How does the EchoMRI™ system work to measure fat, lean, and free water?
A. In general, NMR instruments create contrast between soft tissues by taking advantage of the differences in relaxation times of the hydrogen spins and/or hydrogen density in these tissues. Radio frequency signals are generated by hydrogen nuclei due to precession of the spin axes. The amplitude, duration, and spatial distribution of these radio frequency signals are related to properties of the material investigated by the NMR technique. Tissue contrast is high between fat, body free fluid, and muscle based on NMR signal amplitude and relaxation times, and can be further enhanced by application of certain radio frequency sequences.
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