| PI-line-based image reconstruction in helical cone-beam computed tomography with a variable pitch. | |
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MedLine Citation:
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PMID: 16193794 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Current applications of helical cone-beam computed tomography (CT) involve primarily a constant pitch where the translating speed of the table and the rotation speed of the source-detector remain constant. However, situations do exist where it may be more desirable to use a helical scan with a variable translating speed of the table, leading a variable pitch. One of such applications could arise in helical cone-beam CT fluoroscopy for the determination of vascular structures through real-time imaging of contrast bolus arrival. Most of the existing reconstruction algorithms have been developed only for helical cone-beam CT with constant pitch, including the backprojection-filtration (BPF) and filtered-backprojection (FBP) algorithms that we proposed previously. It is possible to generalize some of these algorithms to reconstruct images exactly for helical cone-beam CT with a variable pitch. In this work, we generalize our BPF and FBP algorithms to reconstruct images directly from data acquired in helical cone-beam CT with a variable pitch. We have also performed a preliminary numerical study to demonstrate and verify the generalization of the two algorithms. The results of the study confirm that our generalized BPF and FBP algorithms can yield exact reconstruction in helical cone-beam CT with a variable pitch. It should be pointed out that our generalized BPF algorithm is the only algorithm that is capable of reconstructing exactly region-of-interest image from data containing transverse truncations. |
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Authors:
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Yu Zou; Xiaochuan Pan; Dan Xia; Ge Wang |
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Publication Detail:
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Type: Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Medical physics Volume: 32 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 2005 Aug |
Date Detail:
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Created Date: 2005-09-30 Completed Date: 2005-10-27 Revised Date: 2007-11-14 |
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: 2639-48 Citation Subset: IM |
Affiliation:
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Department of Radiology, The University of Chicago, Chicago, Illinois 60637, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms* Imaging, Three-Dimensional / methods* Phantoms, Imaging Radiographic Image Enhancement / methods Radiographic Image Interpretation, Computer-Assisted / methods* Reproducibility of Results Sensitivity and Specificity Tomography, Spiral Computed / instrumentation, methods* |
| Grant Support | |
ID/Acronym/Agency:
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EB00225/EB/NIBIB NIH HHS; EB004287/EB/NIBIB NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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