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US5229618A
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Radiation image read-out apparatus compensating for image distortion
Assignee: Fujifilm Holdings Corp
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Filing: 1991-10-18
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Granted: 1993-07-20
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Expires: 2011-10-18
Abstract
Abstract A radiation image read-out apparatus comprises a read-out section for photoelectrically reading out a radiation image from silver halide film, on which the radiation image has been recorded, and thereby generating an image signal representing the radiation image. A signal conversion device converts the image signal such that distortion in the image signal, which distortion is caused to occur by nonlinear characteristics of the silver halide film, may be eliminated. A corrected image signal is thereby obtained, which can be processed commonly with an image signal obtained by reading out a radiation image from a stimulable phosphor sheet, on which the radiation image has been stored.
Inventors
- 👤 Nobuyoshi Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:49
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/407; H04N1/4072; G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/5907; G01N21/5911; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/2012; G01T1/2014; G01N2021/5915; G01N2021/5949; G01N2021/5957
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A radiation image read-out apparatus comprising: i) a read-out section for photoelectrically reading out a radiation image from silver halide film, on which said radiation image has been recorded, and thereby generating an image signal representing said radiation image, and ii) a signal conversion means for converting said image signal such that distortion in said image signal, which distortion is caused to occur by nonlinear characteristics of said silver halide film, is eliminated, and thereby generating a corrected image signal.
Claim 2
Dependent Claim
80 words
A radiation image read-out apparatus comprising: i) a read-out section for photoelectrically reading out a radiation image from silver halide film, on which said radiation image has been recorded, and thereby generating an image signal representing said radiation image, and ii) a signal conversion means for converting said image signal such that distortion in said image signal, which distortion is caused to occur by nonlinear characteristics of said silver halide film, is eliminated, and thereby generating a corrected image signal.
Claim 3
Dependent Claim
79 words
An apparatus as defined in claim 1, wherein said read-out section is provided with a film digitizer, which is constituted of a light source for linearly irradiating light to said silver halide film having said radiation image recorded and developed thereon, and a line sensor located facing said light source with said silver halide film intervening therebetween, said line sensor detecting the light, which has been produced by said light source and has passed through said silver halide film.
Claim 4
Dependent Claim
15 words
An apparatus as defined in claim 1, wherein said silver halide film is x-ray film.
Claim 5
Dependent Claim
49 words
An apparatus as claimed in claim 1, wherein the converted image signal is compensated by said signal conversion means to make up for the fact that the amount of energy which has been recorded on said film is not linearly proportional to the image density of said radiation image.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |