Abstract
Purpose
To compare the repeatability, agreement, and efficiency of MRI- and CT-based semiautomated liver segmentation for the assessment of total and subsegmental liver volume.
Methods
This retrospective study was conducted in 31 subjects who underwent contemporaneous liver MRI and CT. Total and subsegmental liver volumes were segmented from contrast-enhanced 3D gradient-recalled echo MRI sequences and CT images. Semiautomated segmentation was based on variational interpolation and Laplacian mesh optimization. All segmentations were repeated after 2 weeks. Manual segmentation of CT images using an active contour tool was used as the reference standard. Repeatability and agreement of the methods were evaluated with intra-class correlation coefficients (ICC) and Bland–Altman analysis. Total interaction time was recorded.
Results
Intra-reader ICC were ≥0.987 for MRI and ≥0.995 for CT. Intra-reader repeatability was 30 ± 217 ml (bias ± 1.96 SD) (95% limits of agreement: −187 to 247 ml) for MRI and −10 ± 143 ml (−153 to 133 ml) for CT. Inter-method ICC between semiautomated and manual volumetry were ≥0.995 for MRI and ≥0.986 for CT. Inter-method segmental ICC varied between 0.584 and 0.865 for MRI and between 0.596 and 0.890 for CT. Inter-method agreement was –14 ± 136 ml (−150 to 122 ml) for MRI and 50 ± 226 ml (−176 to 276 ml) for CT. Inter-method segmental agreement ranged from 10 ± 47 ml (−37 to 57 ml) to 2 ± 214 ml (−212 to 216 ml) for MRI and 9 ± 45 ml (−36 to 54 ml) to −46 ± 183 ml (−229 to 137 ml) for CT. Interaction time (mean ± SD) was significantly shorter for MRI-based semiautomated segmentation (7.2 ± 0.1 min, p < 0.001) and for CT-based semiautomated segmentation (6.5 ± 0.2 min, p < 0.001) than for CT-based manual segmentation (14.5 ± 0.4 min).
Conclusion
MRI-based semiautomated segmentation provides similar repeatability and agreement to CT-based segmentation for total liver volume.
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Acknowledgments
This study was funded by 1) an operating Grant from the Canadian Institute of Health Research Institute of Nutrition, Metabolism and Diabetes (CIHR-INMD #273738), a Seed Grant from the Quebec Bio-Imaging Network (QBIN #8436-0501), a New Researcher Start-up Grant from the Centre de Recherche du Centre Hospitalier de l’Université de Montréal (CRCHUM), and a Career Award from the Fonds de recherche du Québec en Santé (FRQS-ARQ #26993) to An Tang; 2) a MITACS industrial research award (IT02111) to Gabriel Chartrand; and 3) a Research Chair of Canada in 3D Imaging and Biomedical engineering award to Jacques de Guise.
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Akshat Gotra, Gabriel Chartrand, Kim-Nhien Vu, Franck Vandenbroucke-Menu, Karine Massicotte-Tisluck, Jacques A. de Guise, and An Tang declares that they have no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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This study received approval prior to commencement from our institutional review board. Given the study design (retrospective, cross-sectional), informed consent requirements were waived.
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Gotra, A., Chartrand, G., Vu, KN. et al. Comparison of MRI- and CT-based semiautomated liver segmentation: a validation study. Abdom Radiol 42, 478–489 (2017). https://doi.org/10.1007/s00261-016-0912-7
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DOI: https://doi.org/10.1007/s00261-016-0912-7