Using Xe MRI to Guide Radiation Therapy for Lung Cancer

This study is using xenon gas MRI — a special type of breathing scan — to take detailed images of how air moves inside the lungs. The goal is to use this information to plan more precise radiation therapy for lung cancer, protecting healthy lung tissue while targeting the tumour. **You may be eligible if...** - You are between 18 and 80 years old - You have a confirmed diagnosis of lung cancer and are scheduled for stereotactic body radiation therapy (SBRT — a highly targeted form of radiation) - You are able to give informed consent and attend the required visits **You may NOT be eligible if...** - You are under 18 or are incarcerated - You have a medical device or condition that makes MRI unsafe (based on standard MRI screening questions) - You are unable to hold your breath briefly as required for the xenon gas scan Talk to your doctor to see if this trial is right for you.