Fig 3.

Summary hierarchic ROC curves of imaging techniques. Estimated summary ROC curves are plotted by imaging technique in ROC space for diffuse gliomas as a whole—that is, low- and high-grade gliomas combined (A), low-grade glioma (B), and high-grade glioma (C). The operating points of curves represent the estimated summary true-positive and false-positive rates as indicated by solid squares. Solid squares are missing when convergence is not reached. Color coding shows conventional MR imaging in black, advanced MR imaging in shades of blue, PET imaging in shades of red, and CT and sonography imaging in shades of green.