Digital radiography detector

Patent metadata

Field	Value
Publication number	US-9869778-B2
Application number	US-201314439703-A
Country	US
Kind code	B2
Filing date	Nov 8, 2013
Priority date	Nov 15, 2012
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

Described is a scintillator screen including a plurality of filaments. Each of the plurality of filaments includes scintillating particles dispersed within a thermoplastic polymer. The thermoplastic polymer includes an elastic additive. The scintillating particles are from about 10 volume percent to about 60 volume percent of each of the plurality of filaments. Each of the plurality of filaments has a refractive index of greater than or equal to 1.5. The plurality of filaments are substantially parallel to each other and are at a volume packing of from about 60 percent to about 90 percent.

First claim

The invention claimed is:

1. A scintillator screen comprising:
a plurality of melt compounded and extruded filaments, wherein each of the plurality of filaments includes prompt emitting phosphor scintillating particles dispersed within a thermoplastic polymer, wherein the thermoplastic polymer includes an elastic additive, wherein the scintillating particles are from about 10 volume percent to about 60 volume percent of each of the plurality of filaments, wherein each of the plurality of filaments has a refractive index of greater than or equal to 1.5, and wherein the plurality of filaments are substantially parallel to each other and at a volume packing of from about 60 percent to about 90 percent.

2. The scintillator screen according to claim 1 , wherein each of the plurality of filaments have a diameter of from about 10 microns to about 40 microns.

3. The scintillator screen according to claim 1 , wherein the plurality of filaments have a storage modulus greater than or equal to 1000 dynes/cm 2 .

4. The scintillator screen according to claim 1 , wherein each of the plurality of filaments have a length of from about 100 microns to about 1 mm, wherein the thermoplastic polymer is selected from the group consisting of: polyethylene, polypropylene and polybutylene.

5. The scintillator screen according to claim 1 , wherein the elastic additive comprises alkylene vinyl acetate, wherein the thermoplastic polymer and the alkylene vinyl acetate are present in a ratio of from about 95 to 5 to about 80 to 20 in each of the plurality of filaments.

6. The scintillator screen according to claim 1 , wherein the scintillator particles are selected from the group consisting of: Gd 2 O 2 S:Tb, Gd 2 O 2 S:Eu, Gd 2 O 3 :Eu, La 2 O 2 S:Tb, La 2 O 2 S, Y 2 O 2 S:Tb, CsI:Tl, CsI:Na, CsBr:Tl, NaI:Tl, CaWO 4 , CaWO 4 :Tb, BaFBr:Eu, BaFCl:Eu, BaSO 4 :Eu, BaSrSO 4 , BaPbSO 4 , BaAl 12 O 19 :Mn, BaMgAl 10 O 17 :Eu, Zn 2 SiO 4 :Mn, (Zn,Cd)S:Ag, LaOBr, LaOBr:Tm, Lu 2 O 2 S:Eu, Lu 2 O 2 S:Tb, LuTaO 4 , HfO 2 :Ti, HfGeO 4 :Ti, YTaO 4 , YTaO 4 :Gd, YTaO 4 :Nb, Y 2 O 3 :Eu, YBO 3 :Eu, YBO 3 :Tb, and (Y,Gd)BO 3 :Eu, wherein the scintillator particles have a size of from about 50 nm to about 15 microns.

7. The scintillator screen according to claim 1 , further comprising:
a flat panel detector disposed on the scintillator screen; and
a substrate layer disposed on the scintillator screen opposite the flat panel detector, wherein the substrate layer includes a base plate, a black layer and a white layer.

8. A scintillator screen comprising:
a plurality of melt compounded and extruded filaments having a core and a shell surrounding the core, wherein the core of each of the plurality of filaments includes prompt emitting phosphor scintillating particles dispersed within a polymer, wherein the polymer includes a polypropylene and an elastic additive, wherein the scintillating particles are from about 10 volume percent to about 60 volume percent of each of the plurality of filaments, wherein the shell of the plurality of filaments does not include prompt emitting phosphor scintillating particles and has a refractive index of greater than or equal to 1.5, wherein the plurality of filaments have a storage modulus greater than or equal to 1000 dynes/cm 2 , and wherein the plurality of filaments are substantially parallel to each other at a volume packing of from about 60 percent to about 90 percent.

9. The scintillator screen according to claim 8 , wherein the shell has a thickness of from about 1 micron to about 10 microns.

10. The scintillator screen according to claim 8 , wherein the elastic additive comprises alkylene vinyl acetate, wherein the polypropylene and elastic additive comprise a weight ratio of from about 95:5 to about 80:20.

11. A scintillator screen comprising:
a plurality of fibers having a core and a shell surrounding the core, wherein the core of each of the plurality of fibers includes prompt emitting phosphor scintillating particles dispersed within a thermoplastic polyolefin, where the thermoplastic polyolefin includes an elastic additive, where the elastic additive is an alkylene vinyl acetate, wherein the scintillating particles are from about 10 volume percent to about 60 volume percent of each of the plurality of fibers, wherein the shell of the plurality of fibers does not include prompt emitting phosphor scintillating particles and has a refractive index of greater than or equal to 1.5, and wherein the plurality of fibers are substantially parallel to each other at a volume packing of from about 60 percent to about 90 percent.

Assignees

• Carestream Health Inc

Inventors

• Jagannathan Seshadri
• Rankin Charles M
• Gruszczynski David
• Inglese Jean-Marc
• Bishop Kevin L
• Lombardo Richard A

Classifications

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• G21K2004/08

  with a binder in the phosphor layer · CPC title

• D04H1/74

  the fibres being orientated, e.g. in parallel {(anisotropic fleeces)} · CPC title

• G21K4/00

  Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens (photographic processes using X-ray intensifiers G03C5/17; discharge tubes comprising luminescent screens H01J1/62; cathode ray tubes for X-ray conversion with optical output H01J31/50) · CPC title

• C09K11/7771 Primary

  Oxysulfides · CPC title