Poster Open Access

Implementing an exact algorithm for Helical CT:Removing the cone-beam artefacts

Moe, Yngve M.; Lloyd, Ryan; Tregidgo, Henry; Coban, Sophia B.; Gajjar,Parmesh; Behnsen, Julia; Turner, Martin; Lionheart, William R.B.


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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.61409", 
  "title": "Implementing an exact algorithm for Helical CT:Removing the cone-beam artefacts", 
  "issued": {
    "date-parts": [
      [
        2016, 
        9, 
        2
      ]
    ]
  }, 
  "abstract": "<p>3-dimensional computerised tomography is usually reconstructed using the na\u00efve Feldkamp-Davis-Kress algorithm or FDK, which is not an exact reconstruction algorithm. This caus-<br>\nes image errors, or artefacts that appear out of the central slice, and are especially visible near edges between horizontal layers - this is demonstrated in Figure 1.<br>\nTo overcome these artefacts; one can perform multiple scans at different heights and combine the reconstructed volumes. However, exact reconstruction methods are necessary to<br>\nremove them altogether. These algorithms will also reduce the scanning time which makes them very attractive. Such methods exist, and Alexander Katsevich provided an algo-<br>\nrithm already in 2002[1]. His algorithm uses a helical scan-geometry, rotating the X-Ray source while moving it in parallel with the rotation axis - or, equivalently, scanning the ob-<br>\nject while rotating it and moving it parallel to its rotation axis. In this poster, we demonstrate that it is possible to perform and reconstruct such scans, with a Nikon XTEK scanner<br>\ndesigned for circular scans.</p>", 
  "author": [
    {
      "family": "Moe, Yngve M."
    }, 
    {
      "family": "Lloyd, Ryan"
    }, 
    {
      "family": "Tregidgo, Henry"
    }, 
    {
      "family": "Coban, Sophia B."
    }, 
    {
      "family": "Gajjar,Parmesh"
    }, 
    {
      "family": "Behnsen, Julia"
    }, 
    {
      "family": "Turner, Martin"
    }, 
    {
      "family": "Lionheart, William R.B."
    }
  ], 
  "type": "graphic", 
  "id": "61409"
}
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