Abstract
While 7T diffusion magnetic resonance imaging (dMRI) has high spatial resolution, its diffusion imaging quality is usually affected by signal loss due to B1 inhomogeneity, T2 decay, susceptibility, and chemical shift. In contrast, 3T dMRI has relative higher diffusion angular resolution, but lower spatial resolution. Combination of 3T and 7T dMRI, thus, may provide more detailed and accurate information about the voxel-wise fiber orientations to better understand the structural brain connectivity. However, this topic has not yet been thoroughly explored until now. In this study, we explored the feasibility of fusing 3T and 7T dMRI data to extract voxel-wise quantitative parameters at higher spatial resolution. After 3T and 7T dMRI data was preprocessed, respectively, 3T dMRI volumes were coregistered into 7T dMRI space. Then, 7T dMRI data was harmonized to the coregistered 3T dMRI B0 (b = 0) images. Last, harmonized 7T dMRI data was fused with 3T dMRI data according to four fusion rules proposed in this study. We employed high-quality 3T and 7T dMRI datasets (N = 24) from the Human Connectome Project to test our algorithms. The diffusion tensors (DTs) and orientation distribution functions (ODFs) estimated from the 3T-7T fused dMRI volumes were statistically analyzed. More voxels containing multiple fiber populations were found from the fused dMRI data than from 7T dMRI data set. Moreover, extra fiber directions were extracted in temporal brain regions from the fused dMRI data at Otsu’s thresholds of quantitative anisotropy, but could not be extracted from 7T dMRI dataset. This study provides novel algorithms to fuse intra-subject 3T and 7T dMRI data for extracting more detailed information of voxel-wise quantitative parameters, and a new perspective to build more accurate structural brain networks.
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Data Availability
The data and code that support the findings of this study are openly available at the following URL: https://github.com/freedom1979/7T-dMRI.
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Acknowledgements
The research was supported by Natural Science Foundation of Zhejiang Province (LY20E070005 and LY17E070007), China, National Natural Science Foundation of China (51207038), and the University of Houston. We acknowledge support from the Human Connectome Project (1U54MH091657-01), from the 16 NIH Institutes and Centers that support the NIH Blueprint for Neuroscience Research, Biotechnology Research Center (BTRC) grant (P41 EB015894) from NIBIB, NIH, and NINDS Institutional Center Core Grants to Support Neuroscience Research (P30NS076408). Also funding from the UK EPSRC (EP/L023067/1) and UK MRC (MR/L009013/1). Members of the WU-Minn HCP Consortium are listed at http://www.humanconnectome.org/about/hcp-investigators.html and http://www.humanconnectome.org/about/hcp-colleagues.html. Intra-subject dMRI datasets used in this study correspond to the following HCP subject: 126426, 130114, 130518, 134627, 135124, 146735, 165436, 167440, 177140, 180533, 239136, 360030, 385046, 401422, 463040, 550439, 644246, 757764, 765864, 878877, 905147, 943862, 971160, 995174.
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Z.W proposed the fusion algorithms, and drafted the article. X.W created the tables and Figures. J.S contributed to the writing of the article, including its critical review. M.H revised the manuscript and supervised this study. All authors approved the final form of the article.
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Wu, Z., Weng, X., Shen, J. et al. Voxel-Wise Fusion of 3T and 7T Diffusion MRI Data to Extract more Accurate Fiber Orientations. Brain Topogr (2024). https://doi.org/10.1007/s10548-024-01046-2
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DOI: https://doi.org/10.1007/s10548-024-01046-2