Ferrucci, M; Ametova, E*; Carmignato, S*; DeWulf, W* (2016) Evaluating the effects of detector angular misalignments on simulated computed tomography data. Precision Eng., 45. pp. 230-241.

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Abstract

The quality of dimensional measurements made by industrial X-ray computed tomography (CT) depends on a variety of influence factors in the measurement process. In this paper, the effects of angular misalignments of a flat-panel detector are investigated. First, a forward projection model is applied to evaluate distortions of the radiographic pixel coordinates assigned to X-ray intensities due to various detector rotation angles. Distortion maps are presented for a set of representative detector rotations and the sensitivity of image distortions to each rotation is discussed. Subsequently, CT scans of a test object are simulated in the presence of angular detector misalignments, and volumetric deviations from a scan under ideal geometry are evaluated. Commercial software Scorpius XLab® is used for simulating CT data. The volumetric results can be used to inform the future development of a suitable reference object for estimating detector misalignments in a test system. Finally, the distortion model is inversely applied to generate correction maps that are used to correct the radiographs simulated with a misaligned detector. A new volume is reconstructed from the corrected radiographs and the new deviations are compared to the uncorrected results.

Item Type:	Article
Subjects:	Engineering Measurements Engineering Measurements > Dimensional
Identification number/DOI:	10.1016/j.precisioneng.2016.03.001
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/7093

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