3D Printed Mask for GBM and Brain Mets

After patient is enrolled to the study, patients will have CT Sim. MR Sim (used to create 3D printed mask for intervention arm only) CT sim repeat (for intervention arm only) before start of radiation Patients will be asked to fill out a questionnaire after each CT Scan, and during the first and last week of radiation treatment

Patients will undergo standard of care simulation, planning and treatment with conventional workflow using thermoplastic mask.They will complete the tolerability questionnaire after CT-sim, and towards the end of the first and last week of treatment.