Figure 4From: Geographic miss of lung tumours due to respiratory motion: a comparison of 3D vs 4D PET/CT defined target volumesA CT scan of a patient with a small lower lobe tumour. The 4D-PTV is shown in red and the green area show the 95% isodose line. The solid red area is the part of the 4D-PTV that would not receive the prescribed dose and constitutes a Type 3 geographic miss.Back to article page