Elemental Contrast X-ray Tomography Using Ross Filter Pairs with a Polychromatic Laboratory Source

Arhatari, Benedicta D.; Gureyev, T. E.; Abbey, Brian

doi:10.1038/s41598-017-00304-7

Cited by 17 publications

(15 citation statements)

References 34 publications

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“…However, extra data processing steps and calibration are required. Instead of changing tube energy, Ross-pair filters can also be utilized to produce tunable X-rays with defined energy bandwidths [ 77 ]. In terms of the K-edge energy of Rh, a combination of two filter pairs of Nb/Mo and Pd/Ag was selected for the LB XRT to identify the Rh in the Al foam.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Zhang

Wang

2018

Materials

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Although X-rays generated from a laboratory-based tube cannot be compared with synchrotron radiation in brilliance and monochromaticity, they are still viable and accessible in-house for ex situ or interrupted in situ X-ray tomography. This review mainly demonstrates recent works using laboratory X-ray tomography coupled with the measurements of properties or performance testing under various conditions, such as thermal, stress, or electric fields. Evolvements of correlated internal structures for some typical materials were uncovered. The damage features in a graded metallic 3D mesh and a metallic glass under mechanical loading were revealed and investigated. Micro-voids with thermal treatment and void healing phenomenon with electropulsing were clearly demonstrated and quantitatively analyzed. The substance transfer around an electrode of a Li-S battery and the protective performance of a Fe-based metallic glass coating on stainless steel were monitored through electrochemical processes. It was shown that in situ studies of the laboratory X-ray tomography were suitable for the investigation of structure change under controlled conditions and environments. An extension of the research for in situ laboratory X-ray tomography can be expected with supplementary novel techniques for internal strain, global 3D grain orientation, and a fast tomography strategy.

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Section: Introductionmentioning

confidence: 99%

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Zhang

Wang

2018

Materials

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“…1b). Although KES imaging at a polychromatic laboratory source has been demonstrated recently using a Ross filter arrangement 6 or a multi-bin photon counting detector 7,8 , there are disadvantages such as the absorption of a large amount of the X-ray flux in the filter pairs leading to long acquisition times. Also the development of 2D pixelated spectroscopic detectors allow KES imaging at a laboratory X-ray source 9,10 .…”

Section: Introductionmentioning

confidence: 99%

K-edge Subtraction Computed Tomography with a Compact Synchrotron X-ray Source

Kulpe

Dierolf

Günther

et al. 2019

Sci Rep

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In clinical diagnosis, X-ray computed tomography (CT) is one of the most important imaging techniques. Yet, this method lacks the ability to differentiate similarly absorbing substances like commonly used iodine contrast agent and calcium which is typically seen in calcifications, kidney stones and bones. K-edge subtraction (KES) imaging can help distinguish these materials by subtracting two CT scans recorded at different X-ray energies. So far, this method mostly relies on monochromatic X-rays produced at large synchrotron facilities. Here, we present the first proof-of-principle experiment of a filter-based KES CT method performed at a compact synchrotron X-ray source based on inverse-Compton scattering, the Munich Compact Light Source (MuCLS). It is shown that iodine contrast agent and calcium can be clearly separated to provide CT volumes only showing one of the two materials. These results demonstrate that KES CT at a compact synchrotron source can become an important tool in pre-clinical research.

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“…With a Ross filter system the spectrum can be filtered/shaped such that only the parts of the spectrum directly below and above the K-edge remain for imaging [26]. The advantage of this method is that the filter pairs provide a very well-defined and sharp energy window [27]. Yet, a large amount of the X-ray flux is absorbed in the filters reducing the statistics in the images [28].…”

Section: Discussionmentioning

confidence: 99%

K-edge subtraction imaging for coronary angiography with a compact synchrotron X-ray source

et al. 2018

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About one third of all deaths worldwide can be traced back to cardiovascular diseases. An interventional radiology procedure for their diagnosis is Digital Subtraction Angiography (DSA). An alternative to DSA is K-Edge subtraction (KES) imaging, which has been shown to be advantageous for moving organs and eliminating image artifacts caused by patient movement. As highly brilliant, monochromatic X-rays are required for this method, it has been limited to synchrotron facilities so far, restraining the feasibility in clinical routine. Compact synchrotron X-ray sources based on inverse Compton scattering, which have been evolving substantially over the past decade, provide X-rays with sufficient brilliance that meet spatial and financial requirements affordable in laboratory settings or for university hospitals. In this work, we demonstrate a first proof-of-principle K-edge subtraction imaging experiment using the Munich Compact Light Source (MuCLS), the first user-dedicated installation of a compact synchrotron X-ray source worldwide. It is shown experimentally that the technique of KES increases the visibility of small blood vessels overlaid by bone structures.

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Elemental Contrast X-ray Tomography Using Ross Filter Pairs with a Polychromatic Laboratory Source

Cited by 17 publications

References 34 publications

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

Correlation of Materials Property and Performance with Internal Structures Evolvement Revealed by Laboratory X-ray Tomography

K-edge Subtraction Computed Tomography with a Compact Synchrotron X-ray Source

K-edge subtraction imaging for coronary angiography with a compact synchrotron X-ray source

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