Metabolic Characteristics of Brain Tumors Using Hyperpolarized Carbon-13 Magnetic Resonance Spectroscopic Imaging (MRSI)

This study uses a special type of MRI scan with a carbon-13 tracer to measure how brain tumor cells use energy (metabolism), which can help doctors better distinguish tumors from normal brain tissue and monitor how well treatment is working. **You may be eligible if...** - You are between 18 and 70 years old - You have been diagnosed with a brain tumor (such as glioma, meningioma, or brain metastases) confirmed by imaging - You have not yet started chemotherapy or radiation therapy for this tumor - You are able to read and speak English - Women of childbearing age must agree to use contraception **You may NOT be eligible if...** - You are currently enrolled in another experimental study - You have previously received radiation or chemotherapy for a brain tumor - You have uncontrolled chronic diseases (such as high blood pressure, diabetes, heart failure, or active infection) - You have a history of alcohol abuse or illicit drug use - You are pregnant or breastfeeding - You have conditions that prevent MRI scanning (such as a pacemaker, certain implants, severe claustrophobia, or serious kidney disease) Talk to your doctor to see if this trial is right for you.