scholarly journals Phase Contrast Cone Beam Tomography with an X-Ray Grating Interferometer

2010 ◽  
Author(s):  
I. Jerjen ◽  
V. Revol ◽  
C. Kottler ◽  
Th. Luethi ◽  
U. Sennhauser ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Cone Beam ◽  
X Ray ◽  
Grating Interferometer ◽  
Cone Beam Tomography

Image Quality Analysis of X-ray Grating Interferometer Using Integrating-bucket Method

2020 ◽  
Vol 64 (2) ◽  
pp. 20503-1-20503-5
Author(s):  
Faiz Wali ◽  
Shenghao Wang ◽  
Ji Li ◽  
Jianheng Huang ◽  
Yaohu Lei ◽  
...  
Keyword(s):  
Image Quality ◽  
Phase Contrast ◽  
Quality Analysis ◽  
Phase Contrast Imaging ◽  
Phase Image ◽  
Contrast Imaging ◽  
High Quality ◽  
Image Quality Analysis ◽  
X Ray ◽  
Grating Interferometer

Abstract Grating-based x-ray phase-contrast imaging has the potential to enhance image quality and provide inner structure details non-destructively. In this work, using grating-based x-ray phase-contrast imaging system and employing integrating-bucket method, the quantitative expressions of signal-to-noise ratios due to photon statistics and mechanical error are analyzed in detail. Photon statistical noise and mechanical error are the main sources affecting the image noise in x-ray grating interferometry. Integrating-bucket method is a new phase extraction method translated to x-ray grating interferometry; hence, its image quality analysis would be of great importance to get high-quality phase image. The authors’ conclusions provide an alternate method to get high-quality refraction signal using grating interferometer, and hence increases applicability of grating interferometry in preclinical and clinical usage.

Simulation of x-ray projections for 3D cone-beam tomography

2002 ◽  
Author(s):  
Zhongyuan Qin ◽  
Xuan-qin Mu ◽  
Ping Wang ◽  
Yuanlong Cai
Keyword(s):  
Cone Beam ◽  
X Ray ◽  
Cone Beam Tomography

scholarly journals Cone-Beam 3-D Reconstruction with Double Circular Trajectory

1990 ◽  
Vol 217 ◽  
Author(s):  
Ph. Rizo ◽  
P. Grangeat ◽  
P. Sire ◽  
P. Lemasson ◽  
S. Delageniere
Keyword(s):  
Mean Square Error ◽  
Incomplete Data ◽  
Cone Beam ◽  
Mean Square ◽  
Modulation Transfer ◽  
Circular Trajectory ◽  
X Ray ◽  
Planar Source ◽  
Infinite Line ◽  
Cone Beam Tomography

ABSTRACTIn X-ray cone-beam tomography, the only planar source trajectory that does not produce incomplete data is the infinite line. Such a source trajectory is not experimentally possible. To ensure complete data acquisition with cone-beam radiographs, a set of nonplanar trajectories has been studied. Among the trajectories proposed in the literature, a simple one is a set of two circular trajectories with intersection of the two trajectory axes. The angle between the two axes is related to the maximum aperture of the cone beam. We propose here an exact method for performing this reconstruction using the 3-D Radon transform of the object. The modulation transfer function of this algorithm remains identical to that for the central slice of reconstruction in a single circular trajectory. The relative mean square error for density stays within 2% for an aperture of ±30°. With a single circular trajectory, the relative mean square error may reach 20% at the same aperture. With a double circular trajectory, horizontal artifacts are nearly suppressed.

scholarly journals X-ray phase-contrast computed tomography visualizes the microstructure and degradation profile of implanted biodegradable scaffolds after spinal cord injury

2015 ◽  
Vol 22 (1) ◽  
pp. 136-142 ◽  
Author(s):  
Kenta Takashima ◽  
Masato Hoshino ◽  
Kentaro Uesugi ◽  
Naoto Yagi ◽  
Shojiro Matsuda ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Spinal Cord ◽  
Tissue Engineering ◽  
Phase Contrast ◽  
Three Dimensional ◽  
Injured Spinal Cord ◽  
X Ray ◽  
Biodegradable Scaffolds ◽  
Cord Injury ◽  
Grating Interferometer

Tissue engineering strategies for spinal cord repair are a primary focus of translational medicine after spinal cord injury (SCI). Many tissue engineering strategies employ three-dimensional scaffolds, which are made of biodegradable materials and have microstructure incorporated with viable cells and bioactive molecules to promote new tissue generation and functional recovery after SCI. It is therefore important to develop an imaging system that visualizes both the microstructure of three-dimensional scaffolds and their degradation process after SCI. Here, X-ray phase-contrast computed tomography imaging based on the Talbot grating interferometer is described and it is shown how it can visualize the polyglycolic acid scaffold, including its microfibres, after implantation into the injured spinal cord. Furthermore, X-ray phase-contrast computed tomography images revealed that degradation occurred from the end to the centre of the braided scaffold in the 28 days after implantation into the injured spinal cord. The present report provides the first demonstration of an imaging technique that visualizes both the microstructure and degradation of biodegradable scaffolds in SCI research. X-ray phase-contrast imaging based on the Talbot grating interferometer is a versatile technique that can be used for a broad range of preclinical applications in tissue engineering strategies.

scholarly journals X-ray phase contrast imaging and noise evaluation using a single phase grating interferometer

2013 ◽  
Vol 21 (14) ◽  
pp. 17340 ◽  
Author(s):  
J. Rizzi ◽  
P. Mercère ◽  
M. Idir ◽  
P. Da Silva ◽  
G. Vincent ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Single Phase ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
Phase Grating ◽  
X Ray ◽  
Noise Evaluation ◽  
Grating Interferometer

scholarly journals X-ray dark-field and phase-contrast imaging using a grating interferometer

2009 ◽  
Vol 105 (10) ◽  
pp. 102006 ◽  
Author(s):  
F. Pfeiffer ◽  
M. Bech ◽  
O. Bunk ◽  
T. Donath ◽  
B. Henrich ◽  
...  
Keyword(s):  
Phase Contrast ◽  
Dark Field ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Grating Interferometer
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