字化领域具有广阔的应用前景和巨大的发展潜力。然而在CT扫描与图像重建过程中存在系统几何参数偏差与射线硬化等问题,会导致扫描图像质量下降、文物数字化模型的精度受限。本研究针对上述问题,提出了基于扫描数据的参数校准以及硬化校正算法,并对两件文物仿制品进行了CT扫描实验。实验结果表明,经过本研究方法处理后,扫描图像质量明显提升,重影和伪影现象得到了有效抑制,重建得到的数字化模型能清晰完整地还原文物形貌。该方法可被广泛应用于文物CT数字化工作中,有利于文物的复制、保护、展示以及文化的交流传播,具有较强的科学意义和社会经济意义。

Computed tomography(CT)technology has the advantages of high resolution without the limitation of work piece materials and can obtain its three-dimensional digital information without damaging an object.Therefore,it has broad application prospects and great potential for development in the field of cultural relic digitization.However,in the process of CT scanning and image reconstruction,there are some problems including system geometric parameter deviation and ray hardening,which will lead to the decline of the quality of scanning images and the limitation of the accuracy of digital models of cultural relics.In order to solve these problems,we propose a parameter calibration and hardening correction algorithm based on scanning data,and carried out CT scanning experiments on two cultural relic replicas in our study.The experimental results show that the quality of the scanning images is significantly improved,the phenomena of ghosting and artifact are effectively suppressed,and the reconstructed digital models can clearly and completely restore the morphology of the objects.This method can be widely used for the CT digitization of cultural relics,which is conducive to the replication,conservation and display of cultural relics and the communication of cultures.It has strong scientific and social economic significance.