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Mean CT number, noise, and SNR for low-density pellets of classified artifacts as a function of the reconstructed images, i.e., VMI without (90, 110, 130) and with the MARS algorithm (90+M, 110+M, and 130+M). The values for mild low, mild up, and severe artifact are reported with yellow, green, and red lines, respectively. The reference values are indicated with a blue line.
