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Comparison of stereotactic body radiation therapy (SBRT) plan in the left panel versus historical postage stamp anterior/posterior-directed field arrangements shown in the right panel. The SBRT plan uses advanced imaging and guidance to reduce the necessary margin around the tumor. In addition, it spares the high-dose (60 Gy, yellow) and intermediate-dose (30 Gy, green) volumes in exchange for a considerably larger low-dose (10 Gy, orange) volume.
