Radiation sensing thermoplastic composite panels

Patent metadata

Field	Value
Publication number	US-10120083-B2
Application number	US-201414289970-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	Jun 28, 2011
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A storage phosphor panel can include an extruded inorganic storage phosphor layer including a thermoplastic polyolefin and an inorganic storage phosphor material, where the extruded inorganic storage phosphor panel has a DQE comparable to that of a traditional extruded inorganic solvent coated inorganic storage phosphor screen. Also disclosed is an inorganic storage phosphor detection system including an extruded inorganic storage phosphor panel that can include an extruded inorganic storage phosphor layer including a thermoplastic olefin and an inorganic storage phosphor material; and photodetector(s) coupled to the extruded inorganic storage phosphor panel to detect photons generated from the extruded inorganic storage phosphor panel. Further disclosed is a method of making an extruded inorganic storage phosphor panel that can include providing thermoplastic particles including at least one thermoplastic polyolefin and an inorganic storage phosphor material; and melt extruding the thermoplastic particles to form an extruded inorganic storage phosphor layer.

First claim

What is claimed is:

1. An extruded inorganic storage phosphor panel comprising:
an extruded inorganic storage phosphor layer comprising a thermoplastic polyolefin and an inorganic storage phosphor material, where the extruded inorganic storage phosphor layer does not include a support and requires irradiation with a longer wavelength radiation, subsequent to x-ray exposure, for stimulated emission of light for detection, wherein the extruded inorganic storage phosphor panel has a detection quantum efficiency (DQE) that is within 10% of a solvent coated inorganic storage phosphor screen having similar x-ray absorbance at a spatial frequency of 6 line pairs/millimeter (lp/mm) or 8 lp/mm, where the storage phosphor used in the extruded inorganic storage phosphor panel and the solvent coated inorganic storage phosphor screen are the same.

2. The extruded inorganic storage phosphor panel of claim 1 , wherein the thermoplastic olefin comprises low density polyethylene.

3. The extruded inorganic storage phosphor panel of claim 1 , wherein the inorganic storage phosphor material comprises stimulable phosphor particles including europium activated barium fluorobromides, cerium activated alkaline earth metal halides, cerium activated oxyhalides, divalent europium activated alkaline earth metal fluorohalides, divalent europium activated alkaline earth metal halides, rare earth element activated rare earth oxyhalides, bismuth activated alkaline metal halide phosphors, and combinations thereof.

4. The extruded inorganic storage phosphor panel of claim 1 , wherein the inorganic storage phosphor material is present in the extruded inorganic storage phosphor layer in an amount ranging from about 50% by volume to about 99% by volume, relative to the volume of the extruded inorganic storage phosphor layer.

5. The extruded inorganic storage phosphor panel of claim 1 , wherein the inorganic storage phosphor material is present in the extruded inorganic storage phosphor layer in an amount ranging from about 70% by volume to about 90% by volume, relative to the volume of the extruded inorganic storage phosphor layer.

6. The extruded inorganic storage phosphor panel of claim 1 , further comprising an extruded opaque layer comprising carbon black.

7. The extruded inorganic storage phosphor panel of claim 1 , wherein the extruded inorganic storage phosphor layer comprises a thickness ranging from about 25 μm to about 1000 μm.

8. An inorganic storage phosphor detection system comprising:
an extruded inorganic storage phosphor panel comprising an extruded inorganic storage phosphor layer comprising a thermoplastic polyolefin and an inorganic storage phosphor material, where the extruded inorganic storage phosphor layer does not include a support and requires irradiation with a longer wavelength radiation, subsequent to x-ray exposure, for stimulated emission of light for detection, where the extruded inorganic storage phosphor panel has a detection quantum efficiency (DQE) that is within 10% of a solvent coated inorganic storage phosphor screen having similar x-ray absorbance at a spatial frequency of 6 line lp/mm or 8 lp/mm, where the storage phosphor used in the extruded inorganic storage phosphor panel and the solvent coated inorganic storage phosphor screen are the same; and
at least one photodetector coupled to the extruded inorganic storage phosphor panel, wherein at least one photodetector is configured to detect photons generated from the extruded inorganic storage phosphor panel.

9. The inorganic storage phosphor detection system of claim 8 , wherein the thermoplastic polyolefin comprises low density polyethylene and the inorganic storage phosphor material comprises stimulable phosphor particles including europium activated barium fluorobromides, cerium activated alkaline earth metal halides, cerium activated oxyhalides, divalent europium activated alkaline earth metal fluorohalides, divalent europium activated alkaline earth metal halides, rare earth element activated rare earth oxyhalides, bismuth activated alkaline metal halide phosphors, and combinations thereof.

10. The inorganic storage phosphor detection system of claim 8 , wherein the inorganic storage phosphor material is present in the extruded inorganic storage phosphor layer in an amount ranging from about 50% by volume to about 99% by volume, relative to the volume of the extruded layer.

11. The inorganic storage phosphor detection system of claim 8 , wherein the extruded inorganic storage phosphor panel further comprises an extruded opaque layer comprising carbon black.

12. The inorganic storage phosphor detection system of claim 8 , wherein the extruded inorganic storage phosphor layer comprises a thickness ranging from about 25 μm to about 1000 μm.

13. The inorganic storage phosphor detection system of claim 8 , wherein the at least one photodetector comprises at least one of photomultiplier tubes, photodiodes, phototransistors, charge coupled array devices, and combinations thereof.

14. A method of making an extruded inorganic storage phosphor panel comprising:
providing thermoplastic particles comprising at least one thermoplastic polyolefin and an inorganic storage phosphor material, where the inorganic storage phosphor material requires irradiation with a longer wavelength radiation, subsequent to x-ray exposure, for stimulated emission of light for detection; and
melt extruding the thermoplastic particles to form an extruded inorganic storage phosphor layer, where the extruded inorganic storage phosphor panel has a detection quantum efficiency (DQE) that is within 10% of a solvent coated inorganic storage phosphor screen having similar x-ray absorbance at a spatial frequency of 6 line lp/mm or 8 lp/mm, where the storage phosphor used in the extruded inorganic storage phosphor panel and the solvent coated inorganic storage phosphor screen are the same.

15. The method of claim 14 , wherein the thermoplastic particles are formed by melt compounding the thermoplastic polyolefin and the inorganic storage phosphor material through a plurality of heating zones for a period of time in each zone.

16. The method of claim 15 , wherein the period of time in each zone ranges from about 0.01 min to about 30 min.

Assignees

• Carestream Dental Tech Topco Ltd

Inventors

• Jagannathan Seshadri
• Yang Chang-Ying Joseph
• Bishop Kevin L
• Purdum Mark S

Classifications

• Y10T428/269

  including synthetic resin or polymer layer or component · CPC title

• G21K4/00 Primary

  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

• B29C48/022

  characterised by the choice of material · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title

• Y10T428/31913

  Monoolefin polymer · CPC title