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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    "description": "<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>", 
    "license": {
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    "title": "Implementing an exact algorithm for Helical CT:Removing the cone-beam artefacts", 
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    "references": [
      "Alexander Katsevich. Theoretically exact filtered backprojection-type inversion algorithm for spiral CT. SIAM Journal on Applied Mathematics, 62(6):2012\u20132026, 2002.", 
      "Henry F.J. Tregidgo. The Implementation and analysis of Katsevich Reconstruction for helical CT. MSc. thesis, The University of Manchester, 2013.", 
      "Adam. J. Wunderlich. The Katsevich Inversion Formula for Cone-Beam Computed Tomography. MSc. dissertation, Oregon State University, 2006.21"
    ], 
    "keywords": [
      "helical scan", 
      "cone beam CT", 
      "Katsevick", 
      "Nikon Xtek", 
      "artefacts"
    ], 
    "publication_date": "2016-09-02", 
    "creators": [
      {
        "affiliation": "University of Manchester", 
        "name": "Moe, Yngve M."
      }, 
      {
        "name": "Lloyd, Ryan"
      }, 
      {
        "name": "Tregidgo, Henry"
      }, 
      {
        "name": "Coban, Sophia B."
      }, 
      {
        "name": "Gajjar,Parmesh"
      }, 
      {
        "name": "Behnsen, Julia"
      }, 
      {
        "name": "Turner, Martin"
      }, 
      {
        "name": "Lionheart, William R.B."
      }
    ], 
    "meeting": {
      "acronym": "ToScA", 
      "url": "http://www.nhm.ac.uk/our-science/departments-and-staff/core-research-labs/imaging-and-analysis-centre/tosca.html", 
      "dates": "6-7 September 2016", 
      "place": "Bath, UK", 
      "title": "Tomography for Scientific Advancement"
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