Journal ArticleDOI
Direct computed tomographic reconstruction for directional-derivative projections of computed tomography of diffraction enhanced imaging
Zhifeng Huang,Kejun Kang,Li Zheng,Peiping Zhu,Qingxi Yuan,Wanxia Huang,Junyue Wang,Di Zhang,Ai-Min Yu +8 more
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TLDR
In this article, a direct reconstruction algorithm for directional-derivative projections of computed tomography of diffraction enhanced imaging is proposed, which does not require any restoration processing compared with the current two-step methods.Abstract:
X-ray diffraction enhanced imaging based on synchrotron radiation has extremely high sensitivity of weakly absorbing low-Z samples in medical and biological fields. This letter is dedicated to a direct reconstruction algorithm for directional-derivative projections of computed tomography of diffraction enhanced imaging. It is a “one-step” algorithm and does not require any restoration processing compared with the current “two-step” methods. The actual values of the sample’s refractive index decrement can be estimated from its reconstruction images directly. The algorithm is proven by the actual experiment at the Beijing Synchrotron Radiation Facility and the reconstructed images are described finally.read more
Citations
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Journal ArticleDOI
A new iterative algorithm to reconstruct the refractive index.
Yijin Liu,Yijin Liu,Peiping Zhu,Bo Chen,Bo Chen,Junyue Wang,Q. Yuan,Weiling Huang,Hang Shu,Erzhong Li,Xin Liu,Kai Zhang,Hai Ming,Ziyu Wu +13 more
TL;DR: An improved iterative reconstruction algorithm based on the maximum likelihood expectation maximization technique is presented and discussed in order to reconstruct the distribution of the refractive index from data collected by an analyzer-based imaging setup.
Patent
Arrangement and method for projective and/or tomographic phase-contrast imaging using X-ray radiation
Tilman Donath,Martin Dr. Hoheisel,C. David,Eckhard Dr. Hempel,Franz Prof. Pfeiffer,Stefan Popescu +5 more
TL;DR: In this article, an arrangement and a method for projective and/or tomographic phase contrast imaging using X-ray radiation is described, where one or more phase grids are arranged in the beam path such that during a rotation of the at least one Xray source, an examination object is scanned with different spatial orientations of the grid lines relative to the examination object such that the complete refraction angle, and hence the complete phase shift gradient, can be determined for each Xray beam from the two scans with differently oriented phase grids in order to be able to show the phase
Journal ArticleDOI
X-ray refraction-contrast computed tomography images using dark-field imaging optics
TL;DR: In this article, the authors proposed an imaging system using dark-field imaging for CT measurement based on a tandem system of Bragg- and Laue-case crystals with two two-dimensional detectors, along with a data-processing method to extract information on refraction from the measured entangled intensities by use of rocking curve fitting with polynomial functions.
Journal ArticleDOI
High contrast microstructural visualization of natural acellular matrices by means of phase-based x-ray tomography
Charlotte K. Hagen,Panagiotis Maghsoudlou,Giorgia Totonelli,Paul C. Diemoz,Marco Endrizzi,Luigi Rigon,Luigi Rigon,Ralf Hendrik Menk,Fulvia Arfelli,Diego Dreossi,Emmanuel Brun,Paola Coan,Alberto Bravin,Paolo De Coppi,Alessandro Olivo +14 more
TL;DR: Image quality was sufficiently high to visualize scaffold microarchitecture and to detect major anatomical features, such as the esophageal mucosal-submucosal separation, pulmonary alveoli and intestinal villi, which are a long-sought step for regenerative medicine.
Journal ArticleDOI
Image reconstruction for fan-beam differential phase contrast computed tomography
Guang-Hong Chen,Zhihua Qi +1 more
TL;DR: A new image reconstruction formula for fan-beam DPC-CT that enables an exact reconstruction for a local ROI when the projection data are truncated at some view angles and enlarges the imaging field of view when the detector is asymmetrically placed is presented.
References
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Book
Principles of Computerized Tomographic Imaging
TL;DR: Properties of Computerized Tomographic Imaging provides a tutorial overview of topics in tomographic imaging covering mathematical principles and theory and how to apply the theory to problems in medical imaging and other fields.
Book
Computed Tomography: Principles, Design, Artifacts, and Recent Advances
TL;DR: Introduction Preliminaries Image Reconstruction Image Presentation Key Performance Parameters of a CT Scanner Major Components of CT scanner Image Artifacts: Appearances, Causes, and Corrections Computer Simulation and Analysis.
Computed Tomography: Principles, Design, Artifacts, and Recent Advances, Fourth Edition
TL;DR: Introduction Preliminaries Image Reconstruction Image Presentation Key Performance Parameters of a CT Scanner Major Components of CT scanner Image Artifacts: Appearances, Causes, and Corrections Computer Simulation and Analysis.
Journal ArticleDOI
Diffraction enhanced x-ray imaging
Dean Chapman,W. Thomlinson,R. E. Johnston,David B. Washburn,Etta D. Pisano,Nicholas F. Gmur,Zhong Zhong,Ralf Hendrik Menk,Fulvia Arfelli,Dale E. Sayers +9 more
TL;DR: Diffraction enhanced imaging is a new x-ray radiographic imaging modality using monochromatic x-rays from a synchrotron which produces images of thick absorbing objects that are almost completely free of scatter.
Journal ArticleDOI
Computed tomography of x-ray index of refraction using the diffraction enhanced imaging method.
F.A. Dilmanian,Zhong Zhong,B. Ren,X. Y. Wu,Leroy Dean Chapman,Itzhak Orion,William Thomlinson +6 more
TL;DR: Diffraction enhanced imaging is a new, synchrotron-based, x-ray radiography method that uses monochromatic, fan-shaped beams, with an analyser crystal positioned between the subject and the detector, and has the potential for use in clinical radiography and in industry.