US4447827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
X-Ray diagnostic installation
Assignee: Siemens AG
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Filing: 1982-05-17
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Granted: 1984-05-08
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Expires: 2002-05-17
Abstract
Abstract An exemplary embodiment has the purpose of representation of margins of organs, and comprises a television pickup system, a first image memory, a difference stage for providing subtraction images through difference formation from the stored and the current video signal, and a monitor. Connected with the output of the difference stage is an adder which is connected with a second image memory whose output signal is supplied to the adder so that, in the second image memory, the image point data of the difference stage is summed up. The output signal of the second image memory is supplied to the monitor. The circuit disposed between the first image memory and the adder is so designed that it forms the absolute values (|A|) of the image point data from the difference stage.
Inventors
- 👤 Mircea Alexandrescu
- 👤 Joerg Haendle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:07
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H04N5/3205
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
An X-ray diagnostic installation comprising a television pickup system, a first image memory, a difference stage for providing subtraction images through difference formation from the stored and the current video signals, and a monitor, wherein an adder is connected with the output of the difference stage, and a second image memory is connected with the output of the adder so that, in the second image memory, the image point data from the difference stage is summed up, and wherein the output signal of the second image memory is supplied to the monitor, characterized in that circuit means comprising said difference stage, and disposed between the first image memory and the adder, is so designed that it forms the absolute values |A| of the image point data from the difference stage.
Claim 2
Dependent Claim
130 words
An X-ray diagnostic installation comprising a television pickup system, a first image memory, a difference stage for providing subtraction images through difference formation from the stored and the current video signals, and a monitor, wherein an adder is connected with the output of the difference stage, and a second image memory is connected with the output of the adder so that, in the second image memory, the image point data from the difference stage is summed up, and wherein the output signal of the second image memory is supplied to the monitor, characterized in that circuit means comprising said difference stage, and disposed between the first image memory and the adder, is so designed that it forms the absolute values |A| of the image point data from the difference stage.
Claim 3
Dependent Claim
69 words
Method for producing subtraction images characterized by the steps of forming the difference between a current and a stored video signal to supply a differential signal, forming the absolute values of the image point information of a plurality of differential signals, summing the absolute values of corresponding image point information of respective differential signals, and displaying an image of the image point information formed by the summed absolute values.
Claim 4
Dependent Claim
69 words
Method for producing subtraction images characterized by the steps of forming the difference between a current and a stored video signal to supply a differential signal, forming the absolute values of the image point information of a plurality of differential signals, summing the absolute values of corresponding image point information of respective differential signals, and displaying an image of the image point information formed by the summed absolute values.
Claim 5
Dependent Claim
57 words
Method according to claim 2, wherein successive differential signals are formed representing subtraction images of an organ whose position cyclically varies as a function of time, and summing absolute values of image point information for successive different phases of the movement of the organ to produce a displayed image showing the range of movement of the organ.
References Cited (Backward Citations)
US4398213A
Cited
US4367490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |