FIG 4.

Heat map of the 26 top-ranked features most frequently selected for classification of multi-institutional data on the basis of progression-free survival (PFS) according to scheme 2. The x-axis represents the PFS values for each of the patients, and the y-axis shows the radiomic features. ED, edema; ET, enhancing tumor; FLAIR, fluid-attenuated inversion recovery; GLCM, gray-level co-occurrence matrix; NC, nonenhancing core; SD, standard deviation; T2, TC, tumor core; TR, trace; WT, whole tumor.