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Axial slice of an SBRT plan for a patient with a single lung metastasis from a colonic adenocarcinoma. He received 50 Gy in 5 fractions. The red contour is the internal target volume (ITV) and the orange contour is the planning target volume (PTV). The dark green line is the 50 Gy isodose line. The light green line represents the 25 Gy isodose line and the blue line represents 10 Gy. The brown structure is the liver and the magenta structure is the heart.
