| Usefulness of z-score mapping for quantification of extent of hypoattenuation regions of hyperacute stroke in unenhanced computed tomography: analysis of radiologists' performance. | |
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MedLine Citation:
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PMID: 20861780 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: The purpose of this study was to evaluate the usefulness of z-score mapping method on neuroradiologists' performance in quantification of the extent of hypoattenuation regions of hyperacute stroke on unenhanced computed tomographic (CT) images by using the Alberta Stroke Programme Early CT Score system. METHODS: Twenty-one patients with infarction (<3 hours) were retrospectively selected. Five neuroradiologists interpreted CT images first without and then with z-score maps by using the Alberta Stroke Programme Early CT Score system. Their performances in the quantification of the extent of hypoattenuation were compared. RESULTS: Average accuracies for the quantification without and with the z-score maps were 82.6% and 86.6%, respectively (P < 0.0001). The average area under the receiver operating characteristic curve for detection of focal hypoattenuation significantly increased from 0.883 to 0.925 (P = 0.01) by use of z-score maps. CONCLUSIONS: The use of z-score mapping method has the potential to help neuroradiologists quantify the extent of hypoattenuation regions of hyperacute stroke on unenhanced CT images. |
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Authors:
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Noriyuki Takahashi; Du-Yih Tsai; Yongbum Lee; Toshibumi Kinoshita; Kiyoshi Ishii; Hajime Tamura; Shoki Takahashi |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of computer assisted tomography Volume: 34 ISSN: 1532-3145 ISO Abbreviation: J Comput Assist Tomogr Publication Date: 2010 Sep-Oct |
Date Detail:
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Created Date: 2010-09-23 Completed Date: 2010-10-19 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7703942 Medline TA: J Comput Assist Tomogr Country: United States |
Other Details:
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Languages: eng Pagination: 751-6 Citation Subset: IM |
Affiliation:
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Department of Radiological Technology, Graduate School of Health Sciences, Niigata University, Niigata, Niigata, Japan. kiyurino1189@happy.odn.ne.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Aged Aged, 80 and over Clinical Competence* Female Humans Male Middle Aged ROC Curve Retrospective Studies Statistics, Nonparametric Stroke / pathology, radiography* Time Factors Tomography, X-Ray Computed / methods* |
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