&lt;title&gt;X-ray diffraction computed tomography: a survey and description&lt;/title&gt;

Kleuker, Ulf

doi:10.1117/12.292722

Cited by 5 publications

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“…The former can be overcome by using an intense and well defined incident beam, like those obtained at a synchrotron. This paper deals specifically with X-ray diffraction (XRD) scatter tomography as has been previously demonstrated (Harding et al, 1987;Grant et al, 1995;Kleuker, 1997). In this method the scattered radiation originates from diffracted X-rays from crystalline regions within the object.…”

Section: Introductionmentioning

confidence: 99%

A new approach to synchrotron energy-dispersive X-ray diffraction computed tomography

Lazzari

Egan

Jacques

et al. 2012

J Synchrotron Radiat

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A new data collection strategy for performing synchrotron energy-dispersive X-ray diffraction computed tomography has been devised. This method is analogous to angle-dispersive X-ray diffraction whose diffraction signal originates from a line formed by intersection of the incident X-ray beam and the sample. Energy resolution is preserved by using a collimator which defines a small sampling voxel. This voxel is translated in a series of parallel straight lines covering the whole sample and the operation is repeated at different rotation angles, thus generating one diffraction pattern per translation and rotation step. The method has been tested by imaging a specially designed phantom object, devised to be a demanding validator for X-ray diffraction imaging. The relative strengths and weaknesses of the method have been analysed with respect to the classic angle-dispersive technique. The reconstruction accuracy of the method is good, although an absorption correction is required for lower energy diffraction because of the large path lengths involved. The spatial resolution is only limited to the width of the scanning beam owing to the novel collection strategy. The current temporal resolution is poor, with a scan taking several hours. The method is best suited to studying large objects (e.g. for engineering and materials science applications) because it does not suffer from diffraction peak broadening effects irrespective of the sample size, in contrast to the angle-dispersive case.

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Section: Introductionmentioning

confidence: 99%

A new approach to synchrotron energy-dispersive X-ray diffraction computed tomography

Lazzari

Egan

Jacques

et al. 2012

J Synchrotron Radiat

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“…Material-selective images were obtained by tomographically reconstructing the azimuthally integrated signal in angular intervals that contained a material-specific diffraction maximum. By reconstructing images from the attenuation-corrected signals sampled in all angular intervals, radial profiles can be locally reassembled from the pixel values of those images (Kleuker 1997). Recently, Westmore et al (1997) showed that, using a least-squares fit (LSF), material-selective images can be obtained by decomposing these restored radial profiles pixel-by-pixel using the known diffraction profiles, here called basis functions, of the components in the sample.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of x-ray diffraction computed tomography for medical imaging

et al. 1998

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A feasibility study of soft-tissue imaging based on x-ray wide-angle diffraction contrast has been performed at the medical beamline of the European Synchrotron Radiation Facility (ESRF). The technique employs computed-tomography algorithms to reconstruct from one data set the spatial distribution of several tissues differentiated by their diffraction properties. Radial diffraction profiles are measured in parallel projections from the sample and decomposed into material-selective weighting factors, which form the sinograms for the reconstructions. Attenuation effects--inherent in imaging techniques using scattered radiation--are efficiently corrected for by a ray-tracing method applied to the corresponding absorption image. Images of 7 cm diameter samples composed of fat, bone and muscle were generated at 60 and 80 keV x-ray energy. The highest surface-absorbed dose was 24 mGy, but substantial contrast could still be obtained at 7 mGy, indicating potential applicability in medical imaging. The dominant noise contribution in the images stems from the detection system, pointing to a possible decrease in the surface-absorbed dose for an optimized system of more than a factor of 2.

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Simple method for estimating linear attenuation coefficients from x-ray diffraction tomography data

Pavlov

Kewish

Davis

et al. 2001

Review of Scientific Instruments

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In this article, we demonstrate how the spatial distribution of x-ray linear attenuation coefficients within an object can be estimated from x-ray diffraction tomography data. The experimental arrangement to achieve this exploits a position sensitive detector and an analyzer crystal. The quality of reconstructed maps of linear attenuation coefficients is comparable to results obtained from conventional transmission computed tomography.

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<title>X-ray diffraction computed tomography: a survey and description</title>

Cited by 5 publications

References 0 publications

A new approach to synchrotron energy-dispersive X-ray diffraction computed tomography

A new approach to synchrotron energy-dispersive X-ray diffraction computed tomography

Feasibility study of x-ray diffraction computed tomography for medical imaging

Simple method for estimating linear attenuation coefficients from x-ray diffraction tomography data

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