Abstract
Objective
To evaluate the reliability of the standard planimetric methodology of volumetric analysis and three different open-source semi-automated approaches of brain tumor segmentation.
Materials and methods
The volumes of subependymal giant cell astrocytomas (SEGA) examined by 30 MRI studies of 10 patients from a previous everolimus-related trial (EMINENTS study) were estimated using four methods: planimetric method (modified MacDonald ellipsoid method), ITK-Snap (pixel clustering, geodesic active contours, region competition methods), 3D Slicer (level-set thresholding), and NIRFast (k-means clustering, Markov random fields). The methods were compared, and a trial simulation was performed to determine how the choice of approach could influence the final decision about progression or response.
Results
Intraclass correlation coefficient was high (0.95; 95% CI 0.91–0.98). The planimetric method always overestimated the size of the tumor, while virtually no mean difference was found between ITK-Snap and 3D Slicer (P = 0.99). NIRFast underestimated the volume and presented a proportional bias. During the trial simulation, a moderate level of agreement between all the methods (kappa 0.57–0.71, P < 0.002) was noted.
Conclusion
Semi-automated segmentation can ease oncological follow-up but the moderate level of agreement between segmentation methods suggests that the reference standard volumetric method for SEGA tumors should be revised and chosen carefully, as the selection of volumetry tool may influence the conclusion about tumor progression or response.
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Author’s contribution
Stawiski—protocol/project development, data analysis; Trelinska—protocol/project development, data collection or management; Baranska—protocol/project development, data collection or management; Dachowska—data collection or management; Kotulska—data collection or management; Jozwiak—data collection or management, critical review; Fendler—protocol/project development, data analysis, critical review; Mlynarski—data collection or management, critical review.
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The study was previously approved by the Bioethics Committee of the Medical University of Lodz (# RNN/306/13/KE).
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Informed consent was obtained from all individual participants included in the study.
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The authors declare 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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The project is financed by the National Science Center grant number 2015/19/B/NZ5/02229.
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Stawiski, K., Trelińska, J., Baranska, D. et al. What are the true volumes of SEGA tumors? Reliability of planimetric and popular semi-automated image segmentation methods. Magn Reson Mater Phy 30, 397–405 (2017). https://doi.org/10.1007/s10334-017-0614-3
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DOI: https://doi.org/10.1007/s10334-017-0614-3