Inclusion Criteria:  An adult patient with pathology-proven solid organ cancer MRI of the brain with contrast, positive for at least one intra-axial metastatic lesion greater than 5 mm Planned treatment with stereotactic radiation  Exclusion Criteria:  Contraindication to MR imaging Known allergy to gadolinium-based contrast agents Renal failure as defined by a glomerular filtration rate (GFR) less than 30 or the use of hemodialysis Pregnant Patients less than 18 years of age will be excluded