US3745245A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution system for t.v. monitoring of intermittant x-ray signals
Assignee: HITACHI ROENTGEN
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Filing: 1971-06-15
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Granted: 1973-07-10
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Expires: 1991-06-15
Abstract
Abstract A high resolution system to supplement intermittent image fields in X-ray television monitoring for diagnosis, in which X-rays are radiated intermittently for every one or several frames of television signals, a field of video signals obtained in each Xray radiation is recorded, and a signal thus recorded is repeatedly reproduced to obtain, through a delay circuit, two pieces of the video signal with a phase difference of one half of a horizontal scanning period, so that, by combining these two pieces of the video signal and displaying them as a frame of images, an image of high resolution can be observed even during the periods of interruption of X-ray radiation.
Inventors
- 👤 S Kashiwagi
- 👤 K Koike
- 👤 Y Yunde
- 👤 S Yanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:54
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/18; H04N5/00; H04N5/30; H04N5/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
254 words
A system for displaying a television picture from intermittent X-ray images obtained from intermittent X-ray radiations, said system comprising: first means for projecting intermittent X-ray radiations onto a subject at a predetermined frequency to produce intermittent Xray images; second means for scanning each of said intermittent X-ray images thereby producing a video signal of each X-ray image corresponding to one field of a television picture to be displayed; third means for storing a viDeo signal including a recording medium and means for erasing a previously recorded signal on said recording medium and recording said video signal produced by said second means on said recording medium; fourth means for reading out said video signal recorded on said third means repeatingly at a frequency corresponding to the field frequency of said television picture, thereby producing a train of identical video signals each being the same as said video signal produced by said second means; fifth means for delaying every other one of said video signals produced by said fourth means by a predetermined time and producing a train of delayed and non-delayed alternately occurring video signals; and sixth means for receiving said video signal produced by said second means and said delayed and non-delayed video signals produced by said fifth means and applying every adjacent two of said received video signals, one of which is non-delayed and the other is delayed, to a monitor, sequentially, thereby displaying on said monitor a television picture, said every adjacent two video signals covering a frame of said television picture.
Claim 2
Independent Claim
254 words
A system for displaying a television picture from intermittent X-ray images obtained from intermittent X-ray radiations, said system comprising: first means for projecting intermittent X-ray radiations onto a subject at a predetermined frequency to produce intermittent Xray images; second means for scanning each of said intermittent X-ray images thereby producing a video signal of each X-ray image corresponding to one field of a television picture to be displayed; third means for storing a viDeo signal including a recording medium and means for erasing a previously recorded signal on said recording medium and recording said video signal produced by said second means on said recording medium; fourth means for reading out said video signal recorded on said third means repeatingly at a frequency corresponding to the field frequency of said television picture, thereby producing a train of identical video signals each being the same as said video signal produced by said second means; fifth means for delaying every other one of said video signals produced by said fourth means by a predetermined time and producing a train of delayed and non-delayed alternately occurring video signals; and sixth means for receiving said video signal produced by said second means and said delayed and non-delayed video signals produced by said fifth means and applying every adjacent two of said received video signals, one of which is non-delayed and the other is delayed, to a monitor, sequentially, thereby displaying on said monitor a television picture, said every adjacent two video signals covering a frame of said television picture.
Claim 3
Dependent Claim
41 words
A system according to claim 1, wherein said fifth means comprises means for delaying every other one of said video signals produced by said fourth means by one half of a period for scanning one horizontal line of said television picture.
Claim 4
Dependent Claim
70 words
A system according to claim 2, further comprising means for interrupting said intermittent X-ray radiations of said first means and for causing said fourth means to produce a train of identical video signals each being the same as the one produced by scanning the X-ray image produced by said first means just before the interruption of said X-ray radiations, thereby displacing a still television picture of said last-mentioned X-ray image.
Claim 5
Dependent Claim
29 words
A system according to claim 3, wherein said intermittent X-ray radiations are projected each during one of the blanking periods in a television signal for displaying the television picture.
Claim 6
Dependent Claim
70 words
A system according to claim 1, further comprising means for interrupting said intermittent X-ray radiations of said first means and for causing said fourth means to produce a train of identical video signals each being the same as the one produced by scanning the X-ray image produced by said first means just before the interruption of said X-ray radiations, thereby displaying a still television picture of said last-mentioned X-ray image.
Claim 7
Dependent Claim
39 words
A system according to claim 1, wherein said third means comprises a magnetic disc serving as the recording medium, and driving means for rotating said magnetic disc at a speed corresponding to the field frequency of said television picture.
Claim 8
Dependent Claim
29 words
A system according to claim 1, wherein said intermittent X-ray radiations are projected each during one of the blanking periods in a television signal for displaying the television picture.
Claim 9
Dependent Claim
72 words
A system according to claim 1, further comprising means for controlling the operation of said fourth and sixth means including a pulse generator circuit, responsive to the video signal produced by said second means and a preselected frequency signal for generating a first control pulse and a gate signal generator, responsive to said first control pulse and to the contents of said video signal for selectively gating said fourth and sixth means.
Claim 10
Dependent Claim
64 words
A system according to claim 8, further including a field discriminator means, responsive to the video signal output of said second means, for generating a rectangular signal the respective levels of which correspond to the alternate fields making up said video signal, the output of said field discriminator means being connected to said pulse generator circuit, said gate signal generator, and said fifth means.
Claim 11
Dependent Claim
41 words
A system according to claim 9, further including switch means, connected between said pulse generator circuit, said gate signal generator and said first means, for switchably effecting the observation of a still imaGe instantaneously during the production of television X-ray pictures.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |