High fidelity fiber orientation density functions from fiber ball imaging
| Autor: | Hunter G. Moss, Jens H. Jensen |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Fiber (mathematics) Acoustics Scalar (physics) Probability density function computer.software_genre White Matter Noise (electronics) Article Diffusion Magnetic Resonance Imaging Nerve Fibers Voxel Anisotropy Humans Molecular Medicine Radiology Nuclear Medicine and imaging Angular resolution computer Spectroscopy Diffusion MRI |
| Zdroj: | NMR Biomed |
| ISSN: | 1099-1492 0952-3480 |
| Popis: | The fiber orientation density function (fODF) in white matter is a primary physical quantity that can be estimated with diffusion MRI. It has often been employed for fiber tracking and microstructural modeling. Requirements for the construction of high fidelity fODFs, in the sense of having good angular resolution, adequate data to avoid sampling errors, and minimal noise artifacts, are described for fODFs calculated with fiber ball imaging. A criterion is formulated for the number of diffusion encoding directions needed to achieve a given angular resolution. The advantages of using large b-values (≥6000 s/mm(2)) are also discussed. For the direct comparison of different fODFs, a method is developed for defining a local frame of reference tied to each voxel’s individual axonal structure. The Matusita anisotropy axonal is proposed as a scalar fODF measure for quantifying angular variability. Experimental results, obtained at 3 T from human volunteers, are used as illustrations. |
| Databáze: | OpenAIRE |
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