3.8 Proceedings Paper

Stepwise Stochastic Dictionary Adaptation Improves Microstructure Reconstruction with Orientation Distribution Function Fingerprinting

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

资金

  1. National Institutes of Health (NIH) [R01-EB028774, R01-NS082436]
  2. Center for Advanced Imaging Innovation and Research (CAI2R), NIBIB Biomedical Technology Resource Center [NIH P41EB017183]
  3. NIH Blueprint for Neuroscience Research [1U54MH091657]
  4. McDonnell Center for Systems Neuroscience at Washington University

向作者/读者索取更多资源

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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