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      The changes that have occurred in diagnostic radiology during the 2 decades that I have been a practicing radiologist are remarkable. Twenty years ago, angiography with rapid film changes and high-speed injectors of contrast material was the pinnacle of our technology. Tomographic techniques were available, but they simply involved film technology; computers had not had an appreciable influence on the imaging field. Most of our day-to-day activity included plain film work, gastrointestinal imaging with barium, and urinary tract studies with water-soluble contrast media. We were beginning to puncture the liver with needles for percutaneous transhepatic cholangiography. Ultrasonography was in its infancy and thus was used only minimally.
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