Advanced Tomographic Imaging Methods for the Analysis of Materials

Abstract

Nuclear magnetic resonance (NMR) imaging is being vigorously pursued as a nondestructive characterization tool for materials. The promise of measuring spin concentration, molecular mobility (via the spin-lattice (T1) and spin spin (T2) relaxation times), and chemical structure (by largely unrealized localized spectroscopy techniques) at various locations within a sample has resulted in initial applications in a wide variety of nonmedical areas. Sizes have ranged from tree trunks of 25-cm diameter to 'microscopic' studies on millimeter-sized objects at 50-100 um resolution. Because standard NMR imaging techniques are limited to observing molecularly mobile components, applications to date have concentrated on bulk elastomers, solvent diffusion, and liquids in porous inorganic materials such as ceramics and oil cores. Techniques are being developed for imaging of highly rigid materials, which is the subject of other papers in this proceedings. For standard NMR imaging techniques, the primary requirement for increased resolution is powerful gradients.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1991
Accession Number
ADA241912

Entities

People

  • Jerome L. Ackerman
  • William A. Ellingson

Organizations

  • Materials Research Society

Tags

Communities of Interest

  • Advanced Electronics
  • Biomedical
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Chemical Synthesis
  • Chemistry
  • Health Services
  • Material Degradation Processes
  • Materials
  • Materials Engineering
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Three Dimensional
  • X-Ray Computed Tomography

Readers

  • Materials Science and Engineering.
  • Medical Imaging.
  • Reinforced Composite Materials