The cardiothoracic ratio aids in the detection of cardiomegaly, or more broadly, enlargement of the cardiac silhouette. It is measured on a PA chest x-ray, and is the ratio of:
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How Many People in the United States Have a Disability? An estimated 48.9 million people, or 19.4% of the non-institutionalized civilians, have a disability. An estimated 24.1 million people have a severe disability. An estimated 34.2 million people, or 17.5%, have a functional limitation.