Workflow of radiology procedures process. The turnaround time, TAT, is defined as the sum of the time that elapses between an imaging examination is ordered and executed. The transfer time, TT, is the time to deliver images and referral to the clinical units. In a fully integrated digital environment images and referrals are immediately available to the ward (TT = 0). In an analogue one, film and paper printed reports need to be physically carried from Radiology to the ordering clinical or surgical unit.