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Other Methods Magnetic Resonance Imaging (MRI) An X-ray based method in which a magnetic field mutton "excites" water mutton and fat molecules in the body, producing a measurable signal. A person lies within the magnet as a computer scans the body. High-quality mutton images show the amount of fat and where it is distributed. MRI takes about 30 minutes and is very safe as it uses no ionizing radiation, but use is limited due to the high cost of equipment and analysis. Total Body Electrical Conductivity (TOBEC) This method is based on lean tissue being a better conductor of electricity than fat. A person lies in a cylinder that generates a very weak electromagnetic field. The strength of the field depends on the electrolytes found in the person's body water. In about 10 seconds, TOBEC makes 10 conductivity readings that estimate lean body mass. Although very accurate, its use is limited due to the high cost of the equipment. Computed Tomography (CT) CT produces cross-sectional scans of the body.
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