| Stair-step artifacts with single versus multiple detector-row helical CT. | |
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MedLine Citation:
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PMID: 10887247 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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PURPOSE: To compare the effects of acquisition parameters on the magnitude and appearance of artifacts between single and multiple detector-row helical computed tomography (CT). MATERIALS AND METHODS: A cylindric (12.7 x 305.0-mm) acrylic rod inclined 45 degrees relative to the z axis was scanned at the isocenter and 100 mm from the isocenter with single detector-row (single-channel) helical CT (beam width, 1-10 mm; pitch, 1.0, 2.0, or 3.0) and multiple detector-row (four-channel) helical CT (detector width, 1. 25, 2.5, 3.75, and 5 mm; pitch, 0.75 or 1.5). The SD of radius measurements along the rod (SD(r)) was used to quantify artifacts in all 72 data sets and to analyze their frequency patterns. Volume-rendered images of the data sets were ranked by six independent and blinded readers; findings were correlated with acquisition parameters and SD(r) measurements. RESULTS: SD(r) was smaller in four- than in single-channel helical CT for any given table increment (TI). In single-channel helical CT, SD(r) increased linearly with beam width and geometrically with pitch. In four-channel helical CT, SD(r) measurements were directly proportional to the TI, regardless of the detector width and pitch combination used. Off-center object position on average increased SD(r) by a factor of 1.6 for single-channel helical CT and by a factor of 2.0 for four-channel helical CT. Subjective rankings of image quality correlated excellently with SD(r) (Spearman r = 0.94, P <.001). CONCLUSION: Artifacts are quantitatively and subjectively smaller with four- compared with single-channel helical CT for any given TI. |
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Authors:
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D Fleischmann; G D Rubin; D S Paik; S Y Yen; P R Hilfiker; C F Beaulieu; S Napel |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Radiology Volume: 216 ISSN: 0033-8419 ISO Abbreviation: Radiology Publication Date: 2000 Jul |
Date Detail:
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Created Date: 2000-07-27 Completed Date: 2000-07-27 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0401260 Medline TA: Radiology Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 185-96 Citation Subset: AIM; IM |
Affiliation:
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Department of Radiology, Stanford University School of Medicine, 300 Pasteur Dr, S-072 Stanford, CA 94305-5105, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Phantoms, Imaging Tomography, X-Ray Computed* / methods |
| Grant Support | |
ID/Acronym/Agency:
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R01 CA 72023/CA/NCI NIH HHS; R01 HL 58915/HL/NHLBI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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