From Event: SPIE Optical Engineering + Applications, 2016
Recent advances in X-ray imaging technologies have paved the way for use of energy-discriminating photon-counting
detector arrays. These detectors show promise in clinical and preclinical applications. Multi-energy or spectral CT images
can be visualized in multi-colors. Despite the advantages offered by the spectral dimension of acquired data, higher image
resolution is still desirable, especially in challenging tasks such as on-site studies of resected pathological tissues. Here we
propose to enhance image resolution of a spectral X-ray imaging system by partially blocking each detector element with
an absorption grating (for reduced aperture), commonly used for Talbot-Lau interferometry. After acquiring X-ray data at
an initial grating-detector configuration, the grating is shifted to expose previously blocked portions so that each
measurement contains new information. All the acquired data are then combined into an augmented system matrix and
subsequently reconstructed using an iterative algorithm. Our proof of concept simulations are performed with MCNP6.1
code and the experiment was performed using a Hamamatsu microfocus X-ray source, an absorption grating, and an Xray
camera. Our results demonstrate that the gratings commonly used for x-ray phase-contrast imaging have a utility for
super-resolution imaging performance.
Matthew Getzin, Tianyu Liu, Qingsong Yang, Mianyi Chen, Wenxiang Cong, George Xu, and Ge Wang, "Enhancing spatial resolution for spectral uCT with aperture encoding," Proc. SPIE 9967, Developments in X-Ray Tomography X, 99670W (Presented at SPIE Optical Engineering + Applications: August 30, 2016; Published: 20 September 2016); https://doi.org/10.1117/12.2237840.
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