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X-ray computed tomography of wood-adhesive bondlines: attenuation and phase-contrast effects

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https://ir.library.oregonstate.edu/concern/articles/bz60cz45x

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Abstract
  • Microscale X-ray computed tomography (XCT) is discussed as a technique for identifying 3D adhesive distribution in wood-adhesive bondlines. Visualization and material segmentation of the adhesives from the surrounding cellular structures require sufficient gray-scale contrast in the reconstructed XCT data. Commercial wood-adhesive polymers have similar chemical characteristics and density to wood cell wall polymers and therefore do not provide good XCT attenuation contrast in their native form. Here, three different adhesive types, namely phenol formaldehyde, polymeric diphenylmethane diisocyanate, and a hybrid polyvinyl acetate, are tagged with iodine such that they yield sufficient X-ray attenuation contrast. However, phase-contrast effects at material edges complicate image quality and segmentation in XCT data reconstructed with conventional filtered backprojection absorption contrast algorithms. A quantitative phase retrieval algorithm, which isolates and removes the phase-contrast effect, was demonstrated. The article discusses and illustrates the balance between material X-ray attenuation and phase-contrast effects in all quantitative XCT analyses of wood-adhesive bondlines.
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  • Paris, J. L., Kamke, F. A., & Xiao, X. (2015). X-ray computed tomography of wood-adhesive bondlines: attenuation and phase-contrast effects. Wood Science and Technology, 49(6), 1185-1208. doi:10.1007/s00226-015-0750-8
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  • 49
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  • 6
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  • Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. Financial support was provided by the Wood-Based Composites Center, a National Science Foundation Industry/University Cooperative Research Center; project code A-04-KA.
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