Unexplained weight loss is defined as the unintentional loss of at least 10 pounds or 5 percent of body weight over a period of 6 to 12 months. This would be equivalent to a 200-pound man losing 10 pounds or a 130-pound woman losing six to seven pounds.
What It Is. Magnetic resonance imaging (MRI) of the brain is a safe and painless test that uses a magnetic field and radio waves to produce detailed images of the brain and the brain stem. An MRI differs from a CAT scan (also called a CT scan or a computed axial tomography scan) because it does not use radiation.
MRI (High-Field, Non-Claustrophobic) What is Magnetic Resonance Imaging (MRI)? Magnetic resonance imaging (MRI) is a technique that allows doctors to see inside the body in remarkable detail without using radiation. Instead, MRI uses a powerful magnet, radio waves, and a sophisticated computer system to produce pictures of various parts of the body. All Metro Imaging facilities feature high-field, non-claustrophobic MRI units.