Systems, methods and apparatus are provided through which in one aspect, a
three-dimensional (3D) image of an object is constructed from a plurality
of two-dimensional (2D) images of the object using a specialized filter.
In some embodiments, the specialized filter implements a linear ramp
function, a windowing function, and/or a polynomial function. In some
embodiments, the 3D image is back-projected from the filtered
two-dimensional images, yielding a 3D image that has improved visual
distinction of overlapping anatomic structures and reduced blurring.