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US5367176A
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Photostimulable storage phosphor and its use in radiography
Assignee: Agfa Gevaert NV
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Filing: 1993-05-17
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Granted: 1994-11-22
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Expires: 2013-05-17
Abstract
Abstract A photostimulable storage phosphor within the scope of following formula (I): M.sub.3 (PO.sub.4).sub.2 :xEu.sup.2+, yT.sup.3+, zZr.sup.4+ wherein: M is at least one of the alkaline earth metals selected from the group consisting of Ca, Sr and Ba, x corresponds with an atom fraction value 5×10 -5 ≦×≦10 -1 , y corresponds with an atom fraction value 0≦y≦10 -1 , T 3+ is at least one member selected from the group consisting of La 3+ , Lu 3+ , y 3+ and Gd 3+ , z corresponds with an atom fraction value 0≦z≦10 -1 , and 5×10 -5 ≦z+y≦10 -1 .
Inventors
- 👤 Paul Leblans
- 👤 Willem Schipper
- 👤 George Blasse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:19
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7795; C09K11/7796; C09K11/7728; C09K11/7737; C09K11/7738; G; G21; G21K; G21K4/00; G21K2004/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
163 words
A method for recording and reproducing an X-ray image which method comprises the steps of: (1) causing a photostimulable phosphor to absorb image-wise or pattern-wise modulated X-rays, (2) photostimulating said phosphor with visible light in the wavelength range of 488 to 532 nm to release from the phosphor in accordance with the absorbed X-rays electromagnetic radiation different in wavelength characteristic from the radiation used in the photo-stimulation, and (3) detecting said electromagnetic radiation emitted by photostimulation, wherein said phosphor is within the scope of the following formula (I): M.sub.3 (PO.sub.4).sub.2 :xEu.sup.2+, yT.sup.3+,zZr.sup.4+ wherein: M represents Ba and/or Sr, x corresponds with an atom fraction value 10 -4 ≦x≦10 -1 , y corresponds with an atom fraction value 10 -4 ≦y≦10 -1 , T 3+ is a member selected from the group consisting of La 3+ , Lu 3+ , y 3+ and Gd 3+ , z corresponds with an atom fraction value 10 -4 ≦z≦10 -1 , and 5×10 -5 ≦z+y≦10 -1 .
Claim 2
Independent Claim
163 words
A method for recording and reproducing an X-ray image which method comprises the steps of: (1) causing a photostimulable phosphor to absorb image-wise or pattern-wise modulated X-rays, (2) photostimulating said phosphor with visible light in the wavelength range of 488 to 532 nm to release from the phosphor in accordance with the absorbed X-rays electromagnetic radiation different in wavelength characteristic from the radiation used in the photo-stimulation, and (3) detecting said electromagnetic radiation emitted by photostimulation, wherein said phosphor is within the scope of the following formula (I): M.sub.3 (PO.sub.4).sub.2 :xEu.sup.2+, yT.sup.3+,zZr.sup.4+ wherein: M represents Ba and/or Sr, x corresponds with an atom fraction value 10 -4 ≦x≦10 -1 , y corresponds with an atom fraction value 10 -4 ≦y≦10 -1 , T 3+ is a member selected from the group consisting of La 3+ , Lu 3+ , y 3+ and Gd 3+ , z corresponds with an atom fraction value 10 -4 ≦z≦10 -1 , and 5×10 -5 ≦z+y≦10 -1 .
Claim 3
Dependent Claim
30 words
Method according to claim 1 wherein the photostimulation proceeds with 488 or 514 nm light of an argon ion laser or 532 nm light of a frequency doubled Nd:YAG laser.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 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 |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |