Fig. 1. Xsight lung tracking system. (A) Tracking. Before radiation delivery, Xsight lung tracking system starts to track the tumor. It will take about 5-10 minutes. (B) Beam on. If Xsight lung tracking system localized the tumor, delivery of radiation starts. (C) Beam off. If Xsight lung tracking system missed the tumor, delivery of radiation stops and the system re-tracks the location of tumor.
