scholarly journals Introduction: a brief overview of iterative algorithms in X-ray computed tomography

2015 ◽  
Vol 373 (2043) ◽  
pp. 20140399 ◽  
Author(s):  
M. Soleimani ◽  
T. Pengpen
Keyword(s):  
Computed Tomography ◽  
High Performance ◽  
Large Scale ◽  
Krylov Subspace ◽  
Iterative Algorithms ◽  
Computational Time ◽  
X Ray ◽  
Reconstruction Software ◽  
X Ray Computed ◽  
Linear Systems Of Equations

This paper presents a brief overview of some basic iterative algorithms, and more sophisticated methods are presented in the research papers in this issue. A range of algebraic iterative algorithms are covered here including ART, SART and OS-SART. A major limitation of the traditional iterative methods is their computational time. The Krylov subspace based methods such as the conjugate gradients (CG) algorithm and its variants can be used to solve linear systems of equations arising from large-scale CT with possible implementation using modern high-performance computing tools. The overall aim of this theme issue is to stimulate international efforts to develop the next generation of X-ray computed tomography (CT) image reconstruction software.

Large-scale synthesis of PEGylated lutetium hydroxycarbonates as nanoparticulate contrast agents for X-ray CT imaging

2015 ◽  
Vol 39 (1) ◽  
pp. 589-594 ◽  
Author(s):  
Zhaogui Ba ◽  
Yumin Zhang ◽  
Junpei Wei ◽  
Jiwu Han ◽  
Zhenqiang Wang ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agents ◽  
High Performance ◽  
Large Scale ◽  
Ct Imaging ◽  
Systemic Toxicity ◽  
Computed Tomography Imaging ◽  
X Ray ◽  
Tomography Imaging ◽  
X Ray Computed

PEGylated lutetium hydroxycarbonate nanoparticles have been prepared via a large-scale strategy and successfully used as high-performance contrast agents for X-ray computed tomography imaging with neglectable systemic toxicity.

scholarly journals X-ray Computed Tomography Investigation of Structures in Claystone at Large Scale and High Speed

2015 ◽  
Vol 2015 (1) ◽  
pp. 1-2
Author(s):  
Gerhard Zacher ◽  
Thomas Paul ◽  
Annette Kaufhold ◽  
Werner Grasle
Keyword(s):  
Computed Tomography ◽  
High Speed ◽  
Large Scale ◽  
X Ray ◽  
X Ray Computed

A High-Performance Ytterbium-Based Nanoparticulate Contrast Agent for In Vivo X-Ray Computed Tomography Imaging

2011 ◽  
Vol 124 (6) ◽  
pp. 1466-1471 ◽  
Author(s):  
Yanlan Liu ◽  
Kelong Ai ◽  
Jianhua Liu ◽  
Qinghai Yuan ◽  
Yangyang He ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Contrast Agent ◽  
High Performance ◽  
Computed Tomography Imaging ◽  
X Ray ◽  
Tomography Imaging ◽  
X Ray Computed

scholarly journals Investigation of Spalling Damage in Ultra-High Performance Concrete Through X-ray Computed Tomography

2018 ◽  
Vol 183 ◽  
pp. 03024
Author(s):  
Maria Celeste Blasone ◽  
Dominique Saletti ◽  
Edward Andò ◽  
Julien Baroth ◽  
Pascal Forquin
Keyword(s):  
Computed Tomography ◽  
High Performance ◽  
Power Plants ◽  
High Performance Concrete ◽  
Tensile Loading ◽  
Engineering Structures ◽  
X Ray ◽  
Fracturing Process ◽  
X Ray Computed ◽  
Spalling Test

Ultra-high performance concretes (UHPC) are increasingly used to build protective structures such as headquarters, nuclear power plants or critical civil engineering structures. However, under impact or contact detonation, concrete is exposed to high-rate tensile loadings that can lead to intense damage modes. Such complex damage modes need to be correctly characterised. When a UHPC sample is subjected to a dynamic tensile loading by means of the spalling technique the post-mortem pattern shows a large number of fractures that cannot be seen with a classical observation of the external face (inner crack network). In the framework of the Brittle’s CODEX chair project, the fracturing process in spalled samples of UHPC is investigated with X-ray computed tomography. The tensile loading is applied thanks to a spalling technique that is based on the reflection of a compressive wave on a free boundary. The concrete samples are entirely scanned using X-ray tomography prior spalling test to identify the initial microstructure, and post spalling test to analyse the damage pattern. Image analysis tools are used in both steps. The main fracturing properties are related to the microstructure of the tested concrete.

scholarly journals X-ray computed tomography investigation of structures in Opalinus Clay from large-scale to small-scale after mechanical testing

Solid Earth ◽  
2016 ◽  
Vol 7 (4) ◽  
pp. 1171-1183 ◽  
Author(s):  
Annette Kaufhold ◽  
Matthias Halisch ◽  
Gerhard Zacher ◽  
Stephan Kaufhold
Keyword(s):  
Computed Tomography ◽  
Mechanical Testing ◽  
Large Scale ◽  
Data Interpretation ◽  
Radioactive Waste Disposal ◽  
Opalinus Clay ◽  
Small Scale ◽  
X Ray ◽  
Scale Down ◽  
X Ray Computed

Abstract. In the past years X-ray computed tomography (CT) has became more and more common for geoscientific applications and is used from the µm-scale (e.g. for investigations of microfossils or pore-scale structures) up to the dm-scale (full drill cores or soil columns). In this paper we present results from CT imaging and mineralogical investigations of an Opalinus Clay core on different scales and different regions of interest, emphasizing especially the 3-D evaluation and distribution of cracks and their impact on mechanical testing of such material. Enhanced knowledge of the testing behaviour of the Opalinus Clay is of great interest, especially since this material is considered for a long-term radioactive waste disposal and storage facility in Switzerland. Hence, results are compared regarding the mineral (i.e. phase) contrast resolution, the spatial resolution, and the overall scanning speed.With this extensive interdisciplinary scale-down approach it has been possible to characterize the general fracture propagation in comparison to mineralogical and textural features of the Opalinus Clay. Additionally, and as far as we know, a so-called mylonitic zone, located at an intersect of two main fractures, has been observed for the first time for an experimentally deformed Opalinus sample. The multi-scale results are in good accordance to data from naturally deformed Opalinus Clay samples, which enables us to perform systematical research under controlled laboratory conditions. Accompanying 3-D imaging greatly enhances the capability of data interpretation and assessment of such a material.

Nanopolymersomes with an Ultrahigh Iodine Content for High-Performance X-Ray Computed Tomography Imaging In Vivo

2017 ◽  
Vol 29 (10) ◽  
pp. 1603997 ◽  
Author(s):  
Yan Zou ◽  
Yaohua Wei ◽  
Guanglin Wang ◽  
Fenghua Meng ◽  
Mingyuan Gao ◽  
...  
Keyword(s):  
Computed Tomography ◽  
High Performance ◽  
Iodine Content ◽  
Computed Tomography Imaging ◽  
X Ray ◽  
Tomography Imaging ◽  
X Ray Computed
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