Abstract
Being the only imaging modality capable of delineating the anatomical structure of the white matter, diffusion magnetic resonance imaging (dMRI) is currently believed to provide a long-awaited means for early diagnosis of various neurological conditions as well as for interrogating the brain connectivity. Despite substantial advances in practical use of dMRI, a solid mathematical platform for modelling and treating dMRI signals still seems to be missing. Accordingly, in this paper, we show how a Hilbert space of \(\mathbb{L}^2\)-valued mappings \(u: X \to \mathbb{L}^2({\mathbb{S}^2})\), with X being a subset of ℝ3 and \(\mathbb{L}^2({\mathbb{S}^2})\) being the set of squared-integrable functions supported on the unit sphere \({\mathbb{S}^2}\), provides a natural setting for a specific example of dMRI, known as high-angular resolution diffusion imaging. The proposed formalism is also shown to provide a basis for image processing schemes such as total variation minimization. Finally, we discuss a way to amalgamate the proposed models with the tools of compressed sensing to achieve a close-to-perfect recovery of diffusion signals from a minimal number of their discrete measurements. The main outcomes of this paper are supported by a series of experimental results.
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Michailovich, O., La Torre, D., Vrscay, E.R. (2012). Function-Valued Mappings, Total Variation and Compressed Sensing for diffusion MRI. In: Campilho, A., Kamel, M. (eds) Image Analysis and Recognition. ICIAR 2012. Lecture Notes in Computer Science, vol 7325. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31298-4_34
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DOI: https://doi.org/10.1007/978-3-642-31298-4_34
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