| The cause of the artifact in 4-slice helical computed tomography. | |
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MedLine Citation:
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PMID: 15305455 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The causes of the image artifacts in a 4-slice helical computed tomography have been discussed as follows: (1) changeover in pairs of data used in z interpolation, (2) sampling interval in z, and (3) the cone angle. This study analyzes the first two causes of the artifact and describes how the current algorithm [K. Taguchi and H. Aradate, Radiology 205P, 390 (1997); 205P, 618 (1997); Med. Phys. 25, 550-561 (1998); H. Hu, ibid. 26, 5-18 (1999); S. Schaller et al., IEEE Trans. Med. Imaging 19, 822-834 (2000); K. Taguchi, Ph.D. thesis, University of Tsukuba, 2002] solves the problem. An interpolated sinogram for a slice at the edge of a ball phantom shows discontinuity caused by the changeover. If we extend the streak artifact in the reconstructed image, it crosses the focus orbit at the corresponding projection angle. Applying z filtering can reduce such causes by its feathering effect and mixing data obtained by different cone angles; the best results are provided when z filtering is applied to densely sampled helical data. |
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Authors:
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Katsuyuki Taguchi; Hiroshi Aradate; Yasuo Saito; Ilan Zmora; Kyung S Han; Michael D Silver |
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Publication Detail:
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Type: Comparative Study; Evaluation Studies; Journal Article; Validation Studies |
Journal Detail:
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Title: Medical physics Volume: 31 ISSN: 0094-2405 ISO Abbreviation: Med Phys Publication Date: 2004 Jul |
Date Detail:
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Created Date: 2004-08-12 Completed Date: 2005-01-11 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: 2033-7 Citation Subset: IM |
Affiliation:
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CT Systems Development Department, Toshiba Medical Systems Corporation, 1385 Shimoishigami, Otawara, Tochigi 324-8550 Japan. ktaguchi@aol.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms* Anatomy, Cross-Sectional / methods* Artifacts* Imaging, Three-Dimensional / methods* Radiographic Image Enhancement / methods* Radiographic Image Interpretation, Computer-Assisted / methods* Reproducibility of Results Sensitivity and Specificity Tomography, Spiral Computed / methods* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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