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US5367173A
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Method for recording and reproducing a radiation image, apparatus using said method, panel for storing the radiation image and photostimulable phosphor
Assignee: Tulalip Consultoria Comercial SU
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Filing: 1993-09-30
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Granted: 1994-11-22
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Expires: 2013-09-30
Abstract
Abstract The present invention relates to new phosphors for use in panels, apparatus and methods for recording and reproducing a high energy radiation image, including the steps of stimulating a phosphor image-wise exposed to radiation and detecting the fluorescent light emitted by said phosphor upon stimulation, said phosphor being a green emitting terbium activated alkali metal tantalate, doped with at least one element selected in the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, transition elements and lanthanides.
Inventors
- 👤 Romano Morlotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:52
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7743; C09K11/7744; C09K11/7746; C09K11/7766; C09K11/7767; C09K11/7768; C09K11/7769; G21K2004/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
142 words
A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible or infrared radiation stimulable phosphor to absorb a high energy radiation which has passed through an object, (ii) stimulating said phosphor with visible or infrared radiation to release energy stored as fluorescent light, and (iii) detecting said fluorescent light with light detecting means, characterized in that said phosphor is a green emitting terbium activated alkali metal tantalate, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb, and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi transition elements and lanthanides, and x, y and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1, and 0<z≦0.1.
Claim 2
Independent Claim
142 words
A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible or infrared radiation stimulable phosphor to absorb a high energy radiation which has passed through an object, (ii) stimulating said phosphor with visible or infrared radiation to release energy stored as fluorescent light, and (iii) detecting said fluorescent light with light detecting means, characterized in that said phosphor is a green emitting terbium activated alkali metal tantalate, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb, and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi transition elements and lanthanides, and x, y and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1, and 0<z≦0.1.
Claim 3
Dependent Claim
83 words
The method for recording and reproducing a radiation image of claim 1, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected in the group consisting of Na, K, Rb and Ce; Me is at least one metal selected in the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, Zr, W, Zn, Sm, Eu, and Gd, and x, y and z are number satisfying the conditions 0≦x<1, 0≦y<0.05 and 0<z≦0.01.
Claim 4
Dependent Claim
32 words
The method for recording and reproducing a radiation image of claim 1, wherein said phosphor is stimulated with a radiation having a wavelength in the range of from 400 to 1100 nm.
Claim 5
Dependent Claim
32 words
The method for recording and reproducing a radiation image of claim 1, wherein said phosphor is stimulated with a radiation having a wavelength in the range of from 400 to 500 nm.
Claim 6
Dependent Claim
32 words
The method for recording and reproducing a radiation image of claim 1, wherein said phosphor is stimulated with a radiation having a wavelength in the range of from 600 to 800 nm.
Claim 7
Dependent Claim
26 words
The method for recording and reproducing a radiation image of claim 1, wherein said phosphor emits a fluorescent light having a wavelength higher than 500 nm.
Claim 8
Dependent Claim
28 words
The method for recording and reproducing a radiation image of claim 1, wherein said phosphor emits a fluorescent light having a wavelength of from 500 to 600 nm.
Claim 9
Dependent Claim
102 words
A radiation image storage panel having a fluorescent layer comprising a binder and a stimulable phosphor dispersed in said binder characterized in that said phosphor is a green emitting terbium activated alkali metal tantalate, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, transition elements and lanthanides, and x, y, and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1 and 0<z≦0.1
Claim 10
Dependent Claim
102 words
A radiation image storage panel having a fluorescent layer comprising a binder and a stimulable phosphor dispersed in said binder characterized in that said phosphor is a green emitting terbium activated alkali metal tantalate, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, transition elements and lanthanides, and x, y, and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1 and 0<z≦0.1
Claim 11
Dependent Claim
79 words
The radiation image storage panel of claim 8, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected in the group consisting of Na, K, Rb and Ce; Me is at least one metal selected in the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, Zr, W, Zn, Sim, Eu, and Gd, and x, y and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.05 and 0<z≦0.01.
Claim 12
Dependent Claim
78 words
A photostimulable green emitting terbium activated alkali metal tantalate phosphor, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, transition elements and lanthanides, and x, y, and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1 and 0<z≦0.1.
Claim 13
Dependent Claim
78 words
A photostimulable green emitting terbium activated alkali metal tantalate phosphor, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, transition elements and lanthanides, and x, y, and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1 and 0<z≦0.1.
Claim 14
Dependent Claim
77 words
The photostimulable phosphor of claim 10, wherein said phosphor is represented by the following general formula Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected in the group consisting of Na, K, Rb and Ce; Me is at least one metal selected in the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi, Zr, W, Zn, Sm, Eu, and Gd, and x, y and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.05 and 0<z≦0.01.
Claim 15
Dependent Claim
20 words
The photostimulable phosphor of claim 11, wherein said phosphor emits a fluorescent light having a wavelength higher than 500 nm.
Claim 16
Dependent Claim
22 words
The photostimulable phosphor of claim 10, wherein said phosphor emits a fluorescent light having a wavelength of from 500 to 600 nm.
Claim 17
Independent Claim
145 words
An apparatus for recording and reproducing a radiation image comprising (1) means for causing a visible or infrared radiation-stimulable phosphor contained therein to absorb high energy radiation which has passed through an object, (ii) means for stimulating said phosphor with visible or infrared radiation to release the energy stored as fluorescent light, and (iii) means for detecting said fluorescent light, said apparatus being characterized in that said phosphor is a green emitting terbium activated alkali metal tantalate, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb, and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi transition elements and lanthanides, and x, y and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1, and 0<z≦0.1.
Claim 18
Independent Claim
145 words
An apparatus for recording and reproducing a radiation image comprising (1) means for causing a visible or infrared radiation-stimulable phosphor contained therein to absorb high energy radiation which has passed through an object, (ii) means for stimulating said phosphor with visible or infrared radiation to release the energy stored as fluorescent light, and (iii) means for detecting said fluorescent light, said apparatus being characterized in that said phosphor is a green emitting terbium activated alkali metal tantalate, wherein said phosphor is represented by the following general formula: Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected from the group consisting of Na, K, Rb, and Ce; Me is at least one metal selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ga, Ge, Pb, Bi transition elements and lanthanides, and x, y and z are numbers satisfying the conditions 0≦x<1, 0≦y<0.1, and 0<z≦0.1.
Claim 19
Dependent Claim
83 words
The apparatus for recording and reproducing a radiation image of claim 14, wherein said phosphor is represented by the following general formula Li.sub.1-x A.sub.x TaO.sub.3.yMe:zTb wherein A is an element selected in the group consisting of Na, K, Rb and Ce; Me is at least one metal selected in the group consisting of Mg, Ca Sr, Ba, Al, Ga, Ge, Pb, Bi, Zr, W, Zn, Sm, Eu, and Gd, and x, y and z are numbers satisfying the condition 0≦x<1, 0≦y<0.05 and 0<z≦0.01.
Claim 20
Dependent Claim
31 words
The apparatus for recording and reproducing a radiation image of claim 14, wherein said phosphor is stimulated with a radiation having a wavelength in the range of 400 to 1100 nm.
Claim 21
Dependent Claim
26 words
The apparatus for recording and reproducing a radiation image of claim 14, wherein said phosphor emits a fluorescent light having a wavelength higher than 500 nm.
Claim 22
Dependent Claim
28 words
The apparatus for recording and reproducing a radiation image of claim 14, wherein said phosphor emits a fluorescent light having a wavelength of from 500 to 600 nm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
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