Surgery – Truss – Pad
Patent
1992-05-21
1994-04-19
Cohen, Lee S.
Surgery
Truss
Pad
36441315, 36441316, 36441318, 36441319, 324306, A61B 5055
Patent
active
053037065
ABSTRACT:
The staircase artifact appearing in Magnetic Resonance Angiography boundaries between flowing blood and stationary tissue is eliminated by using a variable local interpolation direction which is determined based on comparing local intensity patterns. This technique of local directional interpolation is applied either to a three dimensional array of voxels prior to projection or to a two dimensional array of pixels after projection. In the case of interpolating lines of further pixels between consecutive lines of original pixels, a window of n.sub.1 pixels in a present line is compared to successive groups of n.sub.1 pixels in a search window of n.sub.2 .gtoreq.n.sub.1 pixels which groups are successively shifted in position in the search window. A match measure is formed by either a correlation or a root mean squared error (or a combination thereof) between the window and groups compared. The best match with respect to a threshold determines corresponding pixels. In the absence of a match better than the threshold a default vertical direction of interpolation is taken.
REFERENCES:
patent: 4827413 (1989-05-01), Baldwin et al.
patent: 4866612 (1989-09-01), Takagi et al.
patent: 4879652 (1989-11-01), Nowak
patent: 4894776 (1990-01-01), Dekel
patent: 4907152 (1990-03-01), Lempriere
patent: 4953087 (1990-08-01), Crawford
patent: 4985834 (1991-01-01), Cline et al.
patent: 5031226 (1991-07-01), Delange
patent: 5079699 (1992-01-01), Tuy et al.
patent: 5148499 (1992-09-01), Matsumura
patent: 5167232 (1992-12-01), Parker et al.
patent: 5187660 (1993-02-01), Civanlar et al.
"Volume Rendering and Connectivity Algorithms for MR Angiography", by Harvey E. Cline et al, Magnetic Resonance in Medicine 18, pp. 384-394.
"MR Angiography Based on Inflow", by J. P. Groen et al, Philips Medical Systems, Best, The Netherlands, p. 906.
"Shape-based Interpolation", by Gabor T. Herman et al, University of Pennsylvania, May 1992, pp. 69-79.
"Shape-Based Interpolation of Multidimensional Objects", by Sai Prasad Raya et al, IEEE Transactions on Medical Imaging, vol. 9, No. 1, Mar. 1990, pp. 32-42.
"Dynamic Elastic Interpolation for 3-D Medical Image Reconstruction From Serial Cross Sections", by Wei-Chung Lin et al., IEEE Transactions on Medical Imaging, vol. 7, No. 3, Sep., 1988, pp. 225-232.
"Restoring Spline Interpolation of CT Images", by Chin-Hwa Lee, IEEE Transactions on Medical Imaging, vol. M1-2, No 3, Sep. 1983, pp. 142-150.
"Model Guided Automatic Frame-to-Frame Segmentation in Digital Subtraction Angiography", by J. H. Rong et al, Proc. SPIE-The International Society for Optical Engineering, vol. 1137, pp. 31-36 (1989).
Casler Brian L.
Cohen Lee S.
North American Philips Corporation
Slobod Jack D.
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