Real-Time Detection of Hemothorax and Monitoring its Progression in a Piglet Model by Electrical Impedance Tomography: A Feasibility Study

Figure 6

Separation of respiration and blood injection by filtering. (a) Raw EIT images during inhalation when using the data at the end of exhalation as the reference frame, raw total boundary voltage (TBV) during blood injection, and raw power spectra. (b) EIT images, TBV, and power spectra corresponding to blood injection obtained through a 4th-order low-pass Butterworth filter with a cutoff frequency of 0.15 Hz. (c) TBV and power spectra corresponding to respiration obtained by subtracting TBV caused by blood injection from the raw TBV.

(a)

(b)

(c)