| Comparison of helical and cine acquisitions for 4D-CT imaging with multislice CT. | |
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MedLine Citation:
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PMID: 15789609 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We proposed a data sufficiency condition (DSC) for four-dimensional-CT (4D-CT) imaging on a multislice CT scanner, designed a pitch factor for a helical 4D-CT, and compared the acquisition time, slice sensitivity profile (SSP), effective dose, ability to cope with an irregular breathing cycle, and gating technique (retrospective or prospective) of the helical 4D-CT and the cine 4D-CT on the General Electric (GE) LightSpeed RT (4-slice), Plus (4-slice), Ultra (8-slice) and 16 (16-slice) multislice CT scanners. To satisfy the DSC, a helical or cine 4D-CT acquisition has to collect data at each location for the duration of a breathing cycle plus the duration of data acquisition for an image reconstruction. The conditions for the comparison were 20 cm coverage in the cranial-caudal direction, a 4 s breathing cycle, and half-scan reconstruction. We found that the helical 4D-CT has the advantage of a shorter scan time that is 10% shorter than that of the cine 4D-CT, and the disadvantages of 1.8 times broadening of SSP and requires an additional breathing cycle of scanning to ensure an adequate sampling at the start and end locations. The cine 4D-CT has the advantages of maintaining the same SSP as slice collimation (e.g., 8 x 2.5 mm slice collimation generates 2.5 mm SSP in the cine 4D-CT as opposed to 4.5 mm in the helical 4D-CT) and a lower dose by 4% on the 8- and 16-slice systems, and 8% on the 4-slice system. The advantage of faster scanning in the helical 4D-CT will diminish if a repeat scan at the location of a breathing irregularity becomes necessary. The cine 4D-CT performs better than the helical 4D-CT in the repeat scan because it can scan faster and is more dose efficient. |
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Authors:
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Tinsu Pan |
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Publication Detail:
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Type: Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies |
Journal Detail:
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Title: Medical physics Volume: 32 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 2005 Feb |
Date Detail:
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Created Date: 2005-03-25 Completed Date: 2005-06-28 Revised Date: 2006-11-15 |
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: 627-34 Citation Subset: IM |
Affiliation:
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The University of Texas, M D Anderson Cancer Center, Houston, Texas 77030, USA. tpan@mdanderson.org |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Artifacts* Artificial Intelligence Humans Imaging, Three-Dimensional / methods* Movement* Phantoms, Imaging Radiographic Image Enhancement / methods* Radiographic Image Interpretation, Computer-Assisted / methods* Radiotherapy Planning, Computer-Assisted / methods Reproducibility of Results Respiratory Mechanics Sensitivity and Specificity Subtraction Technique* Tomography, Spiral Computed / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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