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Variability assessment of manual segmentations of ischemic lesion volume on 24-h non-contrast CT
P. Cimflova, JM. Ospel, M. Marko, BK. Menon, W. Qiu
Language English Country Germany
Document type Journal Article
NLK
ProQuest Central
from 2002-01-01 to 1 year ago
CINAHL Plus with Full Text (EBSCOhost)
from 2008-01-01 to 1 year ago
Medline Complete (EBSCOhost)
from 2003-01-01 to 1 year ago
Nursing & Allied Health Database (ProQuest)
from 2002-01-01 to 1 year ago
Health & Medicine (ProQuest)
from 2002-01-01 to 1 year ago
- MeSH
- Algorithms MeSH
- Stroke * diagnostic imaging MeSH
- Ischemic Stroke * MeSH
- Humans MeSH
- Tomography, X-Ray Computed methods MeSH
- Reproducibility of Results MeSH
- Aged MeSH
- Check Tag
- Humans MeSH
- Male MeSH
- Aged MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
PURPOSE: Infarct lesion volume (ILV) may serve as an imaging biomarker for clinical outcomes in the early post-treatment stage in patients with acute ischemic stroke. The aim of this study was to evaluate the inter- and intra-rater reliability of manual segmentation of ILV on follow-up non-contrast CT (NCCT) scans. METHODS: Fifty patients from the Prove-IT study were randomly selected for this analysis. Three raters manually segmented ILV on 24-h NCCT scans, slice by slice, three times. The reference standard for ILV was generated by the Simultaneous Truth And Performance Level estimation (STAPLE) algorithm. Intra- and inter-rater reliability was evaluated, using metrics of intraclass correlation coefficient (ICC) regarding lesion volume and the Dice similarity coefficient (DSC). RESULTS: Median age of the 50 subjects included was 74.5 years (interquartile range [IQR] 67-80), 54% were women, median baseline National Institutes of Health Stroke Scale was 18 (IQR 11-22), median baseline ASPECTS was 9 (IQR 6-10). The mean reference standard ILV was 92.5 ml (standard deviation (SD) ± 100.9 ml). The manually segmented ILV ranged from 88.2 ± 91.5 to 135.5 ± 119.9 ml (means referring to the variation between readers, SD within readers). Inter-rater ICC was 0.83 (95%CI: 0.76-0.88); intra-rater ICC ranged from 0.85 (95%CI: 0.72-0.92) to 0.95 (95%CI: 0.91-0.97). The mean DSC among the three readers ranged from 65.5 ± 22.9 to 76.4 ± 17.1% and the mean overall DSC was 72.8 ± 23.0%. CONCLUSION: Manual ILV measurements on follow-up CT scans are reliable to measure the radiological outcome despite some variability.
Department of Neurology Medical University of Vienna Vienna Austria
Department of Radiology Cumming School of Medicine University of Calgary Calgary Canada
Department of Radiology University Hospital of Basel Basel Switzerland
Faculty of Medicine in Hradec Kralove Charles University Hradec Kralove Czech Republic
References provided by Crossref.org
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- $a Cimflova, Petra $u Departments of Clinical Neurosciences, Calgary Stroke Program, Cumming School of Medicine, University of Calgary, Calgary, Canada $u Department of Medical Imaging, St. Anne's University Hospital and Faculty of Medicine, Masaryk University, Brno, Czech Republic $u Faculty of Medicine in Hradec Kralove, Charles University, Hradec Kralove, Czech Republic $u Department of Radiology, Cumming School of Medicine, University of Calgary, Calgary, Canada $1 https://orcid.org/000000018058383X
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- $a PURPOSE: Infarct lesion volume (ILV) may serve as an imaging biomarker for clinical outcomes in the early post-treatment stage in patients with acute ischemic stroke. The aim of this study was to evaluate the inter- and intra-rater reliability of manual segmentation of ILV on follow-up non-contrast CT (NCCT) scans. METHODS: Fifty patients from the Prove-IT study were randomly selected for this analysis. Three raters manually segmented ILV on 24-h NCCT scans, slice by slice, three times. The reference standard for ILV was generated by the Simultaneous Truth And Performance Level estimation (STAPLE) algorithm. Intra- and inter-rater reliability was evaluated, using metrics of intraclass correlation coefficient (ICC) regarding lesion volume and the Dice similarity coefficient (DSC). RESULTS: Median age of the 50 subjects included was 74.5 years (interquartile range [IQR] 67-80), 54% were women, median baseline National Institutes of Health Stroke Scale was 18 (IQR 11-22), median baseline ASPECTS was 9 (IQR 6-10). The mean reference standard ILV was 92.5 ml (standard deviation (SD) ± 100.9 ml). The manually segmented ILV ranged from 88.2 ± 91.5 to 135.5 ± 119.9 ml (means referring to the variation between readers, SD within readers). Inter-rater ICC was 0.83 (95%CI: 0.76-0.88); intra-rater ICC ranged from 0.85 (95%CI: 0.72-0.92) to 0.95 (95%CI: 0.91-0.97). The mean DSC among the three readers ranged from 65.5 ± 22.9 to 76.4 ± 17.1% and the mean overall DSC was 72.8 ± 23.0%. CONCLUSION: Manual ILV measurements on follow-up CT scans are reliable to measure the radiological outcome despite some variability.
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