Illustrated reconstructed images with varying kVs on the slice number 10.

(a0): Image from the scanner. Red circles indicate ROI’s: ROI1, ROI2, ROI3 and ROIAIR. The red line is used to compute the LSF and MTF. Each row has reconstructed images at different kVs, (aj): 80kV, (bj): 100kV, (cj): 120kV, and (dj): 140 kV, for all j = 0 ⋯ 4. Each column has reconstructed images from different reconstruction algorithms: (X0): scanner, (X1): FDK, (X2): Katsevich, (X3): TV, and (X4): TF for all letters X = a, b, c or d.