Fig. 14.

Results for realistic abdomen images evaluation. (a) Raw projection obtained by forward projecting the 100-kV CT image. (b) Estimated projection obtained using the estimated 100-kV spectrum. (c) Line profiles comparison of the raw projection and the estimated projection. (d) The estimated spectrum and the initial spectrum used in the optimization problem. Note that true spectrum is not available in this case and the estimated spectrum should be an effective spectrum, which takes the system configuration and postprocessing algorithms into account.