| Making renal stones change size-impact of CT image post processing and reader variability. | |
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MedLine Citation:
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PMID: 21698465 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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OBJECTIVES: The objectives of this study were to quantify the impact of image post-processing parameters on the apparent renal stone size, and to quantify the intra- and inter-reader variability in renal stone size estimation. METHODS: Fifty CT datasets including a renal or ureteral stone were included retrospectively during a prospective inclusion period. Each of the CT datasets was post-processed in different ways regarding slice thickness, slice increment and window setting. In the first part of the study a single reader repeated size estimations for the renal stones using different post-processing parameters. In the intra-reader variability experiment one reader reported size estimations for the same images with a one-week interval. The inter-reader variability data were obtained from 11 readers reporting size estimations for the same renal stones. RESULTS: The apparent stone size differed according to image post-processing parameters with the largest mean differences seen with regard to the window settings experiment (1.5 mm, p < 0.001) and slice thickness (0.8 mm, p < 0.001). Changes in parameters introduced a bias and a pseudo-random variability. The inter-reader variability was considerably larger than the intra-reader variability. CONCLUSION: Our results indicate a need for the standardisation of making measurements on CT images. |
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Authors:
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Mats Lidén; Torbjörn Andersson; Håkan Geijer |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-23 |
Journal Detail:
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Title: European radiology Volume: - ISSN: 1432-1084 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9114774 Medline TA: Eur Radiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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School of Health and Medical Sciences, Örebro University, 701 82, Örebro, Sweden, matsliden@yahoo.com. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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