METHOD OF SELECTING FREQUENCY OF INJECTED CURRENT FOR PERSONALIZING MONITORING BASED ON MULTI-FREQUENCY EIT Russian patent published in 2023 - IPC A61B5/536 

FIELD: medicine.

SUBSTANCE: invention relates to a method of selecting the frequency of injected current to personalize monitoring based on multi-frequency EIT. An electrode system is placed on the surface of the person’s chest. The current source is connected in series to the pairs of electrodes. A low-amplitude, high-frequency current is injected through the body of the person being studied. The potential difference between the electrodes over a time interval Δt at a given fixed frequency is calculated, then automatic switching to the next frequency in the range from f₁ to f_i in steps Δf for a given constant current parameter is performed. The change is reconstructed in the conductivity field Ω for each fixed frequency. Conductivity field values are averaged Ω_cf for each injected current frequency. All averaged conductivity field values are compared Ω_cf to determine the frequency of the injected current, starting from which the lowest rate of change in the average values of the conductivity field is observed Ω_cf The required frequency of the injected current is determined by the criterion of the minimum deviation of the average value of the conductivity field Ω_cf, which is calculated as the difference between the average values of the conductivity field Ω_avg, per time interval Δ t in the range from f₁ to f_i with step Δ f.

EFFECT: increase in the sensitivity of EIT method to visualization of the internal structures of the living biological object under study is achieved by comparing the average values of the reconstructed conductivity field according to the criterion of the minimum deviation of the average value of the reconstructed conductivity field for the entire frequency range and selecting the required frequency of the injected current.

1 cl, 2 dwg, 2 tbl