摘要：We study the local region-of-interest (ROI) reconstruction
problem, also referred to as the local CT problem. Our scheme
includes two steps: (a) the local truncated normal-dose
projections are extended to global dataset by combining a few
global low-dose projections; (b) the ROI are reconstructed by
either the generalized filtered backprojection (FBP) or
backprojection-filtration (BPF) algorithms. The simulation results
show that both the FBP and BPF algorithms can reconstruct
satisfactory results with image quality in the ROI comparable to
that of the corresponding global CT reconstruction.
