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Raster imaging system and its scanning method

A technology of raster imaging and scanning method, which is applied in the field of raster imaging system and its scanning, and can solve the problems of the hazard of the measured object, the inability to process the raster, and the time consuming.

Active Publication Date: 2022-04-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A larger imaging field of view also means a larger grating group, and the current grating manufacturing process cannot be processed in one go
Similarly, for the traditional grating imaging method, the measured object is generally scanned by moving relative to the grating, and the scanning process is more complicated; in addition, the traditional phase step scanning is time-consuming, and the radiation dose is high, which is harmful to the measured object.

Method used

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  • Raster imaging system and its scanning method
  • Raster imaging system and its scanning method
  • Raster imaging system and its scanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] One aspect of the present invention provides a grating imaging system, such as figure 1 As shown, the system includes a source grating G0, a first grating G1 and a second grating G2 arranged in sequence along the optical path, wherein: the source grating G0 is used to convert the incoherent light emitted from the light source into coherent light, and a plurality of first gratings A first grating G1 formed by splicing grating units is used to obtain a first image after coherent light passes through the first grating G1; and a second grating G2 formed by splicing a plurality of second grating units is used to operate and acquire the first image The second imaging; wherein, an imaging irradiation position is set between the first grating G1 and the second grating G2. In other words, the source grating G0, the first grating G1 and the second grating G2 form an optical path to form a system.

[0055] Specifically, as an embodiment of the present invention, the light source ...

Embodiment 2

[0106] Another aspect of the present invention provides a grating imaging system, the system includes a source grating G0, a first grating G1 and a second grating G2 sequentially arranged along an optical path, wherein: the source grating G0, the first grating G1 and the second grating G2 At least one of them is a curved grating, and an imaging irradiation position is set between the first grating G1 and the second grating G2.

[0107] As an embodiment of the present invention, as Figure 8 As shown, the system includes a source grating G0, a first grating G1 and a second grating G2 sequentially arranged along the optical path to form a grating group of the system, wherein: the source grating G0 is used to convert the incoherent light emitted from the light source into coherent light light; a first grating G1, for acquiring a first image after coherent light passes through the first grating G1; and a second grating G2, for operating the first imaging to acquire a second image....

Embodiment 3

[0154] Another aspect of the present invention provides a grating imaging system, characterized in that, the system includes a source grating G0, a first grating G1 and a second grating G2 sequentially arranged along the optical path, wherein:

[0155] The first grating G1 includes a plurality of first grating units that are staggered and spliced ​​with each other; and / or the second grating G2 includes a plurality of second grating units that are staggered and spliced ​​with each other,

[0156] Wherein, the multiple first grating units or the multiple second grating units are displaced along the grid directions of the corresponding first grating units or the second grating units.

[0157] Specifically, as an embodiment of the present invention, as Figure 10 As shown, the light source is an X-ray light source, and the X-ray beam emitted by the light source generates a series of partially coherent linear lights through the source grating G0. In addition, the X light source of...

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Abstract

The invention discloses a grating imaging system, which comprises a source grating (G0), a first grating (G1) and a second grating (G2) arranged in sequence along an optical path, wherein: the first grating (G1) includes A plurality of first grating units that are spliced ​​with each other; and / or the second grating (G2) includes a plurality of second grating units that are spliced ​​with each other. The large-area grating formed by dislocation splicing can complete the imaging with only one scan in the actual scanning imaging process, and the scanning speed is faster, which further improves the scanning efficiency. The large field of view grating imaging system has the advantages and characteristics of large imaging field of view, fast scanning speed, and low radiation dose.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a grating imaging system and a scanning method thereof. Background technique [0002] X-ray grating phase contrast imaging technology can achieve local structure resolution at the micron or sub-micron level, which is a good complement to traditional X-ray imaging technology. The technology can simultaneously extract three kinds of information of absorption, phase contrast and dark field images, and is suitable for distinguishing between low atomic number and low density substances, especially for biological soft tissue structures including breast. In order to obtain better image quality, raster imaging technology usually acquires data by means of phase stepping. This method refers to equidistant displacement of one of the gratings in one or more cycles along the direction perpendicular to the grating grid lines, so as to obtain the displacement curve before and after pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/06
CPCA61B6/06A61B6/44
Inventor 张丽陈志强高河伟李新斌邢宇翔
Owner TSINGHUA UNIV