| Pitch dependence of longitudinal sampling and aliasing effects in multi-slice helical computed tomography (CT). | |
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MedLine Citation:
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PMID: 12200940 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In this work, we investigate longitudinal sampling and aliasing effects in multi-slice helical CT. We demonstrate that longitudinal aliasing can be a significant, complicated, and potentially detrimental effect in multi-slice helical CT reconstructions. Multi-slice helical CT scans are generally undersampled longitudinally for all pitches of clinical interest, and the resulting aliasing effects are spatially variant. As in the single-slice case, aliasing is shown to be negligible at the isocentre for circularly symmetric objects due to a fortuitous aliasing cancellation phenomenon. However, away from the isocentre, aliasing effects can be significant, spatially variant, and highly pitch dependent. This implies that measures more sophisticated than isocentre slice sensitivity profiles are needed to characterize longitudinal properties of multi-slice helical CT systems. Such measures are particularly important in assessing the question of whether there are preferred pitches in helical CT. Previous analyses have generally focused only on isocentre sampling patterns, and our more global analysis leads to somewhat different conclusions than have been reached before, suggesting that pitches 3, 4, 5, and 6 are favourable, and that half-integer pitches are somewhat suboptimal. |
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Authors:
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Patrick J La Rivière; Xiaochuan Pan |
Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Physics in medicine and biology Volume: 47 ISSN: 0031-9155 ISO Abbreviation: Phys Med Biol Publication Date: 2002 Aug |
Date Detail:
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Created Date: 2002-08-30 Completed Date: 2003-03-20 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0401220 Medline TA: Phys Med Biol Country: England |
Other Details:
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Languages: eng Pagination: 2797-810 Citation Subset: IM |
Affiliation:
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Department of Radiology, University of Chicago, 5841 S Maryland Avenue, MC-1037, Chicago, IL 60637, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts Computer Simulation* Imaging, Three-Dimensional / methods* Models, Statistical Phantoms, Imaging Radiographic Image Enhancement / methods* Reproducibility of Results Sample Size Sensitivity and Specificity Tomography, Spiral Computed / instrumentation, methods* |
| 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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