Do I have to lie still when I have an MRI?

Yes. In order to achieve the best imaging results it is important to minimize movement. You should remain relaxed and as still as possible. Because a scanning session will often include a series of individual scans, you will probably be given the opportunity to find a more comfortable position between scans. If you find that you are uncomfortable in any way, the attending MRI technologist will help you find a position in which you can rest comfortably.