Theoretical and experimental analysis of the modulated phase grating X-ray interferometer

Authors

• Hunter Meyer, Louisiana State University, Baton Rouge, LA
• Joyoni Dey, Louisiana State University, Baton Rouge, LA
• Sydney Carr, Louisiana State University, Baton Rouge, LA
• Kyungmin Ham, Louisiana State University, Baton Rouge, LA
• Leslie G. Butler, Louisiana State University, Baton Rouge, LA
• Kerry M. Dooley, Louisiana State University, Baton Rouge, LA
• Ivan Hidrovo, Louisiana State University, Baton Rouge, LA
• Markus Bleuel, Adelphi Technology, Inc., Redwood City, CA
• Tamas Varga, Pacific Northwest National Laboratory, Richland, WA
• Joachim Schulz, Microworks GmbH, Karlsruhe, Germany
• Thomas Beckenbach, Microworks GmbH, Karlsruhe, Germany
• Konradin Kaiser, Microworks GmbH, Karlsruhe, Germany

Document Type

Article

Publication Date

11-5-2024

Publication Title

Scientific Reports

Abstract

X-ray grating interferometry allows for the simultaneous acquisition of attenuation, differential-phase contrast, and dark-field images, resulting from X-ray attenuation, refraction, and small-angle scattering, respectively. The modulated phase grating (MPG) interferometer is a recently developed grating interferometry system capable of generating a directly resolvable interference pattern using a relatively large period grating envelope function that is sampled at a pitch that is small enough that X-ray spatial coherence can be achieved by using a microfocus X-ray source or G0 grating. We present the theory of the MPG interferometry system for a 2-dimensional staggered grating, derived using Fourier optics, and we compare the theoretical predictions with experiments we have performed with a microfocus X-ray system at Pennington Biomedical Research Center, LSU. The theoretical and experimental fringe visibility is evaluated as a function of grating-to-detector distance. Additionally, quantitative experiments are performed with porous carbon and alumina compounds, and the mean normalized dark-field signal is compared with independent porosimetry measurements. Qualitative analysis of attenuation and dark-field images of a dried anchovy are shown.

First Page

1*

Last Page

15

DOI

10.1038/s41598-024-78133-8

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Recommended Citation

Meyer, Hunter; Dey, Joyoni; Carr, Sydney; Ham, Kyungmin; Butler, Leslie G.; Dooley, Kerry M.; Hidrovo, Ivan; Bleuel, Markus; Varga, Tamas; Schulz, Joachim; Beckenbach, Thomas; and Kaiser, Konradin, "Theoretical and experimental analysis of the modulated phase grating X-ray interferometer" (2024). LSU-LCMC Cancer Center Faculty Publications. 219.
https://digitalscholar.lsuhsc.edu/llcc_facpubs/219
10.1038/s41598-024-78133-8