On the use of pooled receiver operating characteristic curves in the evaluation of scintigrams

The assessment of simulated scintigraphic pictures by means of curves based on binary decisions of individual observers called pooled ROC-curves or pooled L-ROC-curves is presented. The technique of creating the curve is described. The examples of various processing techniques and the findings of various groups of observers are compared and discussed. The images of two IAEA simulated phantoms were used to perform the evaluation. The results indicate that the pooled L-ROC-curves may serve as a measure of image quality.