Before you can start treatment on this study, you will have "screening questions" to help the doctor decide if you are eligible to take part in this study. You will be asked to complete some questionnaires to find out if there is any reason why you would not be able to receive an MRI scan. The questionnaires will cover topics such as whether you have a pacemaker and what medications you may be taking. It should take about 10-15 minutes to complete the questionnaires.