After the radiation therapy, you will have an MRI or a CT scan of the brain every 6 months for 1 year and then every year for 5 years to check the status of the disease. More frequent scans will be performed if your doctor thinks they are needed. You will also complete a written mental status exam with your doctor every 3-6 months for 2 years and then every year for 5 years. The exam will have a series of tests to check your memory and ability to follow instructions. The test will take about 15 minutes to complete.