Spectroscopic MRI Guided Proton Therapy in Assessing Metabolic Change in Pediatric Patients With Brain Tumors

Inclusion Criteria: * Pathologically diagnosed high-grade glioma (World Health Organization \[WHO\] grade 3-4). Patients with a radiographically diagnosed high-grade glioma may enroll prior to pathologic confirmation, but would be removed from study if pathology did not confirm the diagnosis of high-grade glioma. * Primary tumor located within the supratentorial brain. * Recommended to receive definitive radiation therapy. * Able to receive MRI scans. * Both males and females, and members of all races and ethnic groups are eligible for this trial. Exclusion Criteria: * Patients with pacemakers, non-titanium aneurysm clips, neurostimulators, cochlear implants, non-titanium metal in ocular structures, or other incompatible implants which makes MRI safety an issue are excluded. * Patients that have any significant medical illnesses that in the investigator's opinion cannot be adequately tolerate MRI scan are excluded. * Pathology demonstrated low-grade glioma or other benign or non-invasive brain tumor.