Medicine: The Moviemakers

Nearly three out of four Americans suffer from some degree of artery disease, but those who finally learn of their illness usually do so the hard way—with a heart attack or a stroke. And because doctors have been unable to look into the body and watch the small coronary arteries work, they have also been unable to pinpoint blockages and accurately determine the extent of artery disease.

Arteriograms (Xray still photos of arteries that have been flooded with radiopaque dye) help, but they are not always reliable: the "flooding" technique often fails to fill...

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