Fig. 6From: Evaluation of gantry speed on image quality and imaging dose for 4D cone-beam CT acquisitionCNR for CBCT-ave. All values were calculated over ten individual slices and then averaged. Error bars represent standard error. a CNR exhibits a linear trend as a function of gantry speed. (R2 = 0.988). b CNR normalized to the square root of mAs. Values were calculated over ten individual slices and then averaged. All error bars represent standard errorBack to article page