| Longitudinal aliasing in multislice helical computed tomography: sampling and cone-beam effects. | |
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MedLine Citation:
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PMID: 12575873 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this study, we examine longitudinal aliasing properties in multislice helical computed tomography (CT) volumes reconstructed under the multiple parallel fanbeam approximation by use of a 180LI-type algorithm. We focus on the differences between the multislice case and the single-slice case, which has been studied previously. Specifically, we examine longitudinal aliasing properties in four-slice scanners for helical pitches 3 and 6, which are sometimes called "preferred" in four-slice helical CT, because it is believed that the effective longitudinal sampling intervals at these pitches are equivalent to those in single-slice helical CT operating at pitches 1 and 2, respectively. While these equivalences have been supported by comparative studies of slice-sensitivity profiles in single- and multislice helical CT, artifacts have been observed in pitch-3 and pitch-6 multislice images that were not evident in their purported single-slice counterparts. We attribute these differences to aliasing arising in the multislice reconstructions that is not present in the single-slice counterparts. We find that the aliasing has two principal origins: sampling effects similar to those in the single-slice case and cone-beam effects. The difference between the multislice, pitch-3 and single-slice, pitch-1 results is attributed to the small cone angle in multislice helical CT, which introduces inconsistencies among the measurements of different detector rows. The difference between multislice, pitch-6 and single-slice, pitch-2 results is attributed to a combination of the cone angle and genuine differences in sampling patterns. It is argued, however, that the lack of strict equivalence with single-slice counterparts does not necessarily undermine the claim that pitches 3 and 6 are "preferred" relative to other pitches in multislice helical CT. |
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Authors:
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Patrick J La Rivière; Xiaochuan Pan |
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Publication Detail:
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Type: Comparative Study; Evaluation Studies; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: IEEE transactions on medical imaging Volume: 21 ISSN: 0278-0062 ISO Abbreviation: IEEE Trans Med Imaging Publication Date: 2002 Nov |
Date Detail:
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Created Date: 2003-02-10 Completed Date: 2003-05-23 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8310780 Medline TA: IEEE Trans Med Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 1366-73 Citation Subset: IM |
Affiliation:
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Department of Radiology, University of Chicago, 5841 S. Maryland Ave., MC-1037, Chicago, IL 60637, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Equipment Failure Analysis* Phantoms, Imaging Quality Control Reproducibility of Results Sample Size* Sensitivity and Specificity Tomography, Spiral Computed / instrumentation* |
| Grant Support | |
ID/Acronym/Agency:
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CA70449/CA/NCI NIH HHS; EB00225/EB/NIBIB NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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