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MTF data for nominal phantom thickness scans. (Left) MTF curve for the clinical head protocols for GE LightSpeed 16 slice and Varian OBI. The Elekta XVI HN S20 scan did not yield sufficient visualization of the MTF bead. Data points represent qualitative data, with the smallest visible line pair object given a MTF value of 10%, and the error bars representing half the increment of the line pair phantom. (Right) MTF curve for the clinical pelvis protocols for all three imaging systems.
