Patent ID: 8644549
Filing Date: 2014-02-04
Classification: G06T

Abstract:
1. A computer-implemented method for deriving a full-volume volumetric image of an object being imaged, the method comprising: calculating a first volumetric image of the object using a direct reconstruction method from a plurality of radiation measurements of the object taken from a plurality of directions, wherein calculating the first volumetric image comprises calculating a value for each voxel in the first volumetric image; and performing at least one iteration of a nonregulating iterative reconstruction method to compute a second volumetric image of the object, wherein the iterative reconstruction method is initialized with the first volumetric image of the object, wherein the second volumetric image comprises a corresponding voxel for each voxel in the first volumetric image, and wherein performing the at least one iteration comprises calculating a value for each voxel in the second volumetric image, wherein the iterative reconstruction method comprises ordered subset maximum likelihood, algebraic reconstruction technique, simultaneous algebraic reconstruction technique, simultaneous iterative reconstruction technique, least-squares QR method, expectation maximization, ordered subset convex method, or ordered subset expectation maximization, and wherein the plurality of radiation measurements does not satisfy a volumetric reconstruction requirement.