US5237998A
Expired / Lapsed
US
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Method of correlating the three-dimensional images of human organs and device for implementation of the method
Assignee: DURET INVENTEUR
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Filing: 1989-11-17
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Granted: 1993-08-24
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Expires: 2009-11-17
Abstract
Abstract The three-dimensional correlation of images of a human organ, especially dental arcades, uses an impression in the occlusive position, providing a reference in the form of three mutually spaced reference points. Three-dimensional views are taken of the impression and the points and views are also taken with the impression removed. Using the images of the reference points as a basis, the sets of views are then correlated to bring them into a single referential system.
Inventors
- 👤 Francois Duret
- 👤 Jean-Louis Blouin
- 👤 Gilles Dechellete
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:21
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/004; A61C9/0046; A61C9/0053; A61C19/00; A61C19/04; G; G16; G16H; G16H20/00; G16H20/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
A method for correlating three-dimensional images of human organs able to move from an open condition to an occlusive condition, comprising the steps of: (a) producing an impression in the occlusive condition of a first organ and a second organ, by using a paste capable of being impressed by occlusing of said first and said second organs; (b) placing said impression on said first organ whereby hollow parts are formed in said impression by occlusion of said second organ thereagainst; (c) locating in a fixed and visible condition in a region of said first organ a set of three mutually spaced apart reference points; (d) taking first three-dimensional views of the hollow parts of the impression corresponding to the negative of said second organ with images of said three reference points visible on said first views; (e) removing said impression from said first organ; (f) taking second three-dimensional views of said first organ with said three reference points visible on said second views; and (g) carrying out a calculation of correlation of said first views and said second views to bring them into a single referential system defined by said three reference points.
Claim 2
Independent Claim
193 words
A method for correlating three-dimensional images of human organs able to move from an open condition to an occlusive condition, comprising the steps of: (a) producing an impression in the occlusive condition of a first organ and a second organ, by using a paste capable of being impressed by occlusing of said first and said second organs; (b) placing said impression on said first organ whereby hollow parts are formed in said impression by occlusion of said second organ thereagainst; (c) locating in a fixed and visible condition in a region of said first organ a set of three mutually spaced apart reference points; (d) taking first three-dimensional views of the hollow parts of the impression corresponding to the negative of said second organ with images of said three reference points visible on said first views; (e) removing said impression from said first organ; (f) taking second three-dimensional views of said first organ with said three reference points visible on said second views; and (g) carrying out a calculation of correlation of said first views and said second views to bring them into a single referential system defined by said three reference points.
Claim 3
Dependent Claim
80 words
The method of claim 1 wherein each reference point is supported by a surface, said surface bearing a contrast frame with a border or a contour, comprising further the steps of: evaluating a position and a distance of an analysis camera relative to a reference point, taking into account an area of a corresponding surface and a contour of a corresponding frame as viewed by said analysis camera; and determining a center of the reference point by progressive skeletonization operation.
Claim 4
Dependent Claim
35 words
The method of claim 2 wherein a surface associated with a reference point is at least partially spherical, the center of said at least partially spherical surface being a respective one of said reference points.
Claim 5
Dependent Claim
26 words
The method of claim 2 wherein a shape of said surface is of such a simple geometry that a characteristic point thereof is obtained by calculation.
Claim 6
Dependent Claim
42 words
The method of claim 2 wherein each surface associated with a reference point has a different shape, comprising the steps of: recognizing a shape of each said surface; determining each individual reference point; and automatically numbering each point in a given direction.
Claim 7
Dependent Claim
29 words
The method of claim 1 wherein said set of three reference points comprises a first arm bearing two reference points and a second arm bearing a third reference point.
Claim 8
Dependent Claim
38 words
The method of claim 1, further comprising the steps of: comparing apparent densities of points of each view with a predetermined value; and omitting from the three-dimensional images zones corresponding to apparent densities lower than said predetermined value.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the set of three reference points is affixed on an outer periphery of said first organ.
Claim 10
Dependent Claim
36 words
The method of claim 1 wherein the three-dimensional images of human organs are viewed by an analysis camera movable relatively to said human organs, an output of said analysis camera being directly fed into a computer.
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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 |