Grating and radiation imaging device

Patent metadata

Field	Value
Publication number	US-10643759-B2
Application number	US-201715802473-A
Country	US
Kind code	B2
Filing date	Nov 3, 2017
Priority date	Sep 8, 2015
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

The disclosure relates to a grating and a radiation imaging device. The grating comprises a plurality of stacked grating elements. The grating elements are stacked to form a grid. The grating element comprises a first sheet and a second sheet having two parallel planes. The second sheet is stacked at the first sheet in a length direction of the first sheet. The first sheet is almost impervious to radiation. The present disclosure stacks the sheets having different specifications together to form the grating with uniform grating slits, such that there is no limitation on the thickness of the grating and the grating can be used along with high-energy radiations.

First claim

What is claimed is:

1. A grating, comprising:
a plurality of stacked grating elements, wherein the grating elements are stacked to form a grid;
the grating element comprises a first sheet and a second sheet having two parallel planes;
the second sheet is stacked at the first sheet in a length direction of the first sheet;
the second sheet has a length smaller than that of the first sheet, and there are at least two second sheets; and
the second sheets are stacked at two ends on an identified surface of the first sheet in the length direction of the first sheet, such that a uniform grating slit is formed between adjacent first sheets, and the thickness of the second sheet determines a width of the grating slit.

2. The grating according to claim 1 , wherein the grating slit is filled with a material pervious to X-ray radiation.

3. The grating according to claim 1 , wherein the first sheet has a thickness different from that of the second sheet.

4. The grating according to claim 1 , wherein each of the first sheet and the second sheet has a thickness of about 0.001 to 3 millimeters.

5. The grating according to claim 1 , wherein the grating element further comprises a third sheet;
the third sheet has a length smaller than that of the first sheet, and at least three second sheets are stacked at the two ends and a middle position of an identical surface of the first sheet in the length direction of the first sheet; and
the third sheet is stacked on the first sheet between two of the second sheets.

6. The grating according to claim 5 , wherein the third sheet has a thickness smaller than that of the second sheet.

7. The grating according to claim 1 , wherein the first sheet is a tungsten alloy sheet.

8. The grating according to claim 7 , wherein the grating elements are bonded with adhesives or compressed with tools to be assembled into the grating.

9. The grating according to claim 1 , wherein the first sheet is impervious to X-ray radiation.

10. A radiation imaging device, comprising a grating comprising a plurality of stacked grating elements, wherein the grating elements are stacked to form a grid;
the grating element comprises a first sheet and a second sheet having two parallel planes;
the second sheet is stacked at the first sheet in a length direction of the first sheet; and
the second sheet has a length smaller than that of the first sheet, and there are at least two second sheets; and
the second sheets are stacked at two ends on an identified surface of the first sheet in the length direction of the first sheet, such that a uniform grating slit is formed between adjacent first sheets, and the thickness of the second sheet determines a width of the grating slit.

11. The radiation imaging device according to claim 10 , wherein the first sheet is impervious to X-ray radiation.

Assignees

• Univ Tsinghua
• Nuctech Co Ltd

Inventors

• Zhang Li
• Hong Mingzhi
• Huang Qingping
• Shen Le

Classifications

• G21K2207/005

  Methods and devices obtaining contrast from non-absorbing interaction of the radiation with matter, e.g. phase contrast · CPC title

• G02B5/1838

  for use with ultraviolet radiation or X-rays · CPC title

• G21K1/06 Primary

  using diffraction, refraction or reflection, e.g. monochromators (G21K1/10, G21K7/00 take precedence) · CPC title

• G21K2201/067

  Construction details · CPC title

• G21K1/025

  using multiple collimators, e.g. Bucky screens; other devices for eliminating undesired or dispersed radiation · CPC title