Phase retrieval based on deep learning in grating interferometer

Published

April 25, 2022

Author(s)

Ohsung Oh, Youngju Kim, Daeseung Kim, Daniel Hussey, Seung Wook Lee

Abstract

Grating interferometry is a promising technique to obtain differential phase contrast images with illumination source of low intrinsic transverse coherence. However, retrieving the phase contrast image from the differential phase contrast image is difficult due to the accumulated noise and artifacts from the differential phase contrast image reconstruction. In this paper, we implemented a deep learning-based phase retrieval method to suppress these artifacts. Conventional deep learning based denoising requires noisy-clean image pair, but it is not feasible to obtain sufficient number of clean images for grating interferometry. In this paper, we apply a recently developed neural network called Noise2Noise (N2N) that uses noise-noise image pairs for training. We obtained many differential phase contrast images through combination of phase stepping images, and these were used as noise input/target. The simulation and practical data showed that the phase contrast images were retrieved with low noises. These results can be used in grating interferometer applications which uses phase stepping method.

Citation

Nature - Scientific Reports

Pub Type

Journals

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Keywords

machine learning, neutron phase imaging, x-ray phase imaging, grating interferometry, noise2noise

Citation

Oh, O. , Kim, Y. , Kim, D. , Hussey, D. and Lee, S. (2022), Phase retrieval based on deep learning in grating interferometer, Nature - Scientific Reports, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933538 (Accessed December 11, 2024)