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uring the last several years, dramatic developD ments have taken place in the area of cardiac imaging techniques. From an era of imaging by silhouettes (chest roentgenography, fluoroscopy, angiocardiography, angiography), we have emerged into an era of imaging by tomographic scanning (echocardiography, radionuclide and computed tomography, magnetic resonance).l-3 Two-dimensional intravascular e...