fig1

Figure 1. Stereotactic ablative radiotherapy (SABR) dose distribution and post-treatment tumor response. Top left shows an example of SABR tumor and dose distribution. The image is an axial view of the planning target volume (red) with planned dose distribution extending from the interior (orange isodose line, 105% of prescribed dose) to the periphery (purple isodose line, 30% of prescribed dose) of the tumor. The bottom left image shows the same tumor on positron emission tomography (PET) computed tomography (CT) prior to SABR, with high avidity within the tumor volume. The bottom middle shows the same tumor on PET 6 months after treatment, with resolution of PET avidity. The bottom right shows the same tumor on CT 12 months after treatment, with tissue necrosis in the previously treated volume