Fig. 1From: Stereotactic ablative radiotherapy for ultra-central lung tumors: prioritize target coverage or organs at risk?An illustrative example of a contoured ultra-central lung tumor case. The relative locations of tumor and OAR are indicated; IGTV (red), PTV (blue), proximal bronchial tree (yellow), esophagus (green), heart (maroon), and healthy lung (cyan). Here, the PTV volume is 83.1 cm3 and 2.2 cm3 overlap with the proximal bronchial treeBack to article page