Diagnosis method for use with living biological tissue in which local permittivities are measured using a high frequency probe in a balanced bridge circuit, e.g. for tumor diagnosis

摘要

Method in which the complex impedance of tissue in the high frequency region is measured local to the tip of an open coaxial probe, while a reference probe is brought into contact with a reference dielectric. The two probes form two arms of a bridge circuit. Probe voltage outputs are measured in the time domain, stored in a computer and converted, using a Fourier transform, into the frequency domain. The quotient of the complex amplitudes of bridge and supply voltages are displayed on a monitor or a neural network for diagnostic comparison with earlier data. The invention also relates to a corresponding arrangement for executing the method.