predestination - previous determination as if by destiny or fate. doom, doomsday, end of the world, day of reckoning - an unpleasant or disastrous destiny; everyone was aware of the approaching doom but was helpless to avoid it; that's unfortunate but it isn't the end of the world.
That is 2 1/2 hours! Average is 3 hours now from start to finish. THEN we have to wait for the scan to be sent to the radiologist, and when he/she calls back, we can dispo the patient. I can't believe that every CT done in this country for a possible appy or whatever takes over 3 hours.
edit Principle and Procedure. A CT scan relies on a series of X-rays and is usually completed within 5-10 minutes. On the other hand, a PET scan takes anywhere between 2 to 4 hours. The basic principle behind a CT scan relies on the reconstruction of a three dimensional image of an organ, by a computer.