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Figure 2: Cross-sectional views of a representative patient's volumetric-modulated arc therapy-based stereotactic body radiation therapy plan showing seven 5 mm wide rings generated concentric with the PTV surface. Also seen is the ring terminator with 1 cm gap from the superior and inferior extremes of the PTV surface

Figure 2: Cross-sectional views of a representative patient's volumetric-modulated arc therapy-based stereotactic body radiation therapy plan showing seven 5 mm wide rings generated concentric with the PTV surface. Also seen is the ring terminator with 1 cm gap from the superior and inferior extremes of the PTV surface