RealMove (Lung): Assessing Tumour Motion With Dynamic MRI

This study is looking at using a type of MRI scan that captures movement (called dynamic MRI) to more precisely measure how lung tumors shift during breathing. This information could help radiation therapists plan more accurate treatments that better protect healthy tissue around the tumor. **You may be eligible if:** - You have been approved for a type of focused radiation treatment (SBRT) for one or more lung tumors (either lung cancer or cancer that has spread to the lung) located in the lower portion of the lung - You are 18 years or older - You are physically able to lie still in a fixed position for at least 30 minutes - You have adequate Swedish language skills and cognitive ability to complete study materials **You may NOT be eligible if:** - You are pregnant, breastfeeding, or planning pregnancy during your treatment - You have a contraindication to MRI (such as certain metal implants) - You are otherwise unable to participate in the study Talk to your doctor to see if this trial is right for you.