Abstract
Most processing pipelines for diffusion MRI (dMRI) require an intracranial mask image to exclude voxels outside the skull, and some dMRI analyses also need a segmentation between the voxels that are primarily tissue or cerebrospinal fluid (CSF). dMRI is challenging for most segmentation methods because it usually has relatively severe image artifacts and coarse resolution. However, it does provide information about the physical properties of the material(s) in each voxel, which can be directly applied to segmentation. We describe the training of a random forest classifier to segment dMRI into intracranial, brain, and CSF masks, and compare its results to three other segmentation methods commonly used in dMRI processing. The effect of correcting smooth spatial intensity variations on dMRI segmentation is also tested.
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Acknowledgements
The authors thank K. Kantarci, M. Senjem, and J. Gunter for helpful conversations and suggestions while preparing this paper.
This article used images from the Longitudinal Evaluation of Familial Frontotemporal Dementia Subjects study, U01 AG045390, Advancing Research and Treatment for Frontotemporal Lobar Degeneration, AB-BFP-2015/AB-BFP-2016, the ARIC-PET Amyloid Study, R01 AG040282, the role of intracranial atherosclerosis in the development of Alzheimer’s Disease study, R01 AG054491, the ARIC study of midlife sleep and late-life brain amyloid, RF1 AG050745, Stroke and Cognitive Impairment in Aging CKD Patients, R01 AG0375, the Alzheimer’s Disease Neuroimaging Initiative (ADNI), U01 AG024904 and U01 AG024904, and the Mayo Clinic Study of Aging, U01 AG006786. Investigators within the ADNI consortium contributed to the design and implementation of ADNI and/or provided data but not all participated in the analysis or writing of this report. A complete listing of ADNI investigators can be found at: http://adni.loni.usc.edu/wp-content/uploads/how_to_apply/ADNI_Acknowledgement_List.pdf.
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Reid, R.I., Nedelska, Z., Schwarz, C.G., Ward, C., Jack, C.R., The Alzheimer’s Disease Neuroimaging Initiative. (2018). Diffusion Specific Segmentation: Skull Stripping with Diffusion MRI Data Alone. In: Kaden, E., Grussu, F., Ning, L., Tax, C., Veraart, J. (eds) Computational Diffusion MRI. Mathematics and Visualization. Springer, Cham. https://doi.org/10.1007/978-3-319-73839-0_5
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DOI: https://doi.org/10.1007/978-3-319-73839-0_5
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