US4733090A — Screens for storing X-ray images and methods for …

Claim 1

Independent Claim 107 words

A method of storing an image produced by x-ray exposure and releasing the stored image comprising: exposing an x-ray storage screen, comprised of an isotropic storage phosphor and a polymer coated on a support, to x-radiation of a first wavelength in an imagewise manner to store an image pattern in the storage screen, retrieving the image pattern from the storage screen by exposing the storage screen to radiation of a second wavelength, thereby stimulating radiation of a third wavelength, the polymer having an index of refraction which matches that of the phosphor at the second wavelength, and the support being non-reflective to radiation of the second wavelength.

Claim 2

Independent Claim 107 words

A method of storing an image produced by x-ray exposure and releasing the stored image comprising: exposing an x-ray storage screen, comprised of an isotropic storage phosphor and a polymer coated on a support, to x-radiation of a first wavelength in an imagewise manner to store an image pattern in the storage screen, retrieving the image pattern from the storage screen by exposing the storage screen to radiation of a second wavelength, thereby stimulating radiation of a third wavelength, the polymer having an index of refraction which matches that of the phosphor at the second wavelength, and the support being non-reflective to radiation of the second wavelength.

Claim 3

Dependent Claim 34 words

A method of storing an image according to claim 1 wherein the index of refraction of the polymer does not match the index of refraction of the phosphor for radiation of the third wavelength.

Claim 4

Dependent Claim 37 words

A method of storing an image according to claim 1 wherein the index of refraction of the polymer differs by more than 0.02 from the index of refraction of the phosphor for radiation of the third wavelength.

Claim 5

Dependent Claim 21 words

A method of storing an image according to claim 1 wherein the support is reflective to radiation of the third wavelength.

Claim 6

Dependent Claim 22 words

A method of storing an image according to claim 1 wherein the support exhibits minimum reflectance to radiation of the second wavelength.

Claim 7

Dependent Claim 38 words

A method according to claim 1 wherein the phosphor and the polymer form a fluorescent composition comprising (a) from 50 to 90 percent by weight of the phosphor and (b) from 10 to 50 percent of the polymer.

Claim 8

Dependent Claim 70 words

A method according to claim 6 wherein the polymer comprises: (i) from 5 to 100 mole percent of a copolymerizable ethylenically unsaturated monomer; and (ii) from 0 to 95 mole percent of recurring units having the formula ##STR7## wherein: Ar is arylene; R 1 is H or alkyl; R 2 is H, alkyl, aryl, or aralkyl; and R 4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.

Claim 9

Dependent Claim 88 words

A method according to claim 6 wherein the polymer comprises: (i) from 5 to 100 mole percent of recurring units having the formula: ##STR8## wherein: R 1 is H or alkyl; and R 2 is alkyl, cycloalkyl, aryl, aralkyl or aryl substituted with alkyl, alkoxy or heterocyclic; and (ii) from 0 to 95 mole percent of recurring units having the formula: ##STR9## wherein: Ar is arylene; R 3 is H, alkyl, aryl, or aralkyl; and R 4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.

Claim 10

Dependent Claim 94 words

A method according to claim 6 wherein the polymer comprises: (i) from 5 to 99 mole percent of recurring units having the formula: ##STR10## wherein: R 1 is H or alkyl; and R 2 is alkyl, cycloalkyl, aryl, aralkyl or aryl substituted with alkyl, alkoxy, or heterocyclic; and (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR11## wherein Ar is arylene; R 1 is H or alkyl; R 3 is H, alkyl, aryl, or aralkyl and R 4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.

Claim 11

Dependent Claim 138 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising: (i) from 5 to 99 mole percent of recurring units having the formula: ##STR12## (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR13##

Claim 12

Dependent Claim 138 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising: (i) from 5 to 99 mole percent of recurring units having the formula: ##STR12## (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR13##

Claim 13

Dependent Claim 139 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phoshor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising: (i) from 5 to 100 mole percent of a copolymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of a copolymerizable naphthyl carbinyl thioacrylate monomer.

Claim 14

Dependent Claim 139 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phoshor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising: (i) from 5 to 100 mole percent of a copolymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of a copolymerizable naphthyl carbinyl thioacrylate monomer.

Claim 15

Dependent Claim 139 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising (i) from 5 to 99 mole percent of a copolymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 1 to 95 mole percent of a copolymerizable naphthyl carbinyl thioacrylate monomer.

Claim 16

Dependent Claim 139 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising (i) from 5 to 99 mole percent of a copolymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 1 to 95 mole percent of a copolymerizable naphthyl carbinyl thioacrylate monomer.

Claim 17

Dependent Claim 136 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising: (i) from 5 to 100 mole percent of polymerized 1-naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of polymerized S-(1-naphthyl carbinyl)thioacrylate monomer.

Claim 18

Dependent Claim 136 words

An x-ray storage screen comprising: (a) a substantially isotropic storage phosphor, said phosphor being excitable by radiation of a first wavelength and, when thereafter said screen is exposed to radiation of a second wavelength, said phosphor emits radiation of a third wavelength; and (b) a polymer having an index of refraction which matches that of said phosphor at the second wavelength; and (c) said support being non-reflective to radiation of the second wavelength, said phosphor and said polymer forming a fluorescent composition comprising (a) from 50 to 90 percent by weight of said phosphor and (b) from 10 to 50 percent by weight of said polymer, and said polymer comprising: (i) from 5 to 100 mole percent of polymerized 1-naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of polymerized S-(1-naphthyl carbinyl)thioacrylate monomer.

Claim 19

Dependent Claim 23 words

An x-ray storage screen according to claim 16 wherein said fluorescent composition is coated on a black anodized aluminum surface of said support.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1991-03-22	1991-09-21	1992-03-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1995-03-22	1995-09-21	1996-03-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1999-03-22	1999-09-21	2000-03-22	$7700.00	Window Closed / Lapsed

Screens for storing X-ray images and methods for their use

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