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Fig. 2. —Diagram shows receiver operating characteristic (ROC) values
achieved using small main portal vein diameter to predict hepatofugal flow in
main portal vein in patients with cirrhosis. Operating points achieved by
predicting hepatofugal flow when main portal vein diameter was less than 1 cm
are shown for observer 1 (x) and observer 2 (
). Note that at
appropriate operating points, this sign is highly specific for hepatofugal
flow. Area under ROC curve (Az) was 0.83 for observer 1
and 0.74 for observer 2.
