US3869602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatic computation of cardiothoracic ratio
Assignee: Panasonic Holdings Corp
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Filing: 1972-08-29
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Granted: 1975-03-04
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Expires: 1992-08-29
Abstract
Abstract An apparatus for automatically measuring the cardiothoracic ratios speedily and with a sufficiently high accuracy, characterized in that the profiles of the thorax and heart are first inferred by processing information on brightness from an Xray image and then an error in the inference of the profiles is corrected by contextual data processing, so that the cardiothoracic ratio may be computed on the basis of the corrected data.
Inventors
- 👤 Nobuhiko Sezaki
- 👤 Kohji Ukena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:59
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/5907; G01N21/5911; A; A61; A61B; A61B5/00; A61B5/103; A61B5/107; A61B6/00; A61B6/50; A61B6/503; G06; G06T; G06T7/00; G06T7/60; G06T7/62; G06T2207/00; G06T2207/10; G06T2207/10116; G06T2207/30; G06T2207/30004; G06T2207/30048
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A system for automatically measuring the cardiothoracic ratios comprising photo-electric conversion means (820) for effectively scanning a chest X-ray image (810) along a plurality of parallel lines perpendicular to the median line of said chest X-ray image and converting the brightness of said X-ray image into a corresponding electrical signal, data processing means (830) for processing data obtained from said photo-electric conversion means, and means (840) for recording or displaying the value of the cardiothoracic ratio obtained from said data processing means, said data processing means (830) inferring intersections between the boundary lines of the thorax and the heart and said plurality of parallel lines on the basis of data obtained along each of said parallel lines, said data processing means (830) correcting erroneous data which may be contained in four series of data corresponding to the boundary lines of the thorax and the heart, whereby the cardiothoracic ratio is determined on the basis of said four series of data.
Claim 2
Independent Claim
160 words
A system for automatically measuring the cardiothoracic ratios comprising photo-electric conversion means (820) for effectively scanning a chest X-ray image (810) along a plurality of parallel lines perpendicular to the median line of said chest X-ray image and converting the brightness of said X-ray image into a corresponding electrical signal, data processing means (830) for processing data obtained from said photo-electric conversion means, and means (840) for recording or displaying the value of the cardiothoracic ratio obtained from said data processing means, said data processing means (830) inferring intersections between the boundary lines of the thorax and the heart and said plurality of parallel lines on the basis of data obtained along each of said parallel lines, said data processing means (830) correcting erroneous data which may be contained in four series of data corresponding to the boundary lines of the thorax and the heart, whereby the cardiothoracic ratio is determined on the basis of said four series of data.
Claim 3
Dependent Claim
21 words
A system for automatically measuring the cardiothoracic ratios according to claim 1, in which said film handling means is manually operated.
Claim 4
Dependent Claim
32 words
A system for automatically measuring the cardiothoracic ratios according to claim 1, in which said photo-electric conversion means comprises a standard type of television image pickup device or an equivalent film camera.
Claim 5
Dependent Claim
25 words
A system for automatically measuring the cardiothoracic ratios according to claim 1, in which said data processing means is replaced by a general-purpose digital computer.
Claim 6
Dependent Claim
44 words
A system for automatically measuring the cardiothoracic ratios according to claim 1, in which data are processed in such a maNner as to display or record the profiles of the heart and/or the thorax or the silhouettes thereof as well as the cardiothoracic ratios.
Claim 7
Dependent Claim
27 words
A system for automatically measuring the cardiothoracic ratios according to claim 1, further comprising film handling means for automatically feeding the film carrying said chest X-ray image.
References Cited (Backward Citations)
US3580997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |