Irradiation of mouse thorax using the SARRP. Panel A: Whole thorax irradiation jig and beam arrangement. Panel B: Radial arrangement of mice on platform. Panel C: Lead shielding of head area and upper extremities. Panel D: Lateral radiograph of mouse on the SARRP platform using thoracic irradiation jig. Mice were irradiated using the SARRP, to deliver single fraction 13.5 Gy X-ray irradiation to the thorax. Shielding was provided for the head only as the highly collimated field edge already limits dose to the abdomen/pelvis. The red shaded area represents the radiation field.