The X-ray computed tomography system (XCT) as a coordinate measuring system has been increasingly introduced into the manufacturing industry because of its capability of measuring internal features. However, the metrological performance evaluation method for XCT has not yet been standardized. One of the biggest reasons of this is the difficulty in evaluating the material influence. The previous research by the authors revealed that the material influence significantly affects the form of the object to be measured. ISO/TC 213/WG 10, which covers the ISO standards of coordinate measuring machines, proposes the introduction of an additional object, called an “obstructive body,” by which the material influence is enhanced. This study presents the experimental results and a software simulation, in which the material influence is produced in a specific area and not on the entire surface of the test object. Additionally, requirements for the obstructive body in the industrial standardization of performance evaluation methods for XCT are proposed.

X射线计算机断层扫描系统（XCT）作为一种坐标测量系统，因其能够测量内部特征而越来越多地引入制造业。然而，XCT的计量性能评价方法尚未标准化。造成这种情况的最大原因之一是难以评估物质影响。作者之前的研究表明，物质影响对被测物体的形状有显着影响。ISO/TC 213/WG 10 涵盖了坐标测量机的 ISO 标准，建议引入一个额外的物体，称为“阻塞体”，通过它可以增强材料的影响。本研究展示了实验结果和软件模拟，其中材料影响是在特定区域而不是在测试对象的整个表面上产生的。此外，提出了XCT性能评价方法行业标准化中对障碍物的要求。