US5124564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recording and reproducing a radiation image, apparatus using said method, panel for storing a radiation image and photostimulable phosphors
Assignee: 3M Co
•
Filing: 1988-12-13
•
Granted: 1992-06-23
•
Expires: 2008-12-13
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
- 👤 Romano Morlotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:09
CPC Classifications
G; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7728; C09K11/77342
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 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 a divalent europium activated alkali earth metal halosilicate represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 2
Independent Claim
117 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 a divalent europium activated alkali earth metal halosilicate represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 3
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 4
Dependent Claim
33 words
The method for recording and reproducing a radiation image as defined in claim 2, where said phosphor is stimulated by a radiation having a wavelength in the range from 500 to 600 nm.
Claim 5
Dependent Claim
33 words
The method for recording and reproducing a radiation image as defined in claim 2, where said phosphor is stimulated by a radiation having a wavelength in the range from 500 to 550 nm.
Claim 6
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 7
Dependent Claim
121 words
An improved apparatus for recording and reproducing a radiation image comprising (i) 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 a divalent europium activated substituted alkali earth metal halosilicate represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 8
Dependent Claim
121 words
An improved apparatus for recording and reproducing a radiation image comprising (i) 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 a divalent europium activated substituted alkali earth metal halosilicate represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 9
Dependent Claim
33 words
The apparatus for recording and reproducing a radiation image as defined in claim 6, wherein said phosphor is stimulated by a radiation having a wavelength in the range from 480 to 700 nm.
Claim 10
Dependent Claim
82 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 a divalent europium activated substituted alkali earth metal halosilicate represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 11
Dependent Claim
82 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 a divalent europium activated substituted alkali earth metal halosilicate represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 12
Dependent Claim
50 words
A photostimulable phosphor represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 13
Dependent Claim
50 words
A photostimulable phosphor represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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 14
Dependent Claim
50 words
A photostimulable phosphor represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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
50 words
A photostimulable phosphor represented by the formula: Me.sup.2+.sub.5 ·SiO.sub.4 X.sub.6 ·mMe.sup.1+ ·nMe.sup.3+ :aEu.sup.2+ wherein Me 2+ is at least one among Sr, Ca and Ba; Me 1+ is Na or K; Me 3+ 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)
JPS4958556A
Cited
US3859527A
Cited
US4258264A
Cited
US4220551A
Cited
US4261854A
Cited
EP0107192A1
Cited
EP0111893A2
Cited
EP0159726A2
Cited
US4689278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |