scholarly journals Validation of x-ray microfocus computed tomography as an imaging tool for porous structures

2008 ◽  
Vol 79 (1) ◽  
pp. 013711 ◽  
Author(s):  
G. Kerckhofs ◽  
J. Schrooten ◽  
T. Van Cleynenbreugel ◽  
S. V. Lomov ◽  
M. Wevers
Keyword(s):  
Computed Tomography ◽  
Porous Structures ◽  
X Ray ◽  
Imaging Tool ◽  
Microfocus Computed Tomography

scholarly journals X-ray Fluorescence Computed Tomography (XFCT) Imaging with a Superfine Pencil Beam X-ray Source

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 236
Author(s):  
Ignacio O. Romero ◽  
Yile Fang ◽  
Michael Lun ◽  
Changqing Li
Keyword(s):  
Computed Tomography ◽  
Molecular Imaging ◽  
Imaging System ◽  
Pencil Beam ◽  
X Ray ◽  
Mm Algorithm ◽  
Imaging Tool ◽  
Good Target ◽  
Reconstructed Signal ◽  
Detector Placement

X-ray fluorescence computed tomography (XFCT) is a molecular imaging technique that can be used to sense different elements or nanoparticle (NP) agents inside deep samples or tissues. However, XFCT has not been a popular molecular imaging tool because it has limited molecular sensitivity and spatial resolution. We present a benchtop XFCT imaging system in which a superfine pencil-beam X-ray source and a ring of X-ray spectrometers were simulated using GATE (Geant4 Application for Tomographic Emission) Monte Carlo software. An accelerated majorization minimization (MM) algorithm with an L1 regularization scheme was used to reconstruct the XFCT image of molybdenum (Mo) NP targets. Good target localization was achieved with a DICE coefficient of 88.737%. The reconstructed signal of the targets was found to be proportional to the target concentrations if detector number, detector placement, and angular projection number are optimized. The MM algorithm performance was compared with the maximum likelihood expectation maximization (ML-EM) and filtered back projection (FBP) algorithms. Our results indicate that the MM algorithm is superior to the ML-EM and FBP algorithms. We found that the MM algorithm was able to reconstruct XFCT targets as small as 0.25 mm in diameter. We also found that measurements with three angular projections and a 20-detector ring are enough to reconstruct the XFCT images.

scholarly journals Characterizing soil macroporosity by X-ray microfocus computed tomography and quantification of the coring damages.

2010 ◽  
Vol 6 ◽  
pp. 22023
Author(s):  
J. Gallier ◽  
F. Hubert ◽  
J.C. Robinet ◽  
P. Sardini ◽  
L. Caner
Keyword(s):  
Computed Tomography ◽  
X Ray ◽  
Microfocus Computed Tomography

scholarly journals A Review of Ex Vivo X-ray Microfocus Computed Tomography-Based Characterization of the Cardiovascular System

2021 ◽  
Vol 22 (6) ◽  
pp. 3263
Author(s):  
Lisa Leyssens ◽  
Camille Pestiaux ◽  
Greet Kerckhofs
Keyword(s):  
Computed Tomography ◽  
Soft Tissues ◽  
Ex Vivo ◽  
Image Resolution ◽  
Tissue Preparation ◽  
X Ray ◽  
Spatial Image ◽  
Microfocus Computed Tomography

Cardiovascular malformations and diseases are common but complex and often not yet fully understood. To better understand the effects of structural and microstructural changes of the heart and the vasculature on their proper functioning, a detailed characterization of the microstructure is crucial. In vivo imaging approaches are noninvasive and allow visualizing the heart and the vasculature in 3D. However, their spatial image resolution is often too limited for microstructural analyses, and hence, ex vivo imaging is preferred for this purpose. Ex vivo X-ray microfocus computed tomography (microCT) is a rapidly emerging high-resolution 3D structural imaging technique often used for the assessment of calcified tissues. Contrast-enhanced microCT (CE-CT) or phase-contrast microCT (PC-CT) improve this technique by additionally allowing the distinction of different low X-ray-absorbing soft tissues. In this review, we present the strengths of ex vivo microCT, CE-CT and PC-CT for quantitative 3D imaging of the structure and/or microstructure of the heart, the vasculature and their substructures in healthy and diseased state. We also discuss their current limitations, mainly with regard to the contrasting methods and the tissue preparation.

X-ray microtomography

1988 ◽  
Vol 46 ◽  
pp. 998-999
Author(s):  
H.W. Deckman ◽  
B.F. Flannery ◽  
J.H. Dunsmuir ◽  
K.D' Amico
Keyword(s):  
Computed Tomography ◽  
Internal Structure ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Tissue Structure ◽  
Individual Element ◽  
X Ray ◽  
Non Invasive ◽  
Panoramic Imaging ◽  
Three Dimensional Images

We have developed a new X-ray microscope which produces complete three dimensional images of samples. The microscope operates by performing X-ray tomography with unprecedented resolution. Tomography is a non-invasive imaging technique that creates maps of the internal structure of samples from measurement of the attenuation of penetrating radiation. As conventionally practiced in medical Computed Tomography (CT), radiologists produce maps of bone and tissue structure in several planar sections that reveal features with 1mm resolution and 1% contrast. Microtomography extends the capability of CT in several ways. First, the resolution which approaches one micron, is one thousand times higher than that of the medical CT. Second, our approach acquires and analyses the data in a panoramic imaging format that directly produces three-dimensional maps in a series of contiguous stacked planes. Typical maps available today consist of three hundred planar sections each containing 512x512 pixels. Finally, and perhaps of most import scientifically, microtomography using a synchrotron X-ray source, allows us to generate maps of individual element.

X-Ray Computed Tomography of Ultralightweight Metals

1999 ◽  
Vol 11 (1) ◽  
pp. 199-211
Author(s):  
J. M. Winter ◽  
R. E. Green ◽  
A. M. Waters ◽  
W. H. Green
Keyword(s):  
Computed Tomography ◽  
X Ray ◽  
X Ray Computed
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