Fig. 2

A CT Scan of the QUASAR™ respiratory motion phantom with sternum removed to visualise the target. The target with fiducial markers is also shown more clearly; B Image of the phantom setup as used for treatment delivery; C An example of the reconstructed 3D dose distribution delivered to the lung insert during treatment delivery; D The lung insert used for treatment delivery, illustrating the alternating layers of air-equivalent material with the target embedded and Gafchromic EBT3 film for dose measurement