| Contrast resolution in multidetector-row CT with 16 detector rows: phantom study. | |
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MedLine Citation:
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PMID: 20821158 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study was performed for evaluation of high- and low-contrast resolution in multidetector-row CT (MDCT) with 16 detector rows. For evaluating high-contrast resolution, a phantom was scanned ten times at 100 mA s with 24 patterns of scan parameters under several X-ray beam widths, X-ray tube voltages, X-ray tube rotation times, and helical pitches. Three radiological technologists observed the images visually. For evaluating low-contrast resolution, a phantom was scanned ten times at 100 mA s with the 24 patterns of scan parameters, which were the same as for high-contrast resolution. The images were examined based on receiver operating characteristic (ROC) curves. The high-contrast resolution deteriorated in the off-center locations when helical pitches of 1.375:1 or 1.75:1 were used. High helical pitch (>0.9375:1) and low tube voltage had significant effects on the low-contrast resolution. However, a wide X-ray beam width and short X-ray tube rotation time had no definite influence. Therefore, a helical pitch of 0.5625:1 should be used when the contrast resolutions are really important, and a wide X-ray beam width and short X-ray tube rotation time can improve the temporal resolution without deterioration of contrast resolution. |
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Authors:
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Kosuke Matsubara; Kichiro Koshida; Masayuki Suzuki; Norio Hayashi; Tadanori Takata; Hideo Tsujii; Tomoyuki Yamamoto; Osamu Matsui |
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Publication Detail:
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Type: Evaluation Studies; Journal Article Date: 2007-11-01 |
Journal Detail:
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Title: Radiological physics and technology Volume: 1 ISSN: 1865-0341 ISO Abbreviation: Radiol Phys Technol Publication Date: 2008 Jan |
Date Detail:
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Created Date: 2010-09-07 Completed Date: 2010-12-20 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101467995 Medline TA: Radiol Phys Technol Country: Japan |
Other Details:
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Languages: eng Pagination: 13-9 Citation Subset: IM |
Affiliation:
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Department of Radiological Technology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan. matsuk@rad.m.kanazawa-u.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Phantoms, Imaging* ROC Curve Radiographic Image Interpretation, Computer-Assisted / instrumentation*, methods Time Factors Tomography, X-Ray Computed / instrumentation*, methods |
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