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Making renal stones...
Making renal stones change size : impact of CT image post processing and reader variability
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- Lidén, Mats (author)
- Örebro universitet,Hälsoakademin
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- Andersson, Torbjörn (author)
- Örebro universitet,Institutionen för läkarutbildning
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- Geijer, Håkan (author)
- Örebro universitet,Hälsoakademin
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(creator_code:org_t)
- 2011-06-23
- 2011
- English.
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In: European Radiology. - : Springer Science and Business Media LLC. - 0938-7994 .- 1432-1084. ; 21:10, s. 2218-2225
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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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.
Keyword
- Medicine
- Medicin
Publication and Content Type
- ref (subject category)
- art (subject category)
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