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:
Disability around the World: It's estimated that more than 1 billion people live with a disability. (United Nations, 2013) This represents the worldâs largest minority, and the only minority group that any of us can become a member of at any time.
How Many People Have Ever Lived on Earth? http://www.prb.org/Publications/Articles/2002/HowManyPeopleHaveEv... 2 of 3 8/6/2015 9:36 AM By 1 A.D., the world may have held about 300 million people.