forensic specialist dr michelle tully uses computed tomography scans or c.t. scans to help determine what happened in syria every cadaver link to a police investigation is scanned and in this case police a puzzled. we get this i suspect says he thinks the victim pulled a gun 1st and then he pulled a gun but that seems at odds with the location of the entry one of the state's matches at the back of the victim's head not the front so we're trying to find out what really happened to. this. the procedure is called of a topsy a virtual autopsy a c.t. scan shows a body's bones blood vessels and soft tissues it combines a series of x. rays taken from different angles into cross-sectional images or slices each slice is no sicker than a page dr tally finds the bullet in just a few seconds don't seem to hear form that you can see the nose here in front again you hear the eyes are up here and this is the brain isn't that i ski and if we move upward a little be see that this area of the brain shows evidence of bleeding again and that's where the bullet is over here in d.c