Abstract: A method and system for computed tomography. Data is collected along a circular trajectory of an x-ray source. Data missing from the circular data is approximated. This may be accomplished by generating data that would have been collected along a line trajectory of the x-ray source. The image is reconstructed using the circle data and the approximated data. The circle views may be reconstructed from the circle data using a conventional Feldkamp reconstruction while the line data that would have been collected may be reconstructed as a correction to the Feldkamp reconstruction. The correction may be made by image addition, by adding the pixel values of the images reconstructed from the circle data and the approximated line data.

Abstract: A method and system for the correction of artifacts in computed tomography ages. Artifacts may occur at a crossover channel in computed tomography images. Sets of interpolation data about the crossover channel and extended interpolation data are generated as extensions of the interpolation data. The extended interpolation data overlaps with a portion of the interpolation data. The overlapping portion includes the crossover channel where the artifact may occur. The overlapping portion is determined by threshold channels which may be automatically selected by the system according to the invention. In this overlapping portion, feathering weights are applied to the interpolated data and the extended interpolated data. New data values are defined to using the feathering weights which eliminate the crossover artifact and produce continuous data. The feathering weights are chosen to meet certain criteria.

Abstract: A computed tomography method and system where a voxel of a subject irradiated with x-rays is divided into an plurality of sub-voxels, and backprojection data is obtained for the sub-voxels. Projection data for the sub-voxels can be weighted before backprojecting, or the projection data can be backprojected and then weighted. With the method according to the invention, instead of backprojecting data on a straight line passing through the center of a voxel, the beam passing through the entire voxel is backprojected. Also, the method and system weights the sub-voxels using a space-variant function. The weighting can be applied to discrete sub-voxels or integration can be used with infinitely thin sub-voxels. The present invention is a more accurate method and can take into account of spreading of the x-ray beam.