Abstract
Purpose
Gadolinium-based contrast agent (GBCA) effect on automated segmentation algorithms of subcortical gray matter (GM) is not fully known. The aim of this study is to determine gadolinium effect on the segmentation of the thalamus and whole brain tissue using different automated segmentation techniques.
Methods
Eighty-four multiple sclerosis (MS) patients underwent an MRI acquisition of two 3DT1-weighted sequences with and without gadolinium injection among which 10 were excluded after image quality check. Manual thalamic segmentation considered as gold standard was performed on unenhanced T1 images. volBrain and FSL-Anat were used to automatically segment the thalamus on both enhanced and unenhanced T1 and the degree of similitude (DICE) values were compared between manual and automatic segmentations. Whole brain tissue segmentation (GM, white matter (WM), and lateral ventricles (LV)) was also performed using SIENAX. A paired samples t test was applied to test the significance of DICE value differences between the thalamic manual and automatic segmentations of both enhanced and unenhanced T1 images.
Results
Significant differences (FSL-Anat 1.474% p < 0.001 and volBrain 1.990% p < 0.001) in DICE between thalamic manual and automatic segmentations on both enhanced and unenhanced images were observed. Automatic tissue segmentation showed a mean DICE of 81.5%, with LV having the lowest DICE value (74.2%). When compared to tissue segmentations, automatic thalamic segmentations by FSL-Anat or volBrain demonstrated a higher degree of similitude (FSL-Anat = 91.7% and volBrain = 90.7%).
Conclusion
Gadolinium has a significant effect on subcortical GM segmentation. Although significant, the observed subtle changes could be considered acceptable when used for region-based analysis in perfusion or diffusion imaging.
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Abbreviations
- BBB:
-
Brain blood barrier
- BPF:
-
Brain parenchymal fraction
- CSF:
-
Cerebro-spinal fluid
- DICE:
-
Degree of similitude
- DTI:
-
Diffusion tensor imaging
- DWI:
-
Diffusion weighted imaging
- FLAIR:
-
Fluid-attenuated inversion recovery
- GBCA:
-
Gadolinium-based contrast agent
- GM:
-
Gray matter
- LV:
-
Lateral ventricles
- MRI:
-
Magnetic resonance imaging
- MS:
-
Multiple sclerosis
- WM:
-
White matter
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Acknowledgements
The authors would like to thank the Nehme and Therese Tohme Multiple Sclerosis Center at the American University of Beirut Medical Center for funding this study.
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This study was funded by the Nehme and Therese Thome Multiple Sclerosis Center, American University of Beirut Medical Center.
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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. For this type of study formal consent is not required.
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Hannoun, S., Baalbaki, M., Haddad, R. et al. Gadolinium effect on thalamus and whole brain tissue segmentation. Neuroradiology 60, 1167–1173 (2018). https://doi.org/10.1007/s00234-018-2082-5
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DOI: https://doi.org/10.1007/s00234-018-2082-5