US4521904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and cassette for taking X-ray photograph
Assignee: Fujifilm Holdings Corp
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Filing: 1982-09-29
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Granted: 1985-06-04
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Expires: 2002-09-29
Abstract
Abstract A method of taking an X-ray photograph by using a cassette containing an X-ray film and a stimulable phosphor sheet maintained in close contact with each other in a light shielding case. When the cassette is exposed to X-rays through an object, an X-ray transmission image of the object is recorded on the stimulable phosphor sheet and, at the same time, the X-ray film is exposed to light instantaneously emitted from the stimulable phosphor sheet upon exposure to X-rays to record a photographic latent image of the X-ray transmission image of the object on the X-ray film. The X-ray film may be provided with an emulsion layer only on the side facing the stimulable phosphor sheet, or may be provided with emulsion layers on both sides. In the latter case, an intensifying screen may be positioned on the side of the X-ray film opposite to the stimulable phosphor sheet.
Inventors
- 👤 Masao Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16; G03C5/17; G03B; G03B42/00; G03B42/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
172 words
A method of taking an X-ray photograph, which comprises maintaining an X-ray film and a stimulable phosphor sheet in close contact with each other and shielded from light, and exposing said X-ray film and said stimulable phosphor sheet to X-rays through an object, whereby an X-ray transmission image of said object is recorded on said stimulable phosphor sheet and, at the same time, said X-ray film is exposed to light instantaneously emitted from stimulable phosphor sheet upon exposure to X-rays to record a photographic latent image of the X-ray transmission image of said object on said X-ray film, processing the image recorded on said stimulable phosphor sheet by scanning said latter sheet with a stimulating ray source to cause said latter image to be emitted as a light image; converting said light image to an electrical signal; processing said electrical signal to obtain an image suitable for viewing; and processing the image recorded on the X-ray film by developing and fixing said latter image to obtain a further image suitable for viewing.
Claim 2
Independent Claim
172 words
A method of taking an X-ray photograph, which comprises maintaining an X-ray film and a stimulable phosphor sheet in close contact with each other and shielded from light, and exposing said X-ray film and said stimulable phosphor sheet to X-rays through an object, whereby an X-ray transmission image of said object is recorded on said stimulable phosphor sheet and, at the same time, said X-ray film is exposed to light instantaneously emitted from stimulable phosphor sheet upon exposure to X-rays to record a photographic latent image of the X-ray transmission image of said object on said X-ray film, processing the image recorded on said stimulable phosphor sheet by scanning said latter sheet with a stimulating ray source to cause said latter image to be emitted as a light image; converting said light image to an electrical signal; processing said electrical signal to obtain an image suitable for viewing; and processing the image recorded on the X-ray film by developing and fixing said latter image to obtain a further image suitable for viewing.
Claim 3
Dependent Claim
28 words
A method as defined in claim 1 wherein said stimulable phosphor sheet is provided with a layer of a stimulable rare earth activated alkaline earth metal fluorohalide phosphor.
Claim 4
Dependent Claim
29 words
A method as defined in claim 1 wherein said X-ray film is provided with a photographic emulsion layer on the side coming into contact with said stimulable phosphor sheet.
Claim 5
Dependent Claim
31 words
A method as defined in claim 3 wherein a stimulable phosphor layer of said stimulable phosphor sheet is brought into close contact with said photographic emulsion layer of said X-ray film.
Claim 6
Dependent Claim
20 words
A method as defined in claim 1 wherein said X-ray film is provided with photographic emulsion layers on both sides.
Claim 7
Dependent Claim
43 words
A method as defined in claim 1 wherein a stimulable phosphor layer of said stimulable phosphor sheet is brought into close contact with one photographic emulsion layer of said X-ray film, and an intensifying screen is positioned on the other photographic emulsion layer.
Claim 8
Dependent Claim
31 words
A method as defined in claim 6 wherein an intensifying phosphor layer of said intensifying screen is brought into close contact with said other photographic emulsion layer of said X-ray film.
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) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |