- The technical phase (discontinued) will recruit controls in order to define best MR parameters and pulse sequence to be used for optimal ADC signal detection for which we request permission to recruit up to 20 healthy volunteers. Technical Developmental Phase: Each participant will have a set of MRI scans at the following two times of day: the 1st between 11:00 AM and 1:00 PM (noon) and the second between 6:00 PM and 8:00 PM (evening).