Method to reduce image reconstruction time in limited-angle CT s

Details Method to reduce image reconstruction time in limited-angle CT s Method to reduce image reconstruction time in limited-angle CT s

1988-06-06

1991-10-01

Hayes, Gail O.

Boots, shoes, and leggings

36441319, G06F 1542

Patent

active

050539582

ABSTRACT:
To achieve a large reduction in the amount of computer time in limited-angle computerized tomography, the reconstructed image is decomposed into two partial images reconstructed from available scan data and missing scan data. Because the former is unchanged during the interative image reconstruction procedure, it is reconstructed from the measured projections only once at the beginning of the iterations and used repeatedly. The composite image formed by summing the two partial images is corrected by the a priori information about the object. The improved partial image due to missing projections is calculated and again summed with the partial image due to measured projections and corrected. These steps are iteratively repeated until a test for convergence yields a final image. A limited-angle x-ray CT system utilizes the projection space version of the iterative transform algorithm.

REFERENCES:
patent: 4506327 (1985-03-01), Tam
patent: 4866614 (1989-09-01), Tam
patent: 4888693 (1989-12-01), Tam
patent: 4922421 (1990-05-01), Tam
K. C. Tam and V. Perez-Mendez, "Tomographical Imaging with Limited-Angle Input", J. Opt. Soc. Am., 71, May 1981, 582-592.
K. C. Tam and V. Perez-Mendez, "Improved Gated Cardiac Scanning Using Limited-Angle Reconstruction Technique", IEEE Trans. Nucl. Sci., NS-30, Feb. 1983, 681-685.
K. C. Tam, "The Use of Convex Hulls in Limited-Angle Computerized Tomography", TIS Report No. 88CRD006, Feb. 1988, General Electric Co., Corporate Research and Development, P.O. Box 8, Schenectady, NY 12301.
K. C. Tam, "Comparison of Three Methods in Limited-Angle Image Reconstructions", TIS Report No. 87CRD212, Nov. 1987, General Electric Co., Corporate Research and Development, P.O. Box 8, Schenectady, NY 12301.

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