| Optimal pitch in spiral computed tomography. | |
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MedLine Citation:
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PMID: 9350718 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The focus of this paper is to analytically optimize spiral/helical computed tomography (CT) protocols based on a simplified imaging model. Spiral CT was approximately modeled as follows: Using the half-scan raw data interpolation method, the variance of the spiral CT slice sensitivity profile is equal to the sum of squared detector collimation divided by 12 and squared table increment divided by 24. Image noise variance is inversely proportional to tube current and detector collimation. The maximum continuous scanning time is inversely proportional to tube current. Slice thickness, image noise, and signal-to-noise ratio were, respectively, optimized for a given scanning coverage, consistently resulting in pitch of square root of 2. To avoid longitudinal aliasing, at least 2-3 transverse slices should be reconstructed per collimation. When the simplified spiral CT model is valid and a scanning range specified, 1.4 pitch is required for optimal image quality. The method can be applied to more accurate spiral CT models. |
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Authors:
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G Wang; M W Vannier |
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Publication Detail:
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Type: 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: Medical physics Volume: 24 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 1997 Oct |
Date Detail:
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Created Date: 1998-01-06 Completed Date: 1998-01-06 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 0425746 Medline TA: Med Phys Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1635-9 Citation Subset: IM |
Affiliation:
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Department of Radiology, University of Iowa, Iowa City 52242, USA. ge-wang@uiowa.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biophysical Phenomena Biophysics Humans Models, Theoretical Radiographic Image Interpretation, Computer-Assisted / methods Technology, Radiologic Tomography, X-Ray Computed / methods*, statistics & numerical data |
| Grant Support | |
ID/Acronym/Agency:
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R03 DC02798/DC/NIDCD NIH HHS; R29 DK50184/DK/NIDDK NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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