Magnetic Resonance (MR) Imaging to Determine High Risk Areas in Patients With Malignant Gliomas and to Design Potential Radiation Plans and to Examine Metabolite Changes in Gliomas and Other Solid Tumors

This study is using advanced MRI imaging to identify which areas of a brain tumor are most likely to regrow after radiation therapy, so that radiation treatment can be more precisely targeted. **You may be eligible if...** - You are 18 or older - You have a suspected or confirmed high-grade or low-grade brain tumor (glioma), or a tumor suspected to have a specific genetic change (IDH mutation) - You may be planning to undergo radiation therapy - You or your guardian can provide written consent **You may NOT be eligible if...** - You have severe claustrophobia that prevents you from having an MRI - You have a known allergy to gadolinium contrast dye (used in MRI) - You have a pacemaker, aneurysm clip, or other metal implant incompatible with MRI - You are pregnant or nursing - You cannot cooperate for MRI or radiation therapy planning Talk to your doctor to see if this trial is right for you.