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Figure 2: Representative axial (A) and coronal (B) views of a corresponding contoured 16 × 1.5 mm detector-derived GTV16, 4 × 1.5 mm detector-derived GTV4, four-dimensional computed tomography-derived internal gross tumor volume, and active breath controlled technique-derived GTVabcof one patient. Internal gross tumor volume was notably larger than any other GTVs. GTV=Gross tumor volume

Figure 2: Representative axial (A) and coronal (B) views of a corresponding contoured 16 × 1.5 mm detector-derived GTV<sub>16</sub>, 4 × 1.5 mm detector-derived GTV<sub>4</sub>, four-dimensional computed tomography-derived internal gross tumor volume, and active breath controlled technique-derived GTV<sub>abc</sub>of one patient. Internal gross tumor volume was notably larger than any other GTVs. GTV=Gross tumor volume