Like CT scans, MRI scans provide detailed images of soft tissues. But MRI scans use radio waves and strong magnets instead of X-rays. MRI scans are most often used to look for possible spread of lung cancer to the brain or spinal cord.12
12. ACS. Tests for Non-Small Cell Lung Cancer. Available at: https://www.cancer.org/cancer/non-small-cell-lung-cancer/detection-diagnosis-staging/how-diagnosed.html. Accessed 2: May 2019.