1. A computer-implemented method, comprising: receiving, by a computing system, a plurality of x-ray shots from an x-ray detector and position information from at least one positioning system, the plurality of x-ray shots comprising detector pixels; forming a matrix, by the computing system, relating voxels to detector pixels for each of the plurality of x-ray shots, wherein the matrix is formed to reduce or eliminate volume image artifacts; performing masking or recombination, by the computing system, to remove the detector pixels that are not part of a region of interest (ROI) or lump these detector pixels together as one or more unknowns; performing algebraic reconstruction technique (ART)-based reconstruction with regularization, by the computing system, to produce a three-dimensional (3D) volume image; and rendering and outputting the 3D volume image, by the computing system.