Preprocessing of ion microtomography data for improved reconstruction quality

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In Ion Microtomography (IMT), material densities are determined from the energy lost by ions as they pass through a specimen. For fine-scale measurements with micron-size beams, mechanical stability and precision of motion can impact the quality of the reconstruction. We describe several preprocessing procedures used to minimize imperfect specimen manipulation, including adjustment of the center of mass motion in sinograms and correction for vertical translations. In addition, the amount of noise in the reconstruction is reduced by utilizing median (as opposed to mean) ion energy loss values for density determinations. Furthermore, particular portions of the sampled image can be enhanced ... continued below

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Pages: (10 p)

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Weirup, D.L. (Lawrence Livermore National Lab., CA (USA)); Pontau, A.E.; Antolak, A.J.; Morse, D.H. (Sandia National Labs., Albuquerque, NM (USA)); Bench, G.; Cholewa, M. et al. November 29, 1990.

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Description

In Ion Microtomography (IMT), material densities are determined from the energy lost by ions as they pass through a specimen. For fine-scale measurements with micron-size beams, mechanical stability and precision of motion can impact the quality of the reconstruction. We describe several preprocessing procedures used to minimize imperfect specimen manipulation, including adjustment of the center of mass motion in sinograms and correction for vertical translations. In addition, the amount of noise in the reconstruction is reduced by utilizing median (as opposed to mean) ion energy loss values for density determinations. Furthermore, particular portions of the sampled image can be enhanced with minimal degradation of spatial resolution by a judicial choice of spatial filter in the reconstruction algorithm. The benefits and limitations of these preprocessing techniques are discussed.

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Pages: (10 p)

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OSTI; NTIS; GPO Dep.

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  • Fall meeting of the Materials Research Society, Boston, MA (USA), 24 Nov - 1 Dec 1990

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  • Other: DE91005420
  • Report No.: UCRL-JC-104563
  • Report No.: CONF-901105--44
  • Grant Number: W-7405-ENG-48
  • Grant Number: AC04-76DR00789
  • Office of Scientific & Technical Information Report Number: 6352464
  • Archival Resource Key: ark:/67531/metadc1203249

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  • November 29, 1990

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  • July 5, 2018, 11:11 p.m.

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Weirup, D.L. (Lawrence Livermore National Lab., CA (USA)); Pontau, A.E.; Antolak, A.J.; Morse, D.H. (Sandia National Labs., Albuquerque, NM (USA)); Bench, G.; Cholewa, M. et al. Preprocessing of ion microtomography data for improved reconstruction quality, article, November 29, 1990; United States. (digital.library.unt.edu/ark:/67531/metadc1203249/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.