Method and apparatus for correlating a body with an image of the

Details Method and apparatus for correlating a body with an image of the Method and apparatus for correlating a body with an image of the

1996-09-19

1999-09-14

Buiz, Michael

Surgery

Instruments

Stereotaxic device

1286531, A61B 600

Patent

active

059515716

ABSTRACT:
The present invention provides a system and process for correlating points on a spatial body to corresponding points on a data-base body formed from pre-acquired images of the spatial body. The system and process involves matching the spatial points with the corresponding data-base points using relative positional information between the spatial points and the data-base points. Symmetric false matches are detected and discarded by fitting the spatial points and data-base points to a first and second closed body, respectively, and comparing the orientation of the spatial points and the data-base points projected onto the closed bodies. In a preferred embodiment, the orientations of the spatial points and data-base points are compared by calculating, with respect to a matched spatial point, the longitudinal coordinates of the spatial points neighbouring the matched spatial point and calculating, with respect to the matched data-base point, the longitudinal co-ordinates of the data-base points neighbouring the matched data-base point, and comparing the difference in longitude between the points. If the difference in longitude of the spatial points corresponds to the difference in longitude of the data-base points, the match of the matched spatial point to the matched data-base point will be validated. Otherwise, the match will be considered a symmetric false match and discarded. Once at least three spatial points have been matched to corresponding data-base points, and the matches have been confirmed not to be false matches, a registration procedure is performed registering the spatial body to the data-base body by calculating a transformation mapping using the three matched pairs.

REFERENCES:
patent: 5230338 (1993-07-01), Allen et al.
patent: 5309913 (1994-05-01), Kormos et al.
patent: 5339812 (1994-08-01), Hardy et al.
patent: 5389101 (1995-02-01), Heilbrun et al.
H.H. Chen & T.S. Huang, `Maximal Matching of 3-D Points for Multiple-Object Motion Estimation`, Pattern Recognition vol. 21 No. 2, 1988.

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