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Revisiting Neutron Propagation-Based Phase-Contrast Imaging and Tomography: Use of Phase Retrieval to Amplify the Effective Degree of Brilliance

David M. Paganin1,*, Morten Sales2, Peter M. Kadletz3, Winfried Kockelmann4, Mario A. Beltran1, Henning F. Poulsen2, and Søren Schmidt3

  • 1School of Physics and Astronomy, Monash University, Australia
  • 2Department of Physics, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark
  • 3European Spallation Source ERIC, P.O. Box 176, Lund SE-221 00, Sweden
  • 4STFC-Rutherford Appleton Laboratory, ISIS Facility, Harwell OX11 0QX, United Kingdom

  • *David.Paganin@monash.edu
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Phys. Rev. Applied 19, 034005 – Published 2 March, 2023

DOI: https://doi.org/10.1103/PhysRevApplied.19.034005

Abstract

Propagation-based neutron phase-contrast tomography is demonstrated using the ISIS pulsed spallation source. The proof-of-concept tomogram with a Paganin-type phase-retrieval filter applied exhibits an effective net boost of 23±1 in the signal-to-noise ratio as compared with an attenuation-based tomogram, implying a boost in the effective degree of neutron brilliance of over 2 orders of magnitude. This comparison is for phase retrieval versus conventional absorption with no additional collimation in place. We provide expressions for the optimal phase-contrast geometry as well as conditions for the validity of the method. The underpinning theory is derived under the assumption of the sample being composed of a single material. The effective boost in brilliance may be employed to give reduced acquisition time, or may instead be used to keep exposure times fixed while improving the measured contrast.

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Phys. Rev. Applied 19, 034005– Published 2 March, 2023
  • Received 12 February 2020
  • Revised 11 October 2022
  • Accepted 1 February 2023
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