Abstract
Introduction
This study aims to develop an automatic segmentation framework on the basis of extreme value distribution (EVD) for the detection and volumetric quantification of white matter hyperintensities (WMHs) on fluid-attenuated inversion recovery (FLAIR) images.
Methods
Two EVD-based segmentation methods, namely the Gumbel and Fréchet segmentation, were developed to detect WMHs on FLAIR (slice thickness = 5 mm; TR/TE/TI = 11,000/120/2,800 ms; flip angle = 90°) images. Another automatic segmentation method using a trimmed likelihood estimator (TLE) was implemented for comparison with our proposed segmentation framework. The performances of the three automatic segmentation methods were evaluated by comparing with the manual segmentation method.
Results
The Dice similarity coefficients (DSCs) of the two EVD-based segmentation methods were larger than those of the TLE-based segmentation method (Gumbel, 0.823 ± 0.063; Fréchet, 0.843 ± 0.057; TLE, 0.817 ± 0.068), demonstrating that the EVD-based segmentation outperformed the TLE-based segmentation. The Fréchet segmentation obtained larger DSCs on patients with moderate to severe lesion loads and a comparable performance on patients with mild lesion loads, indicating that the Fréchet segmentation was superior to the Gumbel segmentation. The Gumbel segmentation underestimated the lesion volumes of all patients, whereas the Fréchet and TLE-based segmentation methods obtained overestimated lesion volumes (Manual, 13.71 ± 14.02 cc; Gumbel, 12.73 ± 13.21 cc; Fréchet, 13.88 ± 13.96 cc; TLE, 13.54 ± 12.27 cc). Moreover, the EVD-based segmentation was demonstrated to be comparable to other state-of-the-art methods on a publicly available dataset.
Conclusion
The proposed EVD-based segmentation framework is a promising, effective, and convenient tool for volumetric quantification and further study of WMHs in aging and dementia.
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Abbreviations
- WMHs:
-
White matter hyperintensities
- FLAIR:
-
Fluid-attenuated inversion recovery
- MRI:
-
Magnetic resonance imaging
- TLE:
-
Trimmed likelihood estimator
- EVD:
-
Extreme value distribution
- UND:
-
Unilateral normal distribution
- PDF:
-
Probability density function
- DSC:
-
Dice similarity coefficient
- FPR:
-
False-positive rate
- FNR:
-
False-negative rate
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Acknowledgments
This study has received funding by National Basic Research Program of China (973 Program, No. 2010CB732506), National Natural Science Foundation of China (No. 81301213), National Natural Science Foundation of China (No. 81000609), National Natural Science Foundation of China (No. 60972110), and Major Program of Social Science Foundation of China (No. 11&ZD174).
Ethical standards and patient consent
We declare that all human studies have been approved by the Institutional Review Board of Shanghai Jiao Tong University Sixth Affiliated People’s Hospital and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. We declare that all patients gave informed consent prior to inclusion in this study.
Conflict of interest
We declare that we have no conflict of interest.
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Wang, R., Li, C., Wang, J. et al. Automatic segmentation and volumetric quantification of white matter hyperintensities on fluid-attenuated inversion recovery images using the extreme value distribution. Neuroradiology 57, 307–320 (2015). https://doi.org/10.1007/s00234-014-1466-4
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DOI: https://doi.org/10.1007/s00234-014-1466-4