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Three‐Dimensional Electron Paramagnetic Resonance Imaging Technique for Mapping Porosity in Ceramics
Author(s) -
Kordas George,
Kang YounHo
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb06912.x
Subject(s) - imaging phantom , materials science , electron paramagnetic resonance , ceramic , porosity , image resolution , resolution (logic) , plane (geometry) , magnetic resonance imaging , projection (relational algebra) , nuclear magnetic resonance , optics , physics , computer science , geometry , composite material , artificial intelligence , radiology , medicine , mathematics , algorithm
A three‐dimensional (3D) electron paramagnetic resonance imaging (EPRI) method was developed to probe the structure and size of pores in ceramic materials. The imaging device that was added to the EPR instrument consisted of a computer‐controlled current source and magnetic field gradient. This add‐on facility was tested using a well‐defined diphenylpicrylhydrazyl phantom sample. Pumice was then used to demonstrate the potential of the technique. This stone was immersed in a 0.5 m M 15 N‐substituted perdeutereted tempone water solution to fill the pores with spin labels. Images were reconstructed using a filtered backprojection technique. A two‐dimensional (2D) imaging plane was constructed by collecting 33 projection planes over 180°. A 3D image was derived from 22 planes each constructed by 22 projections. At present, the facility allows a resolution of 69 and 46μm for 2D and 3D imaging, respectively. Advancements of the imaging apparatus, software, and line width of the spin labels will be needed to enhance the resolution of this technique.