Method to obtain object boundary information in limited-angle co

Details Method to obtain object boundary information in limited-angle co Method to obtain object boundary information in limited-angle co

1987-04-01

1989-12-19

Smith, Jerry

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36441313, 378901, G06K 946, G06F 1538

Patent

active

048886939

ABSTRACT:
A method is developed to construct the convex hull of an object in limited-angle x-ray computerized tomography. The convex hull is the smallest convex region containing the object, and therefore it can serve as a prior information on the object exterior boundary in reconstructing the object by an iterative limited-angle reconstruction procedure. The convex hull is the same as the exterior boundary of many convex objects and is a good approximation if the shape is not too concave. Greater accuracy is achieved by doing curve fitting near the edges of the x-ray projection data to determine the end points, and performing a low energy x-ray exposure at every scan angle in addition to the usual CT energy one. Over-attenuated x-ray data has utility in constructing the convex hull.

REFERENCES:
patent: 4506327 (1985-03-01), Tam
patent: 4672651 (1987-06-01), Horiba
Tam, K. C. and Perez-Mendez, V., "Tomographical Imaging with Limited-Angle Input", J. Opt. Soc. Am., 71 (May 1981) 582-592.

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