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Figure 5: Bar graph shows the effect of dose level on the detection of microcalcifications and the detection and discrimination of malignant and benign masses. Data correspond to averages for all observers, with standard errors (error bars) calculated in a fashion similar to the manner in which data were calculated in Figure 4. With the reduction from a full dose to a quarter dose, there was a significant decrease in microcalcification detection (P < .01) and mass discrimination (P < .05). Detection of malignant masses was reduced only with a quarter dose, and detection of benign masses changed little when radiation dose was reduced.
