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X-ray refractive-contrasting CT data collection method and reconstruction method

A data acquisition and X-ray technology, applied in the direction of material analysis, measuring devices, instruments, etc. using wave/particle radiation, can solve problems such as not satisfying the reconstruction function conditions

Inactive Publication Date: 2007-05-23
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

Although the refractive index gradient component is a scalar, it is still a rotation variable and still does not satisfy the reconstruction function condition

Method used

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  • X-ray refractive-contrasting CT data collection method and reconstruction method
  • X-ray refractive-contrasting CT data collection method and reconstruction method
  • X-ray refractive-contrasting CT data collection method and reconstruction method

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Embodiment Construction

[0051] According to the basic optical path of diffraction-enhanced imaging shown in Figure 1, the monochromator crystal, the sample stage, the analysis crystal and the imaging detector are arranged in sequence on the optical path, and the Bragg angle of the monochromator crystal is adjusted to determine the monochromator of the irradiated sample. Adjust the angle of the analysis crystal, use the ionization chamber to measure the rocking curve of the double crystal, and then fix the angle between the analysis crystal and the monochromator crystal at the left half of the rocking curve (low angle position) and the right side of the rocking curve, respectively. Half waist (high angle position), align with the imaging detector.

[0052] According to the diffraction-enhanced CT optical path shown in Figure 2(a), the rotation axis of the sample is placed perpendicular to the crystal rotation axis, (the direction of the crystal rotation axis is parallel to the X-axis), and the analysis...

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Abstract

The invention relates to a computer imaging technique, especially an X-ray CT data collecting method and rebuilding method, wherein the invention uses diffraction strengthen waist imaging method to use two methods that sample rotation axle is vertical to crystal rotation axle and sample rotation axle is parallel to the crystal rotation axle, to combine and convert collected four groups of CT data, to make rebuild function meet rotation constant property, and use traditional CT method to rebuild the three-dimension distribution of three refractive indexes. And said method comprises that: S1, finding the conditions of X-ray diffraction strengthen waist image; S2, collecting four groups of CT data; S3, combining and converting CT groups, to meet rotation constant property; S43, using traditional CT method to rebuild the three-dimension distribution of refractive indexes in sample.

Description

technical field [0001] The invention relates to the technical field of computed tomography imaging. It is an X-ray refraction contrast CT data acquisition method and reconstruction method different from the traditional X-ray CT data acquisition method and reconstruction method. Background technique [0002] Since the rapid development of traditional computer tomography (Computed Tomography, CT) technology in the 1970s, it has become relatively mature, and has made remarkable progress in data acquisition, reconstruction methods and applications, and has become a An important tool in fields such as medicine, biology, archaeology, and materials science. The physical basis of the traditional CT principle is the difference in the absorption of X-rays by matter, and the mathematical basis is Radon transformation. Therefore, traditional CT technology is a combination of X-ray absorption contrast rotational projection imaging technology and Rayden transform. Because biomedical sa...

Claims

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Application Information

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IPC IPC(8): A61B6/03G01N23/00
Inventor 朱佩平王寯越袁清习黄万霞舒航吴自玉
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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