Fast three-dimensional fluorescence CT system and fast three-dimensional fluorescence CT method based on synchrotron radiation

Abstract

The invention provides a fast three-dimensional florescence CT system based on synchrotron radiation. The system comprises a sample table for bearing a sample, a spectrum acquiring device and a data processor, wherein the spectrum acquiring device comprises a slit combination device, a plurality of tungsten plate collimators and a plurality of XIS collectors, wherein the slit combination device is used for modulating spot size of incident synchrotron radiation monochromatic light, the modulated monochromatic light is irradiated on the sample so that the sample is stimulated to emit an X-ray fluorescence signal; the plurality of tungsten plate collimators are parallel to the light path of the synchrotron radiation monochromatic light, are arranged around the sample at equal intervals and are provided with a plurality of pinholes; and the plurality of XIS collectors are arranged on the peripheries of the tungsten plate collimators in one-to-one corresponding manner, are used for acquiring the X-ray fluorescence signals penetrating through the corresponding tungsten plate collimator to acquire an X-ray fluorescence spectrum which is provided for reconstructing an element three-dimensional distribution image of the sample by the data processor. The acquiring speed of the three-dimensional X-ray fluorescence CT data is improved, and the fast three-dimensional reconstruction of the sample element space distribution is realized.

Description

technical field [0001] The invention relates to X-ray fluorescence imaging technology, in particular to a fast three-dimensional fluorescence CT system and method based on synchrotron radiation. Background technique [0002] The idea of ​​X-ray fluorescence computed tomography (X-Ray Fluorescence Computed Tomography, XFCT) method was first proposed by Biosseau in 1986. It is a combination of X-ray fluorescence analysis and computer tomography technology. The characteristic X-rays emitted by the stimulated elements in the path sample are collected, and the spatial distribution of the elements is obtained by means of computer reconstruction technology. This method has the advantages of multi-element simultaneous analysis and non-destructive testing, and is widely used in biomedicine, environmental science, archaeology, material science and other fields. [0003] Traditional X-ray fluorescence CT systems such as figure 1 As shown, it mainly includes a monochromator 2', a micr...

AI Technical Summary

Problems solved by technology

In order to improve the acquisition speed of X-ray fluorescence data, such as thin beam light source and array fluorescence detector have been adopted in this field to improve the acquisition speed to a certain extent, but it still takes a long time to obtain a set of three-dimensional fluorescence CT data

NaokiSunaguchi et al. proposed a three-dimensional fluorescence CT imaging system with a single pinhole collimator, detailed references Sunaguchi N, Yuasa T, Hyodo K, et al. Fluorescent x-ray computed tomography using the pinhole effect for biomedical applications [J]. Optics Communications, 2013, 297: 210-214, in this system, the sample does not need translation, but still needs to complete 180-degree rotation to obtain complete projection data, because the single pinhole constrains the fluorescent signal to reach the detection The throughput of the detector plane makes the acquisition time of a single fluorescence spectrum longer, thus limiting the application of this method

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