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.
The classic explanation of financial crises, going back hundreds of years, is that they are caused by excesses â frequently monetary excesses â that lead to a boom and an inevitable bust. In the recent crisis we had a housing boom and bust, which in turn led to financial turmoil in the United States and other countries.