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EP0321804A1
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Method for recording and reproducing a radiation image, apparatus using said method, panel for storing a radiation image and photostimulable phosphors
Assignee: 3M Co
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Filing: 1988-12-09
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Granted: —
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Expires: 2008-12-09
Abstract
Abstract A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) stimulating said phosphor with visible radiation to release the stored energy as fluorescent light and (iii) detecting said fluorescent light with light detecting means, is characterized by the fact that the photostimulable phosphor is selected within the group of divalent europium activated alkali earth metal halosilicates. Apparatus for recording and reproducing a radiation image using the above described method. Panel for storing a radiation image containing the above described photostimulable phosphors. Phosphors selected within the group of alkali earth metal halosilicates activated with divalent europium in the presence of Al and/or Ga and/or Na and/or K.
Inventors
- 👤 Claude Fouassier
- 👤 R. Morlotti
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 03:25
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/77342
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
74 words
A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) stimulating said phosphor with visible radiation to release the stored energy as fluorescent light and (iii) detecting said fluorescent light with light detecting means, characterized by the fact that said phosphor is selected within the group of divalent europium activated alkali earth metal halosilicates.
Claim 2
Independent Claim
74 words
A method for recording and reproducing a radiation image comprising the steps of (i) causing a visible radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) stimulating said phosphor with visible radiation to release the stored energy as fluorescent light and (iii) detecting said fluorescent light with light detecting means, characterized by the fact that said phosphor is selected within the group of divalent europium activated alkali earth metal halosilicates.
Claim 3
Dependent Claim
59 words
The method for recording and reproducing a radiation image as defined in claim 1 wherein said phosphor is represented by the formula: Me²⁺₅·SiO₄X₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl or Br; 0<a≦0.1; 0≦m≦0.1 and 0≦n≦0.1.
Claim 4
Dependent Claim
33 words
The method for recording and reproducing a radiation image as defined in claim 1, where said phosphor is stimulated by a radiation having a wavelength in the range from 480 to 700 nm.
Claim 5
Dependent Claim
33 words
The method for recording and reproducing a radiation image as defined in claim 3, where said phosphor is stimulated by a radiation having a wavelength in the range from 500 to 600 nm.
Claim 6
Dependent Claim
33 words
The method for recording and reproducing a radiation image as defined in claim 3, where said phosphor is stimulated by a radiation having a wavelength in the range from 500 to 550 nm.
Claim 7
Dependent Claim
41 words
The method for recording and reproducing a radiation image as defined in claim 1, where said fluorescent light detecting means comprise filters absorbing radiation having a wavelength higher than 480 nm and detect radiation having a wavelength lower than 480 nm.
Claim 8
Dependent Claim
78 words
An improved apparatus for recording and reproducing a radiation image comprising (1) means for causing a visible radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) means for stimulating said phosphor with visible radiation to release the stored energy as fluorescent light and (iii) means for detecting said fluorescent light, said apparatus being characterized by the fact that said phosphor is selected within the group of divalent europium activated substituted alkali earth metal halosilicates.
Claim 9
Dependent Claim
78 words
An improved apparatus for recording and reproducing a radiation image comprising (1) means for causing a visible radiation stimulable phosphor to absorb a high-energy radiation passing through an object, (ii) means for stimulating said phosphor with visible radiation to release the stored energy as fluorescent light and (iii) means for detecting said fluorescent light, said apparatus being characterized by the fact that said phosphor is selected within the group of divalent europium activated substituted alkali earth metal halosilicates.
Claim 10
Dependent Claim
60 words
The apparatus for recording and reproducing a radiation image as defined in claim 7 wherein said phosphor is represented by the formula: Me²⁺₅·SiO₄X₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one selected among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl and Br; 0<a≦0.1; 0≦m≦0.1 and 0≦n≦0.1.
Claim 11
Dependent Claim
33 words
The apparatus for recording and reproducing a radiation image as defined in claim 7, wherein said phosphor is stimulated by a radiation having a wavelength in the range from 480 to 700 nm.
Claim 12
Dependent Claim
39 words
A radiation image storing panel having a fluorescent layer comprising a binder and a stimulable phosphor dispersed therein, characterized by the fact that said phosphor is selected within the group of divalent europium activated substituted alkali earth metal halosilicates.
Claim 13
Dependent Claim
39 words
A radiation image storing panel having a fluorescent layer comprising a binder and a stimulable phosphor dispersed therein, characterized by the fact that said phosphor is selected within the group of divalent europium activated substituted alkali earth metal halosilicates.
Claim 14
Dependent Claim
56 words
The radiation image storing panel as defined in claim 10 wherein said phosphor is represented by the formula: Me²⁺₅ ·SiO₄X₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl or Br; 0<a≦0.1; 0≦m≦0.1 and 0≦n≦0.1.
Claim 15
Dependent Claim
44 words
A photostimulable phosphor represented by the formula: Me²⁺₅·SiO₄x₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl or Br; 0<a≦0.1; 0≦m≦0.1 and 0<n≦0.1.
Claim 16
Dependent Claim
44 words
A photostimulable phosphor represented by the formula: Me²⁺₅·SiO₄x₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl or Br; 0<a≦0.1; 0≦m≦0.1 and 0<n≦0.1.
Claim 17
Dependent Claim
44 words
A photostimulable phosphor represented by the formula: Me²⁺₅·SiO₄x₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl or Br; 0<a≦0.1; 0<m≦0.1 and 0≦n≦0.1.
Claim 18
Dependent Claim
44 words
A photostimulable phosphor represented by the formula: Me²⁺₅·SiO₄x₆·mMe¹⁺·nMe³⁺ : aEu²⁺ wherein Me²⁺ is at least one among Sr, Ca and Ba; Me¹⁺ is Na or K; Me³⁺ is Al or Ga; X is at least one of Cl or Br; 0<a≦0.1; 0<m≦0.1 and 0≦n≦0.1.
References Cited (Backward Citations)
EP0007838A2
Cited
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