A method of determining an image data value at a point of reconstruction
in a computed tomography (CT) image of a scanned object, including
obtaining projection data of the scanned object, filtering the obtained
projection data with a one-dimensional ramp filter to generate
ramp-filtered data, and applying a backprojection operator with inverse
distance weighting to the ramp-filtered data to generate the image data
value at the point of reconstruction in the CT image.