Fig. 3From: An investigation into the range dependence of target delineation strategies for stereotactic lung radiotherapyPhantom tumor movement along the superior-inferior direction as viewed in the frontal plane. The red, cyan and magenta contours represent the GTV, ITV, and PTV, respectively. For target ranges from 1 to 4 cm (left to right), the PTV is derived via (a) 10 phase “gold standard,” (b) free breathing, (c) augmented FB, (d) average intensity projection, and (e) maximum intensity projection image setsBack to article page