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Turn the clock backward 40 years, and think for a moment of the changes that have occurred in diagnostic imaging. In the fifth decade of the century, the field did not even include digital-subtraction angiography, diagnostic ultrasonography, computed tomography (CT), or magnetic resonance imaging (MRI), let alone coronary arteriography and angioplasty. It was possible to write a textbook of radiology and expect that virtually all subjects could be covered adequately in a single volume.
But then humanity's capacity for creative thought and innovative problem-solving produced a series of extraordinary breakthroughs. Techniques that we had not even dreamed of were designed,
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