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Figure 7a. Occlusion of the superior vena cava. (a, b) Volume-rendered images obtained with different rendering parameters demonstrate the flexibility of volume rendering for visualization of the chest wall musculature, thoracic bone, and the superior vena cava, which is nearly occluded by a tumor. (c) MIP image obtained with thin-slab reconstruction also shows near-occlusion of the superior vena cava.