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Diffusion-weighted spatial information from1H relaxation in restricted geometries

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Il Nuovo Cimento D

Summary

NMR relaxation of water1H confined in restricted geometries, whatever is the nature of the system (porous media saturated by water as well as biological tissues), exhibits common characteristics. Artificial microporous media saturated by water have been chosen as model systems to study the longitudinal and transverse relaxation of1H magnetization of water molecules diffusing in restricted geometries. These systems are very stable, easy to prepare, with well-characterized pore size distribution and connections, and with highly homogeneous surface properties. The response was compared with that from more complex natural porous media. Scanning Electron Microscopy techniques demonstrated spatial characteristics and surface properties of the samples. The information content of longitudinal relaxation curves associated with spatial structure and due to restricted diffusion is shown in these samples. The effect on transverse relaxation of self-diffusion in the presence of spatially varying magnetic fields due to susceptibility differences is shown. A simple linear relationship has been found in all samples between the transverse relaxation rate and the interpulse delay in CPMG experiments, in spite of the variety of pore shapes and sizes. In general, one can say that relaxation curves beardiffusion-weighted information on the pore space framework. The role of the investigated relaxation mechanisms is important also in the response of biological tissues, including in the presence of MR Imaging contrast agents inducing microscopic magnetic-field gradients.

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Authors and Affiliations

  1. Istituto di Scienze Minerarie dell’Università, Viale Risorgimento 2, 40136, Bologna, Italia

    G. C. Borgia & E. Mesini

  2. 515 W. 11th St., 91711-3721, Claremont, CA, USA

    R. J. S. Brown

  3. Dipartimento di Fisica dell’Università, Via Irnerio 46, 40126, Bologna, Italia

    P. Fantazzini

  4. Dipartimento di Scienze Mineralogiche dell’Università Piazza di Porta S. Donato 1, 40126, Bologna, Italia

    G. Valdre

  5. Centro di Microscopia Elettronica del Dipartimento di Fisica dell’Università, Via Irnerio 46, 40126, Bologna, Italia

    G. Valdre

Authors
  1. G. C. Borgia
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  2. R. J. S. Brown
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  3. P. Fantazzini
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  4. E. Mesini
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  5. G. Valdre
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Work partially supported by CNR and MURST Grants.

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Borgia, G.C., Brown, R.J.S., Fantazzini, P. et al. Diffusion-weighted spatial information from1H relaxation in restricted geometries. Il Nuovo Cimento D 14, 745–759 (1992). https://doi.org/10.1007/BF02451721

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  • DOI: https://doi.org/10.1007/BF02451721

PACS 76.60

PACS 76.60.Jx

PACS 87.71.Kb

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