US5239567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-ray imaging system
Assignee: US Philips Corp
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Filing: 1991-11-27
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Granted: 1993-08-24
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Expires: 2011-11-27
Abstract
Abstract The invention relates to an X-ray imaging system, comprising an X-ray source for emitting an X-ray beam, a power supply unit which is connected to the X-ray source, an X-ray detector for converting the X-ray beam into an optical image, a television pick-up device for converting the optical image into a video signal, a detection device which is connected to the television pick-up device and which serves to form a control signal from the video signal, an output of the detection device being connected to the power supply unit for adjustment thereof, and a display unit which is connected to the output of the television pick-up device via an amplifier (18). When the reciprocal of the signal generated by the detection device is used as the gain factor for the amplifier, a stable brightness is obtained on the television monitor without giving rise to a light flash when the X-ray source is switched on. As a result, the duration of exposure can be reduced during medical imaging so that the dose applied is less and motional unsharpness is reduced.
Inventors
- 👤 Antonie R. M. Loonen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:05
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H05; H05G; H05G1/00; H05G1/08; H05G1/64
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
178 words
An X-ray imaging system comprising: an X-ray source for emitting an X-ray beam; a power supply means having an output connected to the X-ray source for controlling a dose produced by said X-ray beam, the output of said power supply means being adjustable in response to a first control signal; X-ray detector means for converting the X-ray radiation from said beam into an optical image; television pick-up means for converting the optical image into a video signal; amplifier means fed by pickup means for amplifying said video signal in accordance with a gain factor which is proportionate to a second control signal; display means for displaying said video signal as amplified by said amplifier means; control signal deriving means for deriving said first and second control signals from said video signal in a manner that said first signal is proportionate to a value of said video signal and said second signal is inversely proportionate to a value of said video signal; and means for conveying said video signal from said pickup means to said control signal deriving means.
Claim 2
Dependent Claim
178 words
An X-ray imaging system comprising: an X-ray source for emitting an X-ray beam; a power supply means having an output connected to the X-ray source for controlling a dose produced by said X-ray beam, the output of said power supply means being adjustable in response to a first control signal; X-ray detector means for converting the X-ray radiation from said beam into an optical image; television pick-up means for converting the optical image into a video signal; amplifier means fed by pickup means for amplifying said video signal in accordance with a gain factor which is proportionate to a second control signal; display means for displaying said video signal as amplified by said amplifier means; control signal deriving means for deriving said first and second control signals from said video signal in a manner that said first signal is proportionate to a value of said video signal and said second signal is inversely proportionate to a value of said video signal; and means for conveying said video signal from said pickup means to said control signal deriving means.
Claim 3
Dependent Claim
24 words
An X-ray imaging system as claimed in claim 1, wherein each value of said video signal is a mean value or a peak value.
Claim 4
Dependent Claim
35 words
An X-ray imaging system as claimed in claim 1, wherein said reference value is variable and said video signal conveying means comprises a further amplifier means having a gain factor proportionate to said reference value.
Claim 5
Dependent Claim
29 words
An X-ray imaging system as claimed in claim 3, wherein each of said first and second values of said video signal is a mean value or a peak value.
Claim 6
Dependent Claim
71 words
An X-ray imaging system as claimed in claim 1, wherein said control signal deriving means comprises first means for deriving said first control signal from a first value of said video signal and second means for deriving a third signal from a second value of said video signal different from said first value, and dividing means for deriving said second control signal by dividing a reference value by said third signal.
Claim 7
Dependent Claim
29 words
An X-ray imaging system as claimed in claim 5, wherein each of said first and second values of said video signal is a mean value or a peak value.
Claim 8
Dependent Claim
35 words
An X-ray imaging system as claimed in claim 5, wherein said reference value is variable and said video signal conveying means comprises a further amplifier means having a gain factor proportionate to said reference value.
Claim 9
Dependent Claim
24 words
An X-ray imaging system as claimed in claim 7, wherein each value of said video signal is a mean value or a peak value.
Claim 10
Dependent Claim
166 words
An X-ray imaging system comprising: an X-ray source for emitting an X-ray beam; a power supply means having an output connected to the X-ray source for controlling a dose produced by said X-ray beam, the output of said power supply means being adjustable in response to a first control signal; X-ray detector means for converting the X-ray radiation from said beam into an optical image; television pick-up means for converting the optical image into a video signal; amplifier means fed by pickup means for amplifying said video signal in accordance with a gain factor which is proportionate to a second control signal; display means for displaying said video signal as amplified by said amplifier means; control signal deriving means for deriving said first and second control signals from said video signal in a manner that said second control signal is proportional to the reciprocal of said first control signal; and means for conveying said video signal from said pickup means to said control signal deriving means.
Claim 11
Dependent Claim
166 words
An X-ray imaging system comprising: an X-ray source for emitting an X-ray beam; a power supply means having an output connected to the X-ray source for controlling a dose produced by said X-ray beam, the output of said power supply means being adjustable in response to a first control signal; X-ray detector means for converting the X-ray radiation from said beam into an optical image; television pick-up means for converting the optical image into a video signal; amplifier means fed by pickup means for amplifying said video signal in accordance with a gain factor which is proportionate to a second control signal; display means for displaying said video signal as amplified by said amplifier means; control signal deriving means for deriving said first and second control signals from said video signal in a manner that said second control signal is proportional to the reciprocal of said first control signal; and means for conveying said video signal from said pickup means to said control signal deriving means.
Claim 12
Dependent Claim
35 words
An X-ray imaging system as claimed in claim 9, wherein said second control signal deriving means comprises divider means for deriving said second control signal by dividing a reference value by said first control signal.
Claim 13
Dependent Claim
24 words
An X-ray imaging system as claimed in claim 10, wherein said value of said video signal is a mean value or a peak value.
Claim 14
Dependent Claim
35 words
An X-ray imaging system as claimed in claim 10, wherein said reference value is variable and said video signal conveying means comprises a further amplifier means having a gain factor proportionate to said reference value.
Claim 15
Dependent Claim
45 words
An X-ray imaging system as claimed in claim 9, wherein said control signal deriving means comprises first means for deriving said first control signal from a value of said video signal and second means for deriving said second control signal from said first control signal.
Claim 16
Dependent Claim
24 words
An X-ray imaging system as claimed in claim 13, wherein said value of said video signal is a mean value or a peak value.
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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |