Computer graphics processing and selective visual display system – Computer graphics processing – Graphic manipulation
Reexamination Certificate
2005-06-14
2005-06-14
Razavi, Michael (Department: 2672)
Computer graphics processing and selective visual display system
Computer graphics processing
Graphic manipulation
Reexamination Certificate
active
06906731
ABSTRACT:
The invention relates to a method of analyzing an object data set comprising points in a multi-dimensional space, in which dataset a tubular structure, such as blood vessels, occurs. The method comprises the following steps:a) choosing a screen position related to the tubular structure;b) determining the multi-dimensional co-ordinates of a starting position associated with said screen position;c) deriving a plane through said starting position having its normal directed to the tubular structure;d) determining a surface point of the tubular structure as a target position associated with the starting position;e) selecting a number of points forming part of the surface of the tubular structure in the vicinity of the target position;f) determining the surface point in the selection which is closest to the plane; andg) using the surface point determined in the step f) as a new starting position.This method allows accurate and reproducible selection of the starting position.The invention also relates to a computer program to carry out the method according to the invention.
REFERENCES:
patent: 2002/0136440 (2002-09-01), Yim et al.
patent: 2003/0053697 (2003-03-01), Aylward et al.
patent: WO 01/2655 (2001-04-01), None
patent: WO 01/26055 (2001-04-01), None
Bruijns, J. “Semi-Automatic Shape Extration from Tube-like Geometry”, Xootic Magazine, Jan., 2001.
Suzuki, Yasuyuki, Direct Measurement of Retinal Vessel Diameter: Comparison with Microdensitometric Methods Based on Fundus Photographs; Survey of Ophthalmology, vol. 39, Supp. 1, May 1995, pp. S57-S65.
Koninklijke Philips Electronics , N.V.
Lee Hwa C.
Lundin Thomas M.
Razavi Michael
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