Quasi-Stationarity of EEG for Intraoperative Monitoring during Spinal Surgeries

Figure 3

Diagram for “eigenspace filtering”. (a) Algorithm flowchart for eigenspace filtering. (b) Set of 𝑥_𝑘(𝑡) signals from Figure 1(b) before eigen filtering. (c) Set of 𝑥𝑟_𝑘(𝑡) signals after filtering with the extracted SSEP signal, 𝑠(𝑡), shown by dotted line superimposed on the signals for easy comparison.