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Fig. 1B —Effect of simulated dose. Graphs show effect of simulated dose on diagnostic certainty (A) and image quality (B). For particular level of simulated dose, bars represent proportion of patients at each subjective reader score for diagnostic certainty (pulmonary embolus vs no pulmonary embolus) and image quality. Proportions are average of four readers. Brackets represent significantly different distributions between groups (asterisk, p < 0.02, pound sign, p <0.01).