Recruitment {15}
Any child aged 6 months to 6 years who will need a scheduled MRI in the one-day clinic of our institution will be screened during the preoperative visit. During the consultation, the anesthesiologist will explain the MIDEX MRI trial and answer to the questions of the parents or the legal representative if needed. The informed consent will be obtained by the anesthesiologist during the preoperative consultation or a member of the unblinded study team on the day of the sedation.