Locally advanced NSCLC has a poor prognosis with a 5 year overall survival rate of only 15%. Tumour hypoxia may impact the ability to control NSCLC. Using 18F-FAZA PET, this study will assess patients for hypoxic treatment. With this information, we can start individualizing patient treatment to target hypoxia. The relationship between areas of hypoxia (18F-FAZA) and high glucose utilization (18F-FDG) will also be assessed.