Open AccessImproving radiation dose efficiency of X-ray differential phase contrast imaging using an energy-resolving grating interferometer and a novel rank constraint
Author(s) -
Yongshuai Ge,
Ran Zhang,
Ké Li,
Guang-Hong Chen
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.012955
Subject(s) - optics , contrast to noise ratio , imaging phantom , physics , noise (video) , phase contrast imaging , energy (signal processing) , detector , grating , signal to noise ratio (imaging) , image quality , computer science , computer vision , image (mathematics) , quantum mechanics , phase contrast microscopy
In this paper, a novel method was developed to improve the radiation dose efficiency, viz., contrast to noise ratio normalized by dose (CNRD), of the grating-based X-ray differential phase contrast (DPC) imaging system that is integrated with an energy-resolving photon counting detector. The method exploits the low-dimensionality of the spatial-spectral DPC image matrix acquired from different energy windows. A low rank approximation of the spatial-spectral image matrix was developed to reduce image noise while retaining the DPC signal accuracy for every energy window. Numerical simulations and experimental phantom studies have been performed to validate the proposed method by showing noise reduction and CNRD improvement for each energy window.