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Fig. 3. —Bar graph shows positive and negative predictive values for three human observers as well as those for network ANN_LSEG in predicting presence or absence of emboli in left lung. Positive predictive values in left lung are generally lower than are those in right lung for both human observers and network, although network and observer performance is comparable overall. ANN_LSEG = networks trained on left-lung data using only cases without emboli or with acute segmental emboli, black bars = positive predictive value, white bars = negative predictive value.