FIELD: medicine. SUBSTANCE: when diagnosing disease of sinus, electromagnetic field is excited by means of removable eddy-current converter connected into circuit of harmonic oscillation generator. The converter is laid on intact part of face surface of patient and value of change in generator frequency is fixed. Due to changing phase shift in the circuit of harmonic oscillation generator, the value of frequency difference should be equal to zero. After that eddy-current converter is put on surface of sinus under test and pathology of sinus may be judged from value of change in frequency increment. EFFECT: improved precision; improved efficiency. 3 dwg
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