Figure 1
From: Pneumomediastinum as a complication of SABR for lung metastases
A combination set of three CT scans obtained during free breathing (pink), deep inspiration (yellow) and deep expiration (blue) were used to generate an internal target volume (ITV) that accounts for respiratory motion (red). The blue dots outline the lung structure and the red dots indicate the radiation target. Digital Reconstructed Radiography (DRR) show the trachea (blue) and bronchial tree (yellow) structure and the targets volumenes (the lung nodule (green), and the PTV (dark blue) included the ITV (red) with a symmetric 0.5 cm margin.