期刊
COMPUTATIONAL DIFFUSION MRI (CDMRI 2022)
卷 13722, 期 -, 页码 89-100出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/978-3-031-21206-2_8
关键词
Brain microstructure; White matter; ODF Fingerprinting; Diffusion MRI; Stochastic optimization
类别
资金
- National Institutes of Health (NIH) [R01-EB028774, R01-NS082436]
- Center for Advanced Imaging Innovation and Research (CAI2R), NIBIB Biomedical Technology Resource Center [NIH P41EB017183]
- NIH Blueprint for Neuroscience Research [1U54MH091657]
- McDonnell Center for Systems Neuroscience at Washington University
This paper proposes a stepwise stochastic adaptation mechanism to generate ODF dictionaries specifically tailored to diffusion-weighted images. Experimental results on diffusion phantom and in vivo human brain images show that our reconstructed diffusivities are more accurate and less noisy compared to prior uniform distribution of ODF dictionaries.
Fitting of the multicompartment biophysical model of white matter is an ill-posed optimization problem. One approach to make it computationally tractable is through Orientation Distribution Function (ODF) Fingerprinting. However, the accuracy of this method relies solely on ODF dictionary generation mechanisms which either sample the microstructure parameters on a multidimensional grid or draw them randomly with a uniform distribution. In this paper, we propose a stepwise stochastic adaptation mechanism to generate ODF dictionaries tailored specifically to the diffusion-weighted images in hand. The results we obtained on a diffusion phantom and in vivo human brain images show that our reconstructed diffusivities are less noisy and the separation of a free water fraction is more pronounced than for the prior (uniform) distribution of ODF dictionaries.
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