< back to main site

Publications

Evaluating the effects of detector angular misalignments on simulated computed tomography data.

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.

Full text not available from this repository.

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

Actions (login required)

View Item View Item