Radiation imaging panel, radiation imaging apparatus, radiation imaging system, and scintillator plate

Patent metadata

Field	Value
Publication number	US-2022018975-A1
Application number	US-202117366272-A
Country	US
Kind code	A1
Filing date	Jul 2, 2021
Priority date	Jul 14, 2020
Publication date	Jan 20, 2022
Grant date	—

Abstract

A radiation imaging panel is provided. The panel comprises a substrate on which a plurality of pixels each including a photoelectric conversion element are arranged, a scintillator arranged over the substrate, and a protective layer arranged so as to cover the scintillator. The scintillator includes a plurality of columnar crystals containing an alkali metal halide. The protective layer includes a resin layer containing a resin to which particles of a metal oxide are added. A thickness of the resin layer from an apex of each of the plurality of columnar crystals to an upper surface of the resin layer is not less than 10 μm and less than 30 μm, and a concentration of the particles in the resin layer is not less than 0.15 vol % and less than 7.5 vol %.

First claim

What is claimed is:

1 . A radiation imaging panel comprising:
a substrate on which a plurality of pixels each including a photoelectric conversion element are arranged; a scintillator arranged over the substrate; and a protective layer arranged so as to cover the scintillator, wherein the scintillator includes a plurality of columnar crystals containing an alkali metal halide, the protective layer includes a resin layer containing a resin to which particles of a metal oxide are added, a thickness of the resin layer from an apex of each of the plurality of columnar crystals to an upper surface of the resin layer is not less than 10 μm and less than 30 μm, and a concentration of the particles in the resin layer is not less than 0.15 vol % and less than 7.5 vol %.

2 . The panel according to claim 1 , wherein an average particle size of the particles is not less than 200 nm and not more than 500 nm.

3 . The panel according to claim 1 , wherein a refractive index of the particles is not less than 1.94 and not more than 2.72.

4 . The panel according to claim 1 , wherein the particles contain at least one selected from the group consisting of white lead, zinc oxide, and titanium oxide.

5 . The panel according to claim 1 , wherein the particles contain rutile-type titanium dioxide.

6 . The panel according to claim 1 , wherein a refractive index of the resin is not less than 1.49 and not more than 1.53.

7 . The panel according to claim 1 , wherein the resin is made of a nonvolatile thermoplastic material.

8 . The panel according to claim 7 , wherein the resin contains a hot melt resin.

9 . The panel according to claim 1 , wherein the resin contains a resin having pressure-sensitive adhesiveness obtained by an intermolecular force.

10 . The panel according to claim 9 , wherein the resin contains at least one selected from the group consisting of a urethane resin and an acrylic resin.

11 . The panel according to claim 1 , wherein the alkali metal halide contains cesium iodide.

12 . The panel according to claim 1 , wherein the protective layer further includes a base formed on a side of the resin layer, which is opposite to the scintillator.

13 . The panel according to claim 12 , wherein the protective layer further includes a metal layer formed between the resin layer and the base.

14 . A radiation imaging apparatus comprising:
the radiation imaging panel according to claim 1 ; and a controller configured to control the radiation imaging panel.

15 . A radiation imaging system comprising:
the radiation imaging apparatus according to claim 14 ; and a signal processing apparatus configured to process a signal output from the radiation imaging apparatus.

16 . A scintillator plate comprising:
a substrate; a scintillator arranged over the substrate; and a protective layer arranged so as to cover the scintillator, wherein the scintillator includes a plurality of columnar crystals containing an alkali metal halide, the protective layer includes a resin layer containing a resin to which particles of a metal oxide are added, a thickness of the resin layer from an apex of each of the plurality of columnar crystals to an upper surface of the resin layer is not less than 10 μm and less than 30 μm, and a concentration of the particles in the resin layer is not less than 0.15 vol % and less than 7.5 vol %.

17 . The plate according to claim 16 , wherein the substrate is a transparent substrate that transmits light generated by the scintillator.

Assignees

• Canon Kk

Inventors

• Saruta Shoshiro
• Nagano Kazumi
• Nomura Keiichi

Classifications

• H10F39/806

  Optical elements or arrangements associated with the image sensors · CPC title

• H10F39/024

  of coatings or optical elements · CPC title

• G01T1/208

  Circuits specially adapted for scintillation detectors, e.g. for the photo-multiplier section · CPC title

• G01T1/202 Primary

  the detector being a crystal · CPC title

• G01T1/2002

  Optical details, e.g. reflecting or diffusing layers · CPC title