Figure 3.

Images reconstructed using noiseless computer simulated data. (First column) Conventional convolution backprojection reconstruction. (Second column) Proposed noise-weighted FBP reconstruction with spatial-domain filtering using ray-by-ray weighting. (Third column) Noise-weighted FBP reconstruction with spatial-domain filtering using view-by-view weighting. (First row) Display with a full gray-scale from minimum to maximum for each image. (Second row) Line profiles along the horizontal small dots. (Third row) Line profiles along the vertical small dots.