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[i]Today NASA uses CT scans to screen ASCANS for heart disease. CT scans are very useful in excluding heart disease for a number of years in younger patients with a low pretest probability of heart disease. CT scans are not, in my view, that great for higher risk groups or patients who have already been diagnosed with heart disease. Having said that I think it is very possible that Col. Irwin would have been found not qualified for duty when he joined the astronaut corps in 1966.[/i]
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