Providence Tarzana Medical Center on Friday became the first. hospital in the nation to use the latest generation in imaging - the Ziehm Vision RFD - in this case to aid a surgeon in opening the clogged carotid artery of a patient who had suffered a small stroke. Zahi E. Nassoura, a board-certified vascular surgeon and chief of staff at Tarzana, liked what he saw in the crystal-clear image provided by the Ziehm Vision, approved late last month by the U.S.