Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Interpretation of dark-field contrast and particle-size selectivity in grating interferometers

Not Accessible

Your library or personal account may give you access

Abstract

In grating-based x-ray phase sensitive imaging, dark-field contrast refers to the extinction of the interference fringes due to small-angle scattering. For configurations where the sample is placed before the beamsplitter grating, the dark-field contrast has been quantified with theoretical wave propagation models. Yet when the grating is placed before the sample, the dark-field contrast has only been modeled in the geometric optics regime. Here we attempt to quantify the dark-field effect in the grating-before-sample geometry with first-principle wave calculations and understand the associated particle-size selectivity. We obtain an expression for the dark-field effect in terms of the sample material’s complex refractive index, which can be verified experimentally without fitting parameters. A dark-field computed tomography experiment shows that the particle-size selectivity can be used to differentiate materials of identical x-ray absorption.

© 2011 Optical Society of America

Full Article  |  PDF Article
More Like This
Statistical optics modeling of dark-field scattering in X-ray grating interferometers: Part 1. Theory

Jeffrey P. Wilde and Lambertus Hesselink
Opt. Express 29(25) 40891-40916 (2021)

Modeling of beam hardening effects in a dual-phase X-ray grating interferometer for quantitative dark-field imaging

Amogha Pandeshwar, Matias Kagias, Zhentian Wang, and Marco Stampanoni
Opt. Express 28(13) 19187-19204 (2020)

Statistical optics modeling of dark-field scattering in X-ray grating interferometers: Part 2. Simulation

Jeffrey P. Wilde and Lambertus Hesselink
Opt. Express 29(25) 40917-40933 (2021)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (71)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved