An MRI is a test that uses a magnetic field and pulses of radio wave energy to make pictures of the spine. In many cases, an MRI gives different information than an X-ray, an ultrasound, or a CT scan. An MRI also may show problems that cannot be seen with other imaging tests.
Note: A general discussion of the causes of the subprime mortgage crisis is included in Subprime mortgage crisis, Causes and Causes of the 2007â2012 global financial crisis. This article focuses on a subset of causes related to affordable housing policies, Fannie Mae and Freddie Mac and government regulation.
A view, from the southwest, of the Federal National Mortgage Association's (Fannie Mae's) Reston, Virginia facility. The Great Depression wrought havoc on the U.S. housing market. By 1933, an estimated 20 to 25% of the nation's outstanding mortgage debt was in default. Fannie Mae was established in 1938 by amendments to the National Housing Act as part of Franklin Delano Roosevelt's New Deal.