This is the virtual reality preparation app for children who get an MRI examination. In this app you can look around in an MRI room and you will receive more information about the research. You can also experience what it is like to lie in the MRI. The app was developed by the departments of Child and Adolescent Psychiatry and Radiology at Erasmus MC. Currently, the app can only be used by children who participate in scientific research at Erasmus MC and Amsterdam UMC. Children who participate receive a code for this. We hope to make this app available to everyone after completing the research.