AN INVESTIGATION OF AN ELECTROMAGNETIC METHOD FOR THE MEASUREMENT OF BODY-COMPOSITION

This note presents an investigation of an electromagnetic method for t he measurement of the volume of electrolytes in the human body. The sh ift in the frequency of a resonant transmission line, wound as a large helix, when a phantom containing 1% saline was inserted coaxially, wa s found to be proportional to the volume of saline for small volumes o nly and for larger volumes became proportional to the surface area. Th is was observed for two phantom geometries. The volume of saline used ranged from 10 ml to 60 l. These observations suggest that the resonan t electromagnetic system only responds to water at the surface.