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The subject stands in the scanner while a obese detector ring passes down the body obese (see graphic). At the same time, eight electrical coils also mounted on the ring generate a radio-frequency electromagnetic field. As the energy passes through the body, the field's phase is shifted, depending on the obese conductivity of the tissue, and hence its water content. Eight detector coils record any shifts in the field's phase for each body slice. At the same time, four lasers sweep across the body. The reflected light is picked up by four digital cameras which build up an extremely high-resolution image of the subject's shape. Combining body volume with water content for successive slices allows the system to calculate fat content in each slice and so tell the subject very accurately where they are piling on the pounds. A long-term goal for the team, who this week presented their system at a conference on Industrial Process Tomography in Banff, Canada, will be detecting illnesses, such as liver disease, which result in excess water retention by the body.
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