FIG 1.

ROC curves for the performance of PET/MR imaging–based NI-RADS for discriminating treatment failure or no treatment failure. Blue curves reflect the performance of PET/MR imaging for the primary site, neck lymph nodes, and all sites combined. Inflection points in the curves are discrimination points between NI-RADS 1 and 2 and 2 and 3. The red diagonal curve is a reference. The AUC is reported for each curve, with values >0.500 signifying good performance of the test to discriminate treatment failure.