Fig. 2
From: Limited recurrence distance of glioblastoma under modern radiotherapy era
A, B case 1: example of local failure. The GTV (red line) showed the margin of primary tumor. The rGTV (green line) showed the local recurrent lesion, and the center of rGTV (green cross) is inside the GTV. C, D case 2: example of distant failure. The GTV (red line) showed the margin of primary tumor and the rGTV (green line) showed the distant recurrent lesion. The GTV + DT1 (blue line) was delineated to measure the distance between the GTV and the center of rGTV (green cross). In this patient, the distance was 2.9 cm