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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    <subfield code="x">Alexander Katsevich. Theoretically exact filtered backprojection-type inversion algorithm for spiral CT. SIAM Journal on Applied Mathematics, 62(6):2012–2026, 2002.</subfield>
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    <subfield code="x">Henry F.J. Tregidgo. The Implementation and analysis of Katsevich Reconstruction for helical CT. MSc. thesis, The University of Manchester, 2013.</subfield>
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    <subfield code="a">Implementing an exact algorithm for Helical CT:Removing the cone-beam artefacts</subfield>
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    <subfield code="a">&lt;p&gt;3-dimensional computerised tomography is usually reconstructed using the naïve Feldkamp-Davis-Kress algorithm or FDK, which is not an exact reconstruction algorithm. This caus-&lt;br&gt;
es 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.&lt;br&gt;
To overcome these artefacts; one can perform multiple scans at different heights and combine the reconstructed volumes. However, exact reconstruction methods are necessary to&lt;br&gt;
remove them altogether. These algorithms will also reduce the scanning time which makes them very attractive. Such methods exist, and Alexander Katsevich provided an algo-&lt;br&gt;
rithm 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-&lt;br&gt;
ject 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&lt;br&gt;
designed for circular scans.&lt;/p&gt;</subfield>
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