Abstract
This article demonstrates how a combination of well-known tools—a standard 2D detector (CCD (charge-coupled device) camera) and a crystal analyzer—can improve the multimodality of X-ray imaging and tomographic sensing. The use of a crystal analyzer allowed two characteristic lines of the molybdenum anode— and —to be separated from the polychromatic radiation of the conventional X-ray tube. Thus, as a result of one measurement, three radiographic projections (images) were simultaneously recorded. The projection images at different wavelengths were separated in space and registered independently for further processing, which is of interest for the spectral tomography method. A projective transformation to compensate for the geometric distortions that occur during asymmetric diffraction was used. The first experimental results presented here appear promising.
Highlights
Various types of sensors and detectors exist
X-ray tomography is a logical continuation of the X-ray imaging technique
When using using aa crystal crystalanalyzer, analyzer,projection projectionimages imagesatatdifferent different wavelengths separated space and can be registered independently for further processing, which is of interest for the spectral in space and can be registered independently for further processing, which is of interest for the tomography method. method
Summary
Various types of sensors and detectors exist. In the X-ray range, examples include ionization chambers (gas discharge counters) [1,2], scintillation counters (chambers) [3] in which X-ray radiation is converted into visible light, or solid-state detectors [4,5,6,7], in which X-ray photons generate electron–hole pairs and the corresponding current is recorded. Where E0 (∼ 20 keV) is the average radiation energy and ∆E (∼ 2 keV) is the width of its spectrum Modeling even such a simple scheme to account for diffraction effects generates considerable practical difficulties associated with the small step of partitioning the spatial grid on which the integral transformations (Fresnel type) are calculated [14]. From a physical point of view, this means that the object is located on the detector surface (Figure 1c) In this case, all diffraction effects are ignored, including phase-contrast imaging based on free space propagation (in-line holography). All diffraction effects are ignored, including phase-contrast imaging based on free space propagation (in-line holography) This is important for tomographic methods of investigation using synchrotron-type sources, and it limits (affects) the resolution of tomographic schemes [15]. The correct approach is to develop reconstruction methods that allow working with more adequate models of tomographic projections
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