Document Type
Article
Publication Date
12-1-2024
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.
Publication Source (Journal or Book title)
Scientific Reports
Recommended Citation
Meyer, H., Dey, J., Carr, S., Ham, K., Butler, L., Dooley, K., Hidrovo, I., Bleuel, M., Varga, T., Schulz, J., Beckenbach, T., & Kaiser, K. (2024). Theoretical and experimental analysis of the modulated phase grating X-ray interferometer. Scientific Reports, 14 (1) https://doi.org/10.1038/s41598-024-78133-8