Journal ArticleDOI
Reconstructing x-ray fluorescence microtomograms
TLDR
In this article, a self-consistently estimated attenuation of the fluorescence radiation is used to estimate the attenuation inside the sample, which allows one to reconstruct relative concentrations.Abstract:
X-ray fluorescence microtomography allows one to map element distributions inside a sample with high sensitivity and resolutions in the micrometer range. Quantitative reconstruction of the element concentrations from the fluorescence data requires correction for the attenuation inside the sample. However, the attenuation of the fluorescence radiation is not directly accessible by experiment. The method described self-consistently estimates this attenuation and allows one to reconstruct relative concentrations. This is demonstrated on numerical as well as experimental data. A measure for the quality of the reconstruction is given.read more
Citations
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Book ChapterDOI
A Bit of History
TL;DR: Rontgen and the discovery of X rays as mentioned in this paper were the first to explore the possibility that X rays would exit thin-walled Hittorf-Crookes tubes, and they used a phosphor to try to observe the fluctuations of the glowing filament in the tube.
ReportDOI
X-Ray Tomographic Reconstruction
TL;DR: In this article, a program employing iterative methods based on the inverse Radon transform was written to correct the data in order to obtain the most accurate images from which element concentrations and internal structure can be determined.
Journal ArticleDOI
Joint Estimation of Metal Density and Attenuation Maps With Pencil Beam XFET
TL;DR: In this paper , a pencil-beam X-ray fluorescence emission tomography (XFET) system was used for direct metal measurement in the absence of attenuation using singular value decomposition on a simplified imaging model.
References
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Journal ArticleDOI
A microscope for hard x rays based on parabolic compound refractive lenses
Bruno Lengeler,Christian G. Schroer,M. Richwin,J. Tümmler,Michael Drakopoulos,Anatoly Snigirev,Irina Snigireva +6 more
TL;DR: In this article, refractive x-ray lenses with a parabolic profile are described, similar to glass lenses for visible light, which can operate in the range from 2 to 50 degrees of freedom, allowing for magnifications up to 50.
Journal ArticleDOI
Fluorescent computer tomography: a model for correction of X-ray absorption
TL;DR: In this article, the authors used the absorption density, measured using conventional absorption tomography, to remove absorption effects and compared the resulting corrected reconstructions with the reconstructions degraded by attenuation efforts.
Journal ArticleDOI
X-ray fluorescent computer tomography with synchrotron radiation
G.-F. Rust,J. Weigelt +1 more
TL;DR: In this paper, the authors describe the possibility of a quantitative calculation of the distribution of a nonradioactive element within a selected cross section with nondestructive methods with the help of X-ray fluorescent tomography (XFCT) in order to increase measurement sensitivity.
Journal ArticleDOI
Synchrotron hard x-ray microprobe: Fluorescence imaging of single cells
Sylvain Bohic,Alexandre Simionovici,A. A. Snigirev,Richard Ortega,Guillaume Devès,Dominique Heymann,Christian G. Schroer +6 more
TL;DR: In this paper, the authors used synchrotron-induced x-ray fluorescence (SXRF) in the hard X-ray range to image trace elements in single cells.
Journal ArticleDOI
High resolution tomography with chemical specificity
TL;DR: In this paper, a very fast method of computerized critical absorption tomography featuring ∼ 10 μm spatial resolution and high chemical sensitivity is described, which is especially suited to investigating small samples.
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