Sensitivity-based optimization for the design of a grating interferometer for clinical X-ray phase contrast mammography

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Abstract

An X-ray grating interferometer (GI) suitable for clinical mammography must comply with quite strict dose, scanning time and geometry limitations, while being able to detect tumors, microcalcifications and other abnormalities. Such a design task is not straightforward, since obtaining optimal phase-contrast and dark-field signals with clinically compatible doses and geometrical constraints is remarkably challenging. In this work, we present a wave propagation based optimization that uses the phase and dark-field sensitivities as figures of merit. This method was used to calculate the optimal interferometer designs for a commercial mammography setup. Its accuracy was validated by measuring the visibility of polycarbonate samples of different thicknesses on a Talbot-Lau interferometer installed on this device and considering some of the most common grating imperfections to be able to reproduce the experimental values. The optimization method outcomes indicate that small grating pitches are required to boost sensitivity in such a constrained setup and that there is a different optimal scenario for each signal type.

Detaljer

Författare
  • Carolina Arboleda
  • Zhentian Wang
  • Thomas Koehler
  • Gerhard Martens
  • Udo Van Stevendaal
  • Matthias Bartels
  • Pablo Villanueva-Perez
  • Ewald Roessl
  • Marco Stampanoni
Externa organisationer
  • Paul Scherrer Institute
  • ETH Zürich
Originalspråkengelska
Sidor (från-till)6349-6364
Antal sidor16
TidskriftOptics Express
Volym25
Utgåva nummer6
StatusPublished - 2017 mar 20
PublikationskategoriForskning
Peer review utfördJa
Externt publiceradJa