Fig. 4.

Spectral reconstruction results from noise-free truncated projections. The top and bottom rows are for the images reconstructed by the StTV and AdSA, respectively. The images in the first three columns, from left to right, are for the 1^st, 4^th and 8^th channels, respectively, and the display windows are [0 1], [0 0.5] and [0 0.3] cm⁻¹, respectively. The last column shows the corresponding material decomposition results. The circles indicate the ROIs.