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The Application of Voxel Size Correction in X-ray Computed Tomography for Dimensional Metrology
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lifton, Joseph J. McBride, John W. |
| Copyright Year | 2013 |
| Abstract | X-ray computed tomography (CT) is a non-destructive, radiographic scanning technique that enables the visualisation and dimensional evaluation of both internal and external features of a workpiece; it is therefore an attractive alternative for measurement tasks that prove problematic for conventional tactile and optical instruments. The data output of a CT measurement is a volume of grey value integers that describe the material distribution of the scanned workpiece; the relative spacing of volume-elements (voxels) is termed voxel size and influences all dimensional information evaluated from a CT data-set. Voxel size is defined by the position of a workpiece relative to the X-ray source and detector, and is therefore prone to axis position errors, errors in the geometric alignment of the CT system’s hardware, and the positional drift of the X-ray focal spot. In this work a method is presented for calculating a voxel scaling factor that corrects for voxel size errors, and this method is then applied to a general X-ray CT measurement task and demonstrated to reduce measurement errors. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.ndt.net/article/SINCE2013/content/papers/24_Lifton.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
