Patent US4058832A successfully refreshed from Google Patents.
US4058832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display for television imaging system
Assignee: Philips Nuclear Medicine Inc
•
Filing: 1976-03-05
•
Granted: 1977-11-15
•
Expires: 1996-03-05
Abstract
Abstract A radiation imaging system and method is disclosed for producing an enhanced television image of diagnostic quality from a light image produced by a common image tube and corresponding to a pattern of penetrative radiation from a subject. A source directs radiation such as X-rays through the subject and the image tube converts the emergent radiation pattern to a corresponding visible light image at an output phosphor. A television apparatus including an image isocon pickup tube views the output light image at a tube input face by way of a lens assembly and converts the light image to electrical, including video signals. A television monitor reconverts the electrical signals to a visible television image of enhanced quality representing the pattern of radiation from the subject. The television monitor includes an improved cathode ray tube with a planar output face, a small focal spot, and improved phosphor.
Inventors
- 👤 Robert J. Vagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:46
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H05; H05G; H05G1/00; H05G1/08; H05G1/64
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
In a system for producing a visible light image corresponding to a pattern of penetrative radiation emergent from a subject, the system including a source for directing penetrative radiation through the subject, means for converting the emergent penetrative radiation pattern to a visible light image, electrical apparatus for converting the visible light image to electrical signals, and a display apparatus including a cathode ray tube having an electron gun for producing an electron beam, an output face and a phosphor layer on the inner surface of the output face, the phosphor layer being disposed for impingement by the electron beam and for emitting light for producing a second visible image representing the pattern of penetrative radiation when the electron beam strikes the phosphor, the improvement comprising: a. the output face of the cathode ray tube having a substantially planar configuration; and b. the focal spot of the electron beam having a diameter of no more than about 0.0017 inches at an electron beam current of about 4 microamperes.
Claim 2
Dependent Claim
168 words
In a system for producing a visible light image corresponding to a pattern of penetrative radiation emergent from a subject, the system including a source for directing penetrative radiation through the subject, means for converting the emergent penetrative radiation pattern to a visible light image, electrical apparatus for converting the visible light image to electrical signals, and a display apparatus including a cathode ray tube having an electron gun for producing an electron beam, an output face and a phosphor layer on the inner surface of the output face, the phosphor layer being disposed for impingement by the electron beam and for emitting light for producing a second visible image representing the pattern of penetrative radiation when the electron beam strikes the phosphor, the improvement comprising: a. the output face of the cathode ray tube having a substantially planar configuration; and b. the focal spot of the electron beam having a diameter of no more than about 0.0017 inches at an electron beam current of about 4 microamperes.
Claim 3
Dependent Claim
166 words
In a system for producing a visible light image corresponding to a pattern of penetrative radiation emergent from a subject, the system including a source for directing penetrative radiation through the subject, means for converting the emergent penetrative radiation pattern to a visible light image, electrical apparatus for converting the visible light image to electrical signals, and a display apparatus including a cathode ray tube having an electron gun for producing an electron beam, an output face and a phosphor layer on the inner surface of the output face, the phosphor layer being disposed for impingement by the electron beam and for emitting light for producing a second visible image representing the pattern of penetrative radiation when the electron beam strikes the phosphor, the improvement comprising: a. the output face of the cathode ray tube having a substantially planar configuration, and b. the focal spot of the electron beam having a diameter of no more than 0.0024 inches at a beam current of approximately 25 microamperes.
Claim 4
Dependent Claim
166 words
In a system for producing a visible light image corresponding to a pattern of penetrative radiation emergent from a subject, the system including a source for directing penetrative radiation through the subject, means for converting the emergent penetrative radiation pattern to a visible light image, electrical apparatus for converting the visible light image to electrical signals, and a display apparatus including a cathode ray tube having an electron gun for producing an electron beam, an output face and a phosphor layer on the inner surface of the output face, the phosphor layer being disposed for impingement by the electron beam and for emitting light for producing a second visible image representing the pattern of penetrative radiation when the electron beam strikes the phosphor, the improvement comprising: a. the output face of the cathode ray tube having a substantially planar configuration, and b. the focal spot of the electron beam having a diameter of no more than 0.0024 inches at a beam current of approximately 25 microamperes.
References Cited (Backward Citations)
US3894181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-14 | 1981-05-16 | 1981-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-14 | 1985-05-16 | 1985-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-14 | 1989-05-16 | 1989-11-15 | $7700.00 | Window Closed / Lapsed |