 determining, for each respective volume position in the reconstruction volume and for each respective 0D projection, respective two-dimensional in-plane coordinates by projecting the volume positions onto the projection plane defined by each of the respective 0D projections; determining, for each respective volume position in the reconstruction volume and for each respective 0D projection, a weighted contribution of each of the respective filtered 0D projections, wherein the determining of the weighted contributions includes evaluating the respective filtered 0D projections at the in-plane coordinates corresponding to the respective volume position