A Wavelet Transform Based Method to Determine Depth of Anesthesia to Prevent Awareness during General Anesthesia

Figure 3

Different signals obtained during the calculation of entropy for high-BIS epoch. In this epoch, BIS indices are greater than 90.

(a) Typical epoch of recorded EEG

(b) BIS of recorded epoch

(c) Absolute of alpha band signal

(d) of (1-2) Hz delta subband

(e) of (2-3) Hz delta subband

(f) of (3-4) Hz delta subband

(g) of (1-2) Hz delta subband

(h) of (2-3) Hz delta subband

(i) of (3-4) Hz delta subband

(j) MS of (1-2) Hz delta subband

(k) MS of (2-3) Hz delta subband

(l) MS of (3-4) Hz delta subband

(m) Histogram of MS of (1-2) Hz delta subband

(n) Histogram of MS of (2-3) Hz delta subband

(o) Histogram of MS of (3-4) Hz delta subband