US4618928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data processing apparatus for producing X-ray images with improved signal to noise ratio
Assignee: Toshiba Corp
•
Filing: 1983-12-05
•
Granted: 1986-10-21
•
Expires: 2003-12-05
Abstract
Abstract An X-ray image data of a patient into which an X-ray contrast medium is being administered is processed in an X-ray image data processing apparatus so as to obtain the X-ray image data having an improved S/N ratio. The processing apparatus mainly comprises a linear differential filter that is composed of a plurality of multipliers and an adder. The X-ray image data is multiplied by a plurality of differential coefficients, and thereafter the results of these multiplications are summed.
Inventors
- 👤 Michitaka Honda
- 👤 Katsuya Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:38
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/30; H04N5/32; H04N5/3205
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
An apparatus for generating a processed video signal representative of an image of an object over a series of successive observation times, comprising: a source of radiation directable at said object; means for converting radiation passing through said object into an electric video signal having successive frames; means for storing a series of said successive frames of said video signal; means for multiplying, for each observation time, each of said successive stored frames by a differential filter coefficient, with the value of said coefficient for each frame being a function of the relationship between the time that frame occurred and said observation times; and means for combining said multiplied frames, for each observation time, to produce said processed video signal.
Claim 2
Independent Claim
120 words
An apparatus for generating a processed video signal representative of an image of an object over a series of successive observation times, comprising: a source of radiation directable at said object; means for converting radiation passing through said object into an electric video signal having successive frames; means for storing a series of said successive frames of said video signal; means for multiplying, for each observation time, each of said successive stored frames by a differential filter coefficient, with the value of said coefficient for each frame being a function of the relationship between the time that frame occurred and said observation times; and means for combining said multiplied frames, for each observation time, to produce said processed video signal.
Claim 3
Dependent Claim
42 words
An apparatus of claim 1 wherein said processed video signal is represented by f'(nT+T/2) where: ##EQU12## and: nT+T/2=one of said observation times; A=a gain coefficient of said apparatus; -N=the earliest frame sampled for a given observation time; and CK=a differential filter coefficient.
Claim 4
Dependent Claim
8 words
An apparatus of claim 2 wherein: CK=(-1).sup.K-1 /(K-1/2).sup.2.
Claim 5
Dependent Claim
7 words
An apparatus of claim 2 wherein: ##EQU13##
References Cited (Backward Citations)
GB2020945A
Cited
US4281347A
Cited
US4350998A
Cited
US4394684A
Cited
US4334244A
Cited
US4396903A
Cited
US4388646A
Cited
US4395732A
Cited
US4507681A
Cited
US4456926A
Cited
US4513440A
Cited
US4472733A
Cited
US4463375A
Cited
US4542459A
Cited
US4553042A
Cited
US4561022A
Cited
US4571635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |