An Investigational Scan (7T MRI) for the Imaging of Central Nervous System Tumors

PRIMARY OBJECTIVE: I. To estimate the contrast-to-noise ratio (CNR) for several imaging modalities in brain malignancy as compared with normal brain parenchyma separately by type of malignancy and treatment status. SECONDARY OBJECTIVE: I. To assess the conspicuity of each imaging modality to differentiate radiation necrosis from progressive disease. EXPLORATORY OBJECTIVES: I. To assess patient experience in the 7 Tesla (7T) magnetic resonance imaging (MRI) system compared to their most recent MRI examination. II. To assess the typical significance values seen for areas of maximal brain activity associated with each functional MRI (fMRI) test. III. To assess the geometric distortion of a radiation planning sequence on a ultra-high field (UHF) system. OUTLINE: Patients undergo 7T MRI over 60 minutes.