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High-Precision MRI Reconstruction Algorithm for 3D Sphere Packings

Balzan, R. ; Sellerio, A. ; Mari, D. ; Comment, A.

In: Applied Magnetic Resonance, 2015, vol. 46, no. 6, p. 633-642

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    Titre
    • High-Precision MRI Reconstruction Algorithm for 3D Sphere Packings
    Auteur
    • Balzan, R.. Institute of Physics of Biological Systems, EPFL, 1015, Lausanne, Switzerland
    • Sellerio, A.. Institute of Condensed Matter Physics, EPFL, 1015, Lausanne, Switzerland
    • Mari, D.. Institute of Condensed Matter Physics, EPFL, 1015, Lausanne, Switzerland
    • Comment, A.. Institute of Physics of Biological Systems, EPFL, 1015, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Applied Magnetic Resonance, 2015, vol. 46, no. 6, p. 633-642. Springer Vienna
    Autre version électronique
    Classification
    • Physique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:333101
    Summary
    Packings of granular materials are complex systems consisting of large sets of particles interacting via contact forces. Their internal structure is interesting for several theoretical and practical reasons, especially when the model system consists in a large amount (up to 105) of identical spheres. We herein present a method to process three-dimensional water density maps recorded in wet granular packings of mm-size spheres by magnetic resonance imaging (MRI). Packings of spheres with highly mono-dispersed diameter are considered and the implementation of an ad hoc reconstruction algorithm tailored for this feature allows for the determination of the position of each single sphere with an unprecedented precision (with respect to the scale of the system) while ensuring that all spheres are identified and no non-existing sphere is introduced in the reconstructed packing. The reconstruction of a 0.5 L sample containing about 2×104 spheres is presented to demonstrate the robustness of the method.