FIGURE 1. Fused PET/CT images of patient with T4 N2 M0, stage IIIB NSCLC. Patient has 2 primary lesions in right lower lobe (best seen in C) with adenopathy in subcarinal (A) and right paratracheal regions (B). PET and CT images were coregistered with aid of fiducial markers, 1 of which is shown in A. (D) Beam arrangement used to cover biologic target volume.