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Standards Development
This document specifies requirements and recommendations to be followed prior to carrying out dimensional measurements on three-dimensional (3D) volumetric X-ray Computed Tomographic (XCT) data of additive manufacturing (AM) series production parts. It is applicable to cone beam XCT systems. However, these requirements and recommendations can be transposed to non-medical fan beam XCT systems, but they are limited to standard XCT trajectories (circular and helical) and standard reconstructions.The proposed methodology in this document is restricted to the qualification and validation of an XCT system prior to proceeding to dimensional measurements on specific AM series production parts and cannot be generalised to any application.This document provides a method to evaluate XCT dimensional measurement accuracy. However, it does not claim to provide a definitive method, given the complexity of an XCT process. For the same reason, it is addressed to qualified XCT operators with the support of metrology experts.This document is dedicated to AM series production parts and its aim is to provide a methodology for controlling the geometric specificities associated with AM (internal shapes, lattice structures). It is applicable on parts that are fabricated by any type of AM categories of processes and material provided the X-ray penetration lengths are sufficient to scan the test part.
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