Brain electrical impedance magnetic induction multi-frequency imaging data pre-processing method

The invention discloses a brain electrical impedance magnetic induction multi-frequency imaging data pre-processing method, and the method comprises the following steps: acquiring mutual inductance data corresponding to each frequency, acquiring frequency difference data before algorithm processing, arranging the frequency difference data according to relative antenna positions, acquiring a trend signal of the frequency difference data of a receiving antenna corresponding to each transmitting antenna, subtracting the trend signal, and restoring the data of which the trend signals are removed into an arrangement sequence of absolute antenna positions to obtain processed data. According to the invention, through a specific algorithm of extracting noise signals in mutual inductance data, noise signals with stronger signals in differential data are removed, so that weak characteristic signals can be highlighted in a value domain close to the weak characteristic signals. The frequency difference data is arranged a