| Usefulness of dual-energy CT scanning at 80 kVp for identifying hilar and mediastinal structures: evaluation of contrast enhancement of the pulmonary vessels and lymph nodes. | |
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MedLine Citation:
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PMID: 22139758 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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PURPOSE: We examined whether the 80-kVp CT images scanned at 100 s after contrast material injection using a dual-source scanner could be substituted for the conventional 120-kVp images obtained at an earlier timing of 30 s. MATERIALS AND METHODS: Seventy-eight patients with suspected lung cancer were examined with a 120-kVp mode at 30 s after contrast material injection (early phase) and a dual-energy (80 and 140 kVp) mode at 100 s (late phase). CT numbers of the pulmonary artery (PA), pulmonary vein (PV) and hilar zone lymph nodes (LN) were measured. Contrast between the PA/PV and LN was visually evaluated using a 5-point scale. Beam-hardening artifacts were also visually assessed. RESULTS: The mean difference in attenuation between the PA/PV and LN on the early phase 120-kVp, late phase 80-kVp and late phase weighted-average 120-kVp images was 171.3/160.8, 100.5/106.8 and 67.5/67.5, respectively (p < 0.001). The mean contrast score of these three images for the hilar/mediastinal LN was 4.5/4.7, 3.4/3.8 and 2.9/3.3, respectively (all p < 0.05). The mean artifact score of the three images was 2.6, 4.0 and 4.0, respectively; on most early phase images, the beam-hardening artifacts influenced the diagnosis (p < 0.001). CONCLUSION: The late phase 80-kVp images showing few artifacts may be an alternative to early phase 120-kVp images. |
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Authors:
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Ayano Imafuji; Masaki Hara; Shigeru Sasaki; Toshinao Arakawa; Yoshiyuki Ozawa; Yuta Shibamoto |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-3 |
Journal Detail:
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Title: Japanese journal of radiology Volume: - ISSN: 1867-108X ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-5 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101490689 Medline TA: Jpn J Radiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Radiology, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-cho, Mizuho-ku, Nagoya, Aichi, 467-8601, Japan, ayanokushita@hotmail.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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