X-ray computed tomography instrument performance evaluation: Detecting geometry errors using a calibrated artifact

摘要

X-ray computed tomography (XCT) is uniquely suitable for non-destructive dimensional measurements of delicate orinternal features produced, for example, by additive manufacturing. While XCT has long been used in medical imaging,it has been used for industrial dimensional measurements only in recent years. The error sources in XCT of industrialcomponents is still a topic of active research. One subgroup of potential error sources in XCT measurements areuncorrected XCT instrument geometry errors, such as detector misalignment or rotation stage errors, and are the focus ofthis paper. We demonstrate the effect of some instrument geometry errors on measurements performed on a calibratedartifact and compare the results to those obtained through simulations. The overall objective of this work is to supportongoing efforts to develop documentary national and international standards for performance evaluations of XCTinstruments. In this study, we focus on cone-beam XCT instruments.